DOCSLIB.ORG

STARDUST Newsletter of the Royal Astronomical Society of Canada Edmonton Centre

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
STARDUST Newsletter of the Royal Astronomical Society of Canada Edmonton Centre STARDUST Newsletter of the Royal Astronomical Society of Canada Edmonton Centre September 2008 Volume 54 Issue 1 Partial eclipse, from high above the tundra near Cambridge Bay, 1 August 2008. Photo by Krista Stefan. Inside this Issue Contact Information................................................................................................................................................page 2 Upcoming Events, Meetings, Deadlines, Announcements.....................................................................................page 3 Public Education Report.........................................................................................................................................page 3 International Year of Astronomy Committee Report.............................................................................................page 3 Letter to RASC Edmonton Centre..........................................................................................................................page 4 President's Report....................................................................................................................................................page 4 Observers Report.....................................................................................................................................................page 4 Eclipse.....................................................................................................................................................................page 8 Beaver Hills Dark Sky Preserve Report..................................................................................................................page 8 Magnetospheres in the Solar System......................................................................................................................page 9 Beating the Seeing Part 9........................................................................................................................................page 10 The Planets..............................................................................................................................................................page 13 Blotting Out Star Light...........................................................................................................................................page 14 Crescents and Full Moon Photo-Ops......................................................................................................................page 14 RASC Edmonton Centre September 2008 1 RASC Edmonton Centre Contact Information Council Positions President Krista Stefan Past-president Orla Aaquist Vice-president Sherry Campbell General Secretary Luca Vanzella Treasurer Mark MacDonald Co-National Council Rep Alister Ling Co-National Council Rep Patrick Earl Public Education Director (PED) Orla Aaquist Fund Raising Coordinator Franklin Loehde Councillor Bruce McCurdy Councillor Richard Vanderberg Councillor Sheldon Helbert Councillor Harris Christian Councillor Ross Sinclair Internal Communications Officer Michael Ward Observers© Group Director Paul Campbell Membership Secretary Massimo Torri New Member Advisor Murray Paulson Dark Sky Preserve Coordinator Sherrilyn Jahrig Light Pollution Chair Bruce McCurdy Appointed Officers Editor Michael Ward Web Site Coordinator Howard Gibbins Library Coordinator Roxy Garstad Equipment Coordinator Dwight Hanson Mailing address RASC Edmonton Centre c/o Telus World of Science 11212 – 142 St Edmonton, AB, Canada, TM5 4A1 Centre Website http://www.edmontonrasc.com Observing Deck 452-9100 ext 2249 Stardust Articles for Stardust may be submitted by email to [email protected]. Submission deadline is the last day of the previous month (e.g. for the May issue submit by 30 Apr). Submit as MSOffice 2003 or earlier (NOT MS xml/docx please) or OpenOffice OR AbiWord OR plain text. Please avoid use of fancy formatting, odd spacing, and strange fonts. Graphics (photographs, illustrations) should be submitted as separate files, and clearly identified. Edmonton Area Astronomy Discussions: [email protected] To subscribe send a blank email to: [email protected] with the subject line: subscribe The above mailing list is completely independent and is not associated with RASC Edmonton Centre in any way. RASC Edmonton Centre September 2008 2 Upcoming Events, Meetings, Deadlines, Announcements Regular Meetings 2008 Council Meetings 2008 Telus World of Science, 11211 - 142 St, 7:30pm ATA Building, 142 St & 111 Ave, 7:15pm Sep 8 Nov 10 Sep 22 Nov 24 Oct 20 Dec 8 Oct 27 GUEST SPEAKER, SEPTEMBER 2008 Robert Smith, Department of History and Classics, distance can be seen as if nearby.” In this talk, Robert Smith will University of Alberta, presents Remaking the Heavens: The discuss the telescope’s invention and the early history of its Invention and Early Use of the Telescope. In September 1608, application to astronomy on the (approximately!) four hundredth Hans Lippershey, a spectacle maker in the city of Middleburg in anniversary of its invention. In so doing he will pay particular the Dutch Republic, made the very first application for a patent attention to Galileo’s early telescopic researches. for “a certain device by means of which all things at a very great Expenditure Proposal Deadline: October 10, 2008. Proposals may be submitted to either Sherry Campbell or Krista Stefan. Electronic submissions via e-mail are preferable, but arrangements can also be made to submit a proposal in person or via regular post. Please see the contact information list in Stardust or the Edmonton Centre website (http://www.edmontonrasc.com/councilcontacts.html) to arrange for submission. Public Education Report by Orla Aaquist We ran four success full outreach events over the summer. The inflatable planetarium was handled entirely by Patrick Earl On June 8, Bruce McCurdy presented his talk on “50 years of and Cornelia Blunck for the entire afternoon. Space Science” to a class of about 20 students at McCauley On July 20 we spent 5 hours looking at the Sun in Churchill School, and on August 16, Warren Finlay gave an Astronomy Square as part of ‘Taste of Edmonton – Sunday in the City’. 