DOCSLIB.ORG

The Comet's Tale and (Spacewatch), 1998 M5 Need of Observation

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

THE COMET’S TALE Newsletter of the Comet Section of the British Astronomical Association Volume 6, No 2 (Issue 12), 1999 October THE SECOND INTERNATIONAL WORKSHOP ON COMETARY ASTRONOMY New Hall, Cambridge, 1999 August 14 - 16 After months of planning and much hard work the participants for the second International Workshop on Cometary Astronomy began to assemble at New Hall, Cambridge on the afternoon and evening of Friday, August 13th. New Hall is one of the more recent Cambridge colleges and includes a centre built for Japanese students as well as accommodation for the graduate and undergraduate students. It is a women’s college and a few participants were later disturbed by the night porter doing his rounds and making sure that all ground floor windows were closed. A hearty dinner was provided, but afterwards I had to leave to continue last minute preparations for the morning. He had searched 1000 hours since Most discoveries were from On Saturday morning, Dan Green 1994 without a discovery. If the Japan, USA and Australia. and Jon Shanklin made a few Edgar Wilson award had been in Southern Hemisphere observers opening announcements. We had operation he would have netted an only discover southern declination nine comet discoverers present average of $4000 a year, though comets, however northern and five continents were some years would be more hemisphere observers find them in represented. The next meeting rewarding and others less. His both hemispheres. There is no would take place in 4 – 5 years search technique is to scan significant trend in discovery time, possibly in America. For east/west and move down in the declination. most of the day the British morning sky. There are three Continued on page 11 Astronomical Association had a conditions for success – you must sales desk in the entrance foyer to look, the comet must be bright Contents New Hall, with a range of eclipse enough and you must find it first. memorabilia on offer, as well as His first three comets were closer copies of cometary publications. Comet Section contacts 2 to the sun than those previously Section news 2 discovered by amateurs in the Tales from the Past 3 Don Machholz gave the opening previous 25 years. Type 1 comets talk about comet hunting. He used Professional Tales 3 are 30 – 60 deg from the Sun in Review of observations 5 to live in a light polluted site and the morning sky, bright, few in drove out to Lomo Prieta for Comet hunting notes 10 number and have small q. Type 2 IWCA Report (cont) 11 comet searching. In 1990 he lie in the evening sky 60 – 120 moved 180 miles to the small Observation of 2P/Encke 17 deg from the Sun, are dim, The comet of 1807 17 town of Colfax (pop 1000) and common and have large q. has since discovered five comets. Predictions for 2000 18 BAA COMET SECTION NEWSLETTER 2 THE COMET’S TALE Comet Section contacts Director: Jonathan Shanklin, 11 City Road, CAMBRIDGE. CB1 1DP, England. Phone: (+44) (0)1223 571250 (H) or (+44) (0)1223 221400 (W) Fax: (+44) (0)1223 362616 (W) E-Mail: [email protected] or [email protected] WWW page : http://www.ast.cam.ac.uk/~jds/ Assistant Director (Observations): Guy Hurst, 16 Westminster Close, Kempshott Rise, BASINGSTOKE, Hampshire. (and also Editor of RG22 4PP, England. The Astronomer magazine) Phone & Fax: (+44) (0)1256 471074 E-Mail: [email protected] or [email protected] CCD Advisor: Nick James, 11 Tavistock Road, CHELMSFORD, Essex. CM1 5JL, England. Phone: (+44) (0)1245 354366 E-mail: [email protected] or [email protected] Photographic Advisor: Michael Hendrie, Overbury, 33 Lexden Road, West Bergholt, COLCHESTER, Essex, CO6 3BX, England Phone: (+44) (0)1206 240021 Subscription to the Section newsletter costs £5 for two years, extended to three years for members who contribute to the work of the Section in any way. Renewals should be sent to the Director and cheques made payable to the BAA. Those due to renew should receive a reminder with this mailing. Section news from the Director Dear Section member, forward to close co-operation (P/Jager), 1998 U5 (LINEAR), between the two groups. 