101 talk to one hundred and forty Miquelon Lake Provincial Wayne Malkin and I set up our booth at 10 AM, Luca Vanzella Park campers followed by an observing session. These types of and Jay Lavender (and friend) volunteered for the first shift, and presentation are something that we want to have available for our Geoff Robertson and Peter Hall and his wife Ann volunteered for outreach programs, so if you have a public presentation that you the second shift. can present at some public function or activity, like a school As always, the Observing Deck continues to be our most visit, please let me know. active venue for our outreach activities. It has been opened for We helped Strathcona County celebrate Canada Day at about 117 shifts since June 27, and 17 different club members Festival Place in Sherwood Park by running a solar viewing have put time in over the summer. It is definitely the meat and session from 10 AM to 5 PM as well as constellation talks in the potatoes of our outreach efforts and one of the top public inflatable planetarium, which was on loan to us from TWOSE. I programs of any RASC Centre. estimate that about 150 people looked through the Coronado and No outreach activities have been finalized for the fall; another 150 attended the planetarium talk. Thanks to all the however, we are having discussions with Fort Edmonton Park to volunteers: Alex, Christine and Scott McPhee handled shift #1 participate with some of their programs, possibly Halloween, and and Mervan Gorrie and Jay Lavender looked after the solar we may be approached once again by the Valley Zoo for their viewing during the afternoon. Weather was great, by the way. Safari Night event in October. International Year of Astronomy Committee Report by Orla Aaquist Next year is the International Year of Astronomy (IYA), and University, Brian Martin from Kings University, and Sharon we are hoping to make it a banner year for the Edmonton Centre Morsink from the Physics Department at U of A. Sharon, Martin where we will be working with many external organizations and Brian are also members of the Canadian Astronomical through the City of Edmonton and neighbouring regions. The Society (CASCA). Joint meetings were held on June 18 and driving force behind our efforts is the IYAE committee, and we August 6 at TWOSE to discuss possible joint IYA activities. At have already started planning for 2009. the second meeting we were joined by Dr. Phil Langill, the IYA The IYAE Committee members include both Centre coordinator at the University of Calgary and member of the members and external members. The Centre members are Orla National IYA committee and CASCA. Subsequent to the August Aaquist (chair), Bruce McCurdy, Harris Christian, Ross Sinclair, 6 meeting, the Centre IYAE members met at IYAE headquarters Doug Hube, Frank Florian, Shedon Helbert, Sherry Campbell, on August 18 to review the proposed actives, discuss IYA budget Massimo Torrie, Patrick Earl, Sherrilyn Jahrig, and Luca requirements, and suggest point persons for the various Vanzella. Our first meeting was held on June 11th at IYAE activities. headquarters at Boston Pizza on Jasper and 106th street. At the Over the summer, the IYAE committee has created a list of first meeting we discussed possible Edmonton Centre IYA proposed IYAE activities. These
Load more

Recommended publications
  • Occultation Newsletter Volume 8, Number 4
    Volume 12, Number 1 January 2005 $5.00 North Am./$6.25 Other International Occultation Timing Association, Inc. (IOTA) In this Issue Article Page The Largest Members Of Our Solar System – 2005 . 4 Resources Page What to Send to Whom . 3 Membership and Subscription Information . 3 IOTA Publications. 3 The Offices and Officers of IOTA . .11 IOTA European Section (IOTA/ES) . .11 IOTA on the World Wide Web. Back Cover ON THE COVER: Steve Preston posted a prediction for the occultation of a 10.8-magnitude star in Orion, about 3° from Betelgeuse, by the asteroid (238) Hypatia, which had an expected diameter of 148 km. The predicted path passed over the San Francisco Bay area, and that turned out to be quite accurate, with only a small shift towards the north, enough to leave Richard Nolthenius, observing visually from the coast northwest of Santa Cruz, to have a miss. But farther north, three other observers video recorded the occultation from their homes, and they were fortuitously located to define three well- spaced chords across the asteroid to accurately measure its shape and location relative to the star, as shown in the figure. The dashed lines show the axes of the fitted ellipse, produced by Dave Herald’s WinOccult program. This demonstrates the good results that can be obtained by a few dedicated observers with a relatively faint star; a bright star and/or many observers are not always necessary to obtain solid useful observations. – David Dunham Publication Date for this issue: July 2005 Please note: The date shown on the cover is for subscription purposes only and does not reflect the actual publication date.