1999 F2 (Dalcanton), 1999 H1 As you will read elsewhere in this (Lee), 1999 H3 (LINEAR), 1999 issue the IWCA was very Since the last newsletter J2 (Skiff), 1999 J3 (LINEAR), successful and an enjoyable time observations or contributions have 1999 K2 (Ferris), 1999 K3 was had by all participants. I was been received from the following (LINEAR), 1999 K5 (LINEAR), pleased to see a good BAA members: Sally Beaumont, 1999 K6 (LINEAR), 1999 K8 representation from British Denis Buczynski, John Fletcher, (LINEAR), 1999 L2 (LINEAR), amateurs and hope that the next James Fraser, Maurice Gavin, 1999 N2 (Lynn), 1999 S3 workshop, likely to be held in the Werner Hasubick, Guy Hurst, (LINEAR), 1999 S4 (LINEAR). USA in five years time will see an Nick James, Martin Mobberley, equally large British contingent. Bob Neville, Gabriel Oksa, Roy Many of the fainter comets were Panther, Jonathan Shanklin, David observed by Seiichi Yoshida who On September 17 I became the Storey, David Strange, John is using a CCD camera on an 18 proud discoverer of a comet Vetterlein and Alex Vincent cm reflector to very good effect. myself. As with many discoveries It is pleasing to have received a there was an element of luck to it, and also from: Jose Aguiar, few CCD observations from UK in that I just happened to be the Alexandr Baransky, John Bortle, observers over the summer and I first person to scan the real time Reinder Bouma, Jose Carvajal, hope the winter will bring many images from the SOHO LASCO Tim Cooper, Stephen Getliffe, more. coronagraph and recognise that Guus Gilein, Bjorn Granslo, there was an intruder present. The Roberto Haver, Andreas The observing supplement discovery does however follow Kammerer, Heinz Kerner, Atilla accompanying this issue of The Don Machholz's tenets of comet Kosa-Kiss, Martin Lehky, Comet's Tale is thinner than usual discovery: you have to look, the Rolando Ligustri, Andrew Pearce to compensate for the thicker main comet must be bright enough and and Seiichi Yoshida (apologies for section. I have only given you have to find it first. any errors or omissions). ephemerides for comets brighter than 10th magnitude. Ephemerides I have agreed to take on the Comets under observation were: for fainter comets are available on Directorship of the Comet Section 10P/Tempel 2, 29P/Schwassmann- the Section web page and of the Society for Popular Wachmann 1, 37P/Forbes, observers can generate their own Astronomy. I've actually been a 52P/Harrington-Abell, charts using the elements given in member of this society longer than 95P/Chiron, 134P/Kowal- the supplement. In future I will I have been a member of the BAA. Vavrova, 140P/Bowell-Skiff, only give ephemerides for fainter SPA members will be able to 1995 O1 (Hale-Bopp), 1997 BA6 comets if they are particularly in subscribe to The Comet's Tale and (Spacewatch), 1998 M5 need of observation. their observations will be included (LINEAR), 1998 P1 (Williams), in the Section archives. I look 1998 T1 (LINEAR), 1998 U3 Jonathan Shanklin BAA COMET SECTION NEWSLETTER 1999 October 3 Tales from the Past This section gives a few excerpts records that two conspicuous from past RAS Monthly Notices, 100 Years Ago: A paper read at comets had been under BAA Journals and Sky & the June meeting discussed 'Who observation and that Tempel's Telescope. First suggested the Periodical comet (10P) had been observed by Return of Comets' and suggested Mr Denning with a 10" (25 cm) 150 Years Ago: The editor noted that Hooke had the idea that telescope. that, given the discovery comets could return as early as circumstances, he would prefer to 1665, following the appearance of 50 Years Ago: The July Journal call Schweizer's comet (1849 G1) the comet of 1664, which Hooke has a note about an article on that of Schweizer-Bond, however thought could be a return of the comet Families by C H Schwette he followed the authority of comet of 1618 [it wasn't]. At this which appeared in Popular Professor Schumacher. time Halley was only 9 and didn't Astronomy in April. He thought Computations by Hind showed voice his famous utterance until that a group of comets with that the 'first Comet of Brorsen, shortly before his death in 1742. aphelia one and a half times that 1846' (5D/Brorsen) had passed At the same meeting a paper by of Pluto implied a tenth planet. very close to Jupiter in May 1842. Mr John Grigg described a The annual report notes He further suggested that there graphic method of computing a observations by George Alcock might be a link with the comets of search ephemeris for a periodic and Albert Jones, both still active 1532 & 1661, which could be comet. The annual report of the observers. investigated further. Section in the October Journal Professional Tales Many of the scientific magazines are taken from the Cambridge determined by a comparison of the have articles about comets in them Conference Network (CCNet), number of comets reported from and this regular feature is intended which is a scholarly electronic the east and west with those to help you find the ones you've network devoted to catastrophism, reported from both regions. An missed. If you find others let me but which includes much analysis of the reports compiled know and I'll put them in the next information on comets.
Recommended publications
  • The Comet's Tale, and Therefore the Object As a Whole Would the Section Director Nick James Highlighted Have a Low Surface Brightness