    [Show full text]
  • Observations from Orbiting Platforms 219
    Dotto et al.: Observations from Orbiting Platforms 219 Observations from Orbiting Platforms E. Dotto Istituto Nazionale di Astrofisica Osservatorio Astronomico di Torino M. A. Barucci Observatoire de Paris T. G. Müller Max-Planck-Institut für Extraterrestrische Physik and ISO Data Centre A. D. Storrs Towson University P. Tanga Istituto Nazionale di Astrofisica Osservatorio Astronomico di Torino and Observatoire de Nice Orbiting platforms provide the opportunity to observe asteroids without limitation by Earth’s atmosphere. Several Earth-orbiting observatories have been successfully operated in the last decade, obtaining unique results on asteroid physical properties. These include the high-resolu- tion mapping of the surface of 4 Vesta and the first spectra of asteroids in the far-infrared wave- length range. In the near future other space platforms and orbiting observatories are planned. Some of them are particularly promising for asteroid science and should considerably improve our knowledge of the dynamical and physical properties of asteroids. 1. INTRODUCTION 1800 asteroids. The results have been widely presented and discussed in the IRAS Minor Planet Survey (Tedesco et al., In the last few decades the use of space platforms has 1992) and the Supplemental IRAS Minor Planet Survey opened up new frontiers in the study of physical properties (Tedesco et al., 2002). This survey has been very important of asteroids by overcoming the limits imposed by Earth’s in the new assessment of the asteroid population: The aster- atmosphere and taking advantage of the use of new tech- oid taxonomy by Barucci et al. (1987), its recent extension nologies. (Fulchignoni et al., 2000), and an extended study of the size Earth-orbiting satellites have the advantage of observing distribution of main-belt asteroids (Cellino et al., 1991) are out of the terrestrial atmosphere; this allows them to be in just a few examples of the impact factor of this survey.
    [Show full text]
  • 76 Minor Planet Bulletin 45 (2018) TWENTY-ONE ASTEROID LIGHTCURVES at ASTEROIDS OBSERVERS (OBAS)
    76 TWENTY-ONE ASTEROID LIGHTCURVES needed confirmation. All the targets were selected from the AT ASTEROIDS OBSERVERS (OBAS) - MPPD: Collaborative Asteroid Lightcurve (CALL) website at NOV 2016 - MAY 2017 http://www.minorplanet.info/call.html, paying special attention to keeping the asteroid’s magnitude within reach of the telescopes Vicente Mas, G. Fornas being used. We tried to observe asteroids at a phase angle of less CAAT, Centro Astronómico del Alto Turia, SPAIN than 14°, but this was not always possible. [email protected] Images were measured using MPO Canopus (Bdw Publishing) Juan Lozano with a differential photometry technique. For more information Elche Observatory, Alicante, SPAIN about methods and techniques used, see Aznar Macias et al. (2015). Table II lists the individual results along with the range of Onofre Rodrigo dates for the observations and the number of nights that Bétera Observatory, Valencia, SPAIN observations were made. A. Fornas 589 Croatia, Observed on nine nights from 2016 Nov to 2017 Jan. Oropesa Observatory, Castellón, SPAIN Period: 24.73 ± 0.013 h. Amplitude: 0.47 mag. This result is consistent with Behrend (2013), who found 24.821 h, but not with A. Carreño Waszczak et al. (2015) who found 16.385 h. Zonalunar Observatory,Valencia, SPAIN 593 Titania. Observed during five nights 2017 Apr. Period: 9.930 Enrique Arce ± 0.009 h. Amplitude: 0.21 mag. This period is consistent with Vallbona Observatory, Valencia, SPAIN Zappala (1983, 9.89 h), Harris (1989, 9.899 h), and Behrend (2017, 9.8968 h). Pedro Brines TRZ Observatory, Valencia, SPAIN 728 Leonisis. Observed on two nights in 2017 March-April.
    [Show full text]
  • The Minor Planet Bulletin Is Open to Papers on All Aspects of 6500 Kodaira (F) 9 25.5 14.8 + 5 0 Minor Planet Study
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 32, NUMBER 3, A.D. 2005 JULY-SEPTEMBER 45. 120 LACHESIS – A VERY SLOW ROTATOR were light-time corrected. Aspect data are listed in Table I, which also shows the (small) percentage of the lightcurve observed each Colin Bembrick night, due to the long period. Period analysis was carried out Mt Tarana Observatory using the “AVE” software (Barbera, 2004). Initial results indicated PO Box 1537, Bathurst, NSW, Australia a period close to 1.95 days and many trial phase stacks further [email protected] refined this to 1.910 days. The composite light curve is shown in Figure 1, where the assumption has been made that the two Bill Allen maxima are of approximately equal brightness. The arbitrary zero Vintage Lane Observatory phase maximum is at JD 2453077.240. 83 Vintage Lane, RD3, Blenheim, New Zealand Due to the long period, even nine nights of observations over two (Received: 17 January Revised: 12 May) weeks (less than 8 rotations) have not enabled us to cover the full phase curve. The period of 45.84 hours is the best fit to the current Minor planet 120 Lachesis appears to belong to the data. Further refinement of the period will require (probably) a group of slow rotators, with a synodic period of 45.84 ± combined effort by multiple observers – preferably at several 0.07 hours. The amplitude of the lightcurve at this longitudes. Asteroids of this size commonly have rotation rates of opposition was just over 0.2 magnitudes.
    [Show full text]
  • The Minor Planet Bulletin 36, 188-190
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 37, NUMBER 3, A.D. 2010 JULY-SEPTEMBER 81. ROTATION PERIOD AND H-G PARAMETERS telescope (SCT) working at f/4 and an SBIG ST-8E CCD. Baker DETERMINATION FOR 1700 ZVEZDARA: A independently initiated observations on 2009 September 18 at COLLABORATIVE PHOTOMETRY PROJECT Indian Hill Observatory using a 0.3-m SCT reduced to f/6.2 coupled with an SBIG ST-402ME CCD and Johnson V filter. Ronald E. Baker Benishek from the Belgrade Astronomical Observatory joined the Indian Hill Observatory (H75) collaboration on 2009 September 24 employing a 0.4-m SCT PO Box 11, Chagrin Falls, OH 44022 USA operating at f/10 with an unguided SBIG ST-10 XME CCD. [email protected] Pilcher at Organ Mesa Observatory carried out observations on 2009 September 30 over more than seven hours using a 0.35-m Vladimir Benishek f/10 SCT and an unguided SBIG STL-1001E CCD. As a result of Belgrade Astronomical Observatory the collaborative effort, a total of 17 time series sessions was Volgina 7, 11060 Belgrade 38 SERBIA obtained from 2009 August 20 until October 19. All observations were unfiltered with the exception of those recorded on September Frederick Pilcher 18. MPO Canopus software (BDW Publishing, 2009a) employing 4438 Organ Mesa Loop differential aperture photometry, was used by all authors for Las Cruces, NM 88011 USA photometric data reduction. The period analysis was performed using the same program. David Higgins Hunter Hill Observatory The data were merged by adjusting instrumental magnitudes and 7 Mawalan Street, Ngunnawal ACT 2913 overlapping characteristic features of the individual lightcurves.