    The Comet's Tale, and Therefore the Object As a Whole Would the Section Director Nick James Highlighted Have a Low Surface Brightness

    1 Diebold Schilling, Disaster in connection with two comets sighted in 1456, Lucerne Chronicle, 1513 (Wikimedia Commons) THE COMET’S TALE Comet Section – British Astronomical Association Journal – Number 38 2019 June britastro.org/comet Evolution of the comet C/2016 R2 (PANSTARRS) along a total of ten days on January 2018. Composition of pictures taken with a zoom lens from Teide Observatory in Canary Islands. J.J Chambó Bris 2 Table of Contents Contents Author Page 1 Director’s Welcome Nick James 3 Section Director 2 Melvyn Taylor’s Alex Pratt 6 Observations of Comet C/1995 01 (Hale-Bopp) 3 The Enigma of Neil Norman 9 Comet Encke 4 Setting up the David Swan 14 C*Hyperstar for Imaging Comets 5 Comet Software Owen Brazell 19 6 Pro-Am José Joaquín Chambó Bris 25 Astrophotography of Comets 7 Elizabeth Roemer: A Denis Buczynski 28 Consummate Comet Section Secretary Observer 8 Historical Cometary Amar A Sharma 37 Observations in India: Part 2 – Mughal Empire 16th and 17th Century 9 Dr Reginald Denis Buczynski 42 Waterfield and His Section Secretary Medals 10 Contacts 45 Picture Gallery Please note that copyright 46 of all images belongs with the Observer 3 1 From the Director – Nick James I hope you enjoy reading this issue of the We have had a couple of relatively bright Comet’s Tale. Many thanks to Janice but diffuse comets through the winter and McClean for editing this issue and to Denis there are plenty of images of Buczynski for soliciting contributions. 46P/Wirtanen and C/2018 Y1 (Iwamoto) Thanks also to the section committee for in our archive.
  • CYANOGEN JETS and the ROTATION STATE of COMET MACHHOLZ (C/2004 Q2) Tony L

    CYANOGEN JETS and the ROTATION STATE of COMET MACHHOLZ (C/2004 Q2) Tony L

    The Astronomical Journal, 133:2001Y2007, 2007 May # 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A. CYANOGEN JETS AND THE ROTATION STATE OF COMET MACHHOLZ (C/2004 Q2) Tony L. Farnham1 Department of Astronomy, University of Maryland, College Park, MD 20742, USA; [email protected] Nalin H. Samarasinha2 National Optical Astronomy Observatory, Tucson, AZ 85719, USA; and Planetary Science Institute, Tucson, AZ 85719, USA Be´atrice E. A. Mueller1 Planetary Science Institute, Tucson, AZ 85719, USA and Matthew M. Knight1 Department of Astronomy, University of Maryland, College Park, MD 20742, USA Received 2006 June 16; accepted 2007 January 25 ABSTRACT Extensive observations of Comet Machholz (C/2004 Q2) from 2005 February, March, and April were used to derive a number of the properties of the comet’s nucleus. Images were obtained using narrowband comet filters to isolate the CN morphology. The images revealed two jets that pointed in roughly opposite directions relative to the nucleus and changed on hourly timescales. The morphology repeated itself in a periodic manner, and this fact was used to determine a rotation period for the nucleus of 17:60 Æ 0:05 hr. The morphology was also used to estimate a pole orientation of R:A: ¼ 50,decl: ¼þ35, and the jet source locations were found to be on opposite hemispheres at mid- latitudes. The longitudes are also about 180 apart, although this is not well constrained. The CN features were mea- sured to be moving at about 0.8 km sÀ1, which is close to the canonical value typically quoted for gas outflow.
  • The Minor Planet Bulletin 44 (2017) 142

    The Minor Planet Bulletin 44 (2017) 142

    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 44, NUMBER 2, A.D. 2017 APRIL-JUNE 87. 319 LEONA AND 341 CALIFORNIA – Lightcurves from all sessions are then composited with no TWO VERY SLOWLY ROTATING ASTEROIDS adjustment of instrumental magnitudes. A search should be made for possible tumbling behavior. This is revealed whenever Frederick Pilcher successive rotational cycles show significant variation, and Organ Mesa Observatory (G50) quantified with simultaneous 2 period software. In addition, it is 4438 Organ Mesa Loop useful to obtain a small number of all-night sessions for each Las Cruces, NM 88011 USA object near opposition to look for possible small amplitude short [email protected] period variations. Lorenzo Franco Observations to obtain the data used in this paper were made at the Balzaretto Observatory (A81) Organ Mesa Observatory with a 0.35-meter Meade LX200 GPS Rome, ITALY Schmidt-Cassegrain (SCT) and SBIG STL-1001E CCD. Exposures were 60 seconds, unguided, with a clear filter. All Petr Pravec measurements were calibrated from CMC15 r’ values to Cousins Astronomical Institute R magnitudes for solar colored field stars. Photometric Academy of Sciences of the Czech Republic measurement is with MPO Canopus software. To reduce the Fricova 1, CZ-25165 number of points on the lightcurves and make them easier to read, Ondrejov, CZECH REPUBLIC data points on all lightcurves constructed with MPO Canopus software have been binned in sets of 3 with a maximum time (Received: 2016 Dec 20) difference of 5 minutes between points in each bin.
  • 7 X 11 Long.P65