    [Show full text]
  • Astrometric Asteroid Masses: a Simultaneous Determination
    A&A 565, A56 (2014) Astronomy DOI: 10.1051/0004-6361/201322766 & c ESO 2014 Astrophysics Astrometric asteroid masses: a simultaneous determination Edwin Goffin Aartselaarstraat 14, 2660 Hoboken, Belgium e-mail: [email protected] Received 27 September 2013 / Accepted 18 March 2014 ABSTRACT Using over 89 million astrometric observations of 349 737 numbered minor planets, an attempt was made to determine the masses of 230 of them by simultaneously solving for corrections to all orbital elements and the masses. For 132 minor planets an acceptable result was obtained, 49 of which appear to be new. Key words. astrometry – celestial mechanics – minor planets, asteroids: general 1. Introduction substantial number of test asteroids (349 737). Section 2 explains the basic principles and problems of simultaneous asteroid mass The astrometric determination of asteroid masses is the tech- determination and in Sect. 3 the details of the actual calculations nique of calculating the mass of asteroids (hereafter called “per- are given. Section 4 briefly deals with the observations used and turbing asteroids” or “perturbers”) from the gravitational pertur- explains the statistical analysis of the residuals that was used to bations they exert on the motion of other asteroids (called “test assign weights to, or reject observations. In Sect. 5 the results asteroids”). are presented and Sect. 6 discusses them. The usual procedure to calculate the mass of one aster- Throughout this paper, asteroid masses are expressed in units oid is, first, to identify potential test asteroids by searching −10 of 10 solar masses (M) and generally given to 3 decimal for close approaches with the perturbing asteroids and then places.
    [Show full text]
  • Cumulative Index to Volumes 1-45
    The Minor Planet Bulletin Cumulative Index 1 Table of Contents Tedesco, E. F. “Determination of the Index to Volume 1 (1974) Absolute Magnitude and Phase Index to Volume 1 (1974) ..................... 1 Coefficient of Minor Planet 887 Alinda” Index to Volume 2 (1975) ..................... 1 Chapman, C. R. “The Impossibility of 25-27. Index to Volume 3 (1976) ..................... 1 Observing Asteroid Surfaces” 17. Index to Volume 4 (1977) ..................... 2 Tedesco, E. F. “On the Brightnesses of Index to Volume 5 (1978) ..................... 2 Dunham, D. W. (Letter regarding 1 Ceres Asteroids” 3-9. Index to Volume 6 (1979) ..................... 3 occultation) 35. Index to Volume 7 (1980) ..................... 3 Wallentine, D. and Porter, A. Index to Volume 8 (1981) ..................... 3 Hodgson, R. G. “Useful Work on Minor “Opportunities for Visual Photometry of Index to Volume 9 (1982) ..................... 4 Planets” 1-4. Selected Minor Planets, April - June Index to Volume 10 (1983) ................... 4 1975” 31-33. Index to Volume 11 (1984) ................... 4 Hodgson, R. G. “Implications of Recent Index to Volume 12 (1985) ................... 4 Diameter and Mass Determinations of Welch, D., Binzel, R., and Patterson, J. Comprehensive Index to Volumes 1-12 5 Ceres” 24-28. “The Rotation Period of 18 Melpomene” Index to Volume 13 (1986) ................... 5 20-21. Hodgson, R. G. “Minor Planet Work for Index to Volume 14 (1987) ................... 5 Smaller Observatories” 30-35. Index to Volume 15 (1988) ................... 6 Index to Volume 3 (1976) Index to Volume 16 (1989) ................... 6 Hodgson, R. G. “Observations of 887 Index to Volume 17 (1990) ................... 6 Alinda” 36-37. Chapman, C. R. “Close Approach Index to Volume 18 (1991) ..................
    [Show full text]
  • The Minor Planet Bulletin, We Feel Safe in Al., 1989)
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 43, NUMBER 3, A.D. 2016 JULY-SEPTEMBER 199. PHOTOMETRIC OBSERVATIONS OF ASTEROIDS star, and asteroid were determined by measuring a 5x5 pixel 3829 GUNMA, 6173 JIMWESTPHAL, AND sample centered on the asteroid or star. This corresponds to a 9.75 (41588) 2000 SC46 by 9.75 arcsec box centered upon the object. When possible, the same comparison star and check star were used on consecutive Kenneth Zeigler nights of observation. The coordinates of the asteroid were George West High School obtained from the online Lowell Asteroid Services (2016). To 1013 Houston Street compensate for the effect on the asteroid’s visual magnitude due to George West, TX 78022 USA ever changing distances from the Sun and Earth, Eq. 1 was used to [email protected] vertically align the photometric data points from different nights when constructing the composite lightcurve: Bryce Hanshaw 2 2 2 2 George West High School Δmag = –2.5 log((E2 /E1 ) (r2 /r1 )) (1) George West, TX USA where Δm is the magnitude correction between night 1 and 2, E1 (Received: 2016 April 5 Revised: 2016 April 7) and E2 are the Earth-asteroid distances on nights 1 and 2, and r1 and r2 are the Sun-asteroid distances on nights 1 and 2. CCD photometric observations of three main-belt 3829 Gunma was observed on 2016 March 3-5. Weather asteroids conducted from the George West ISD Mobile conditions on March 3 and 5 were not particularly favorable and so Observatory are described.
    [Show full text]
  • C.H.F. Peters
    NATIONAL ACADEMY OF SCIENCES Ch RISTIAN HEINRIC H F RIEDRIC H PETERS A Biographical Memoir by W I L L I A M ShEE H AN Any opinions expressed in this memoir are those of the author(s) and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoir COPYRIGHT 1999 NATIONAL ACADEMIES PRESS WASHINGTON D.C. CHRISTIAN HEINRICH FRIEDRICH PETERS September 19, 1813–July 18, 1890 BY WILLIAM SHEEHAN N THE MID-NINETEENTH century the discovery of new aster- Ioids was still far from routine. These objects had not yet grown so numerous as to earn for themselves the contemp- tuous label later applied, “vermin of the skies,” and those who excelled in claiming the starlike wanderers from the camouflage of background stars were honored with renown. Hind, de Gasparis, Goldschmidt, Chacornac, Pogson, and Peters were foremost among the early discoverers. Even on this short list C. H. F. Peters stood out. On May 29, 1861—just weeks after the American Civil War began at Fort Sumter—Peters discovered his first aster- oid (72 Feronia). It was the fifth asteroid discovered in North America (others had been found by Ferguson and Searle). Feronia was the first of forty-eight such discoveries that made Peters the most prolific finder of minor planets of his generation, and even today he remains second only to Johann Palisa among visual discoverers of asteroids. Dur- ing his colorful career, he also compiled meticulous star charts of the zodiac, collated observations from manuscripts of Ptolemy, and embroiled himself in a series of often bitter controversies with other astronomers, notably over the ex- istence of an intra-Mercurial planet.
    [Show full text]
  • The Minor Planet Bulletin 40 (2013) 207
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 40, NUMBER 4, A.D. 2013 OCTOBER-DECEMBER 187. LIGHTCURVE ANALYSIS OF EXTREMELY CLOSE Canopus package (Bdw Publishing). NEAR-EARTH ASTEROID – 2012 DA14 Asteroid 2012 DA14 is a near-Earth object (Aten category, q = Leonid Elenin 0.8289, a = 0.9103, e = 0.0894, i = 11.6081). Before the current Keldysh Institute of Applied Mathematics RAS close approach, 2012 DA14 had orbital elements within the Apollo ISON-NM Observatory (MPC H15), ISON category (q = 0.8894, a = 1.0018, e = 0.1081, i = 10.3372). 140007, Lyubertsy, Moscow region, 8th March str., 47-17 Parameters of the orbit make this asteroid an interesting target for a [email protected] possible space mission. Asteroid 202 DA14 was discovered on Feb 23 2012 by the La Sagra Sky Survey, LSSS (MPC code J75). Igor Molotov Keldysh Institute of Applied Mathematics RAS An extremely close approach to the Earth (0.00022 AU or ~34 000 ISON km) occurred 2013 Feb 15.80903. We observed this asteroid after its close approach, 2013 Feb 16, from 02:11:35 UT to 12:17:43 UT (Received: 20 February*) (Table1). Our total observational interval was 10 h 16 min, i.e. ~108% of the rotation period. In this paper we present one of the first lightcurves of near-Earth asteroid 2012 DA14. This is a very interesting near-Earth asteroid, which approached the Earth at a very close distance on Feb. 15 2013. From our UT Δ r phase mag measurements we find a rotational period of 9.485 ± 02:11:35 0.0011 0.988 73.5 11.8 0.144 h with an amplitude of 1.79 mag.