    7 X 11 Long.P65

    Cambridge University Press 978-0-521-85349-1 - Meteor Showers and their Parent Comets Peter Jenniskens Index More information Index a – semimajor axis 58 twin shower 440 A – albedo 111, 586 fragmentation index 444 A1 – radial nongravitational force 15 meteoroid density 444 A2 – transverse, in plane, nongravitational force 15 potential parent bodies 448–453 A3 – transverse, out of plane, nongravitational a-Centaurids 347–348 force 15 1980 outburst 348 A2 – effect 239 a-Circinids (1977) 198 ablation 595 predictions 617 ablation coefficient 595 a-Lyncids (1971) 198 carbonaceous chondrite 521 predictions 617 cometary matter 521 a-Monocerotids 183 ordinary chondrite 521 1925 outburst 183 absolute magnitude 592 1935 outburst 183 accretion 86 1985 outburst 183 hierarchical 86 1995 peak rate 188 activity comets, decrease with distance from Sun 1995 activity profile 188 Halley-type comets 100 activity 186 Jupiter-family comets 100 w 186 activity curve meteor shower 236, 567 dust trail width 188 air density at meteor layer 43 lack of sodium 190 airborne astronomy 161 meteoroid density 190 1899 Leonids 161 orbital period 188 1933 Leonids 162 predictions 617 1946 Draconids 165 upper mass cut-off 188 1972 Draconids 167 a-Pyxidids (1979) 199 1976 Quadrantids 167 predictions 617 1998 Leonids 221–227 a-Scorpiids 511 1999 Leonids 233–236 a-Virginids 503 2000 Leonids 240 particle density 503 2001 Leonids 244 amorphous water ice 22 2002 Leonids 248 Andromedids 153–155, 380–384 airglow 45 1872 storm 380–384 albedo (A) 16, 586 1885 storm 380–384 comet 16 1899
  • Planets and Exoplanets

    Planets and Exoplanets

    NASE Publications Planets and exoplanets Planets and exoplanets Rosa M. Ros, Hans Deeg International Astronomical Union, Technical University of Catalonia (Spain), Instituto de Astrofísica de Canarias and University of La Laguna (Spain) Summary This workshop provides a series of activities to compare the many observed properties (such as size, distances, orbital speeds and escape velocities) of the planets in our Solar System. Each section provides context to various planetary data tables by providing demonstrations or calculations to contrast the properties of the planets, giving the students a concrete sense for what the data mean. At present, several methods are used to find exoplanets, more or less indirectly. It has been possible to detect nearly 4000 planets, and about 500 systems with multiple planets. Objetives - Understand what the numerical values in the Solar Sytem summary data table mean. - Understand the main characteristics of extrasolar planetary systems by comparing their properties to the orbital system of Jupiter and its Galilean satellites. The Solar System By creating scale models of the Solar System, the students will compare the different planetary parameters. To perform these activities, we will use the data in Table 1. Planets Diameter (km) Distance to Sun (km) Sun 1 392 000 Mercury 4 878 57.9 106 Venus 12 180 108.3 106 Earth 12 756 149.7 106 Marte 6 760 228.1 106 Jupiter 142 800 778.7 106 Saturn 120 000 1 430.1 106 Uranus 50 000 2 876.5 106 Neptune 49 000 4 506.6 106 Table 1: Data of the Solar System bodies In all cases, the main goal of the model is to make the data understandable.
  • Doppler Tomography of the Circumstellar Disk of Π Aquarii⋆⋆⋆

    Doppler Tomography of the Circumstellar Disk of Π Aquarii⋆⋆⋆

    A&A 560, A30 (2013) Astronomy DOI: 10.1051/0004-6361/201322114 & c ESO 2013 Astrophysics Doppler tomography of the circumstellar disk of π Aquarii, S. V. Zharikov1, A. S. Miroshnichenko2 , E. Pollmann3, S. Danford2,K.S.Bjorkman4, N. D. Morrison4,A.Favaro5, J. Guarro Fló6,J.N.Terry7, V. Desnoux8, T. Garrel9, G. Martineau10, Y. Buchet10, S. Ubaud11, B. Mauclaire12, H. Kalbermatten13,C.Buil14,C.J.Sawicki15,T.Blank16, and O. Garde17 1 Observatorio Astronomico Nacional, Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, 22800 Ensenada, BC, Mexico e-mail: [email protected] 2 University of North Carolina at Greensboro, Greensboro, NC 27402, USA e-mail: [email protected] 3 Emil-Nolde-Str. 12, 51375 Leverkusen, Germany 4 Ritter Observatory, University of Toledo, Toledo, OH