    [Show full text]
  • The Minor Planet Bulletin (Warner Et Al., 2009A)
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 36, NUMBER 4, A.D. 2009 OCTOBER-DECEMBER 133. NEW LIGHTCURVES OF 8 FLORA, 13 EGERIA, consistent with a period near 12.9 h. Hollis et. al. (1987) derived a 14 IRENE, 25 PHOCAEA, 40 HARMONIA, 74 GALATEA, period of 12.790 h. Di Martino (1989) and Harris and Young AND 122 GERDA (1989) also found periods of approximately 12.87 h, as did Piiornen et al. (1998). Torppa et al. (2003) found a sidereal period Frederick Pilcher of 12.79900 h using lightcurve inversion techniques. Several 4438 Organ Mesa Loop attempts have also been made to determine the spin axis Las Cruces, NM 88011 USA orientation for Flora. Hollis et al. (1987) reported a pole longitude [email protected] near 148° while Di Martino et al. (1989) found two possible solutions at longitude 140° or 320°. Torppa et al. (2003) found a (Received: 2009 Jun 30 Revised: 2009 Aug 2) pole solution of (160°, +16°) and sidereal period of 12.79900 h, similar to (155°, +5°) found by Durech (2009a), both using lightcurve inversion methods. Durech’s sidereal period, however, New lightcurves yield synodic rotation periods and was 12.86667 h. amplitudes for: 8 Flora, 12.861 ± 0.001 h, 0.08 ± 0.01 mag; 13 Egeria, 7.0473 ± 0.0001 h, 0.15 ± 0.02 mag in New observations of the asteroid obtained by the author on 8 2007, 0.37 ± 0.02 mag in 2009; 14 Irene, 15.089 ± nights from 2009 Feb.
    [Show full text]
  • Homogeneous Internal Structure of CM-Like Asteroid (41) Daphne￿￿￿ B
    Homogeneous internal structure of CM-like asteroid (41) Daphne B. Carry, F. Vachier, J. Berthier, M. Marsset, P. Vernazza, J. Grice, W. J. Merline, Eric Lagadec, A. Fienga, A. Conrad, et al. To cite this version: B. Carry, F. Vachier, J. Berthier, M. Marsset, P. Vernazza, et al.. Homogeneous internal structure of CM-like asteroid (41) Daphne. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 623, pp.A132. 10.1051/0004-6361/201833898. hal-02118038 HAL Id: hal-02118038 https://hal.archives-ouvertes.fr/hal-02118038 Submitted on 21 Aug 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. A&A 623, A132 (2019) Astronomy https://doi.org/10.1051/0004-6361/201833898 & © B. Carry et al. 2019 Astrophysics Homogeneous internal structure of CM-like asteroid (41) Daphne?,?? B. Carry1, F. Vachier2, J. Berthier2, M. Marsset3, P. Vernazza4, J. Grice1,5, W. J. Merline6, E. Lagadec1, A. Fienga7, A. Conrad8, E. Podlewska-Gaca9,11, T. Santana-Ros9, M. Viikinkoski12, J. Hanuš14, C. Dumas15, J. D. Drummond16, P. M. Tamblyn6,17, C. R. Chapman6, R. Behrend18, L. Bernasconi18, P. Bartczak9, Z. Benkhaldoun10, M. Birlan2, J. Castillo-Rogez19, F.
    [Show full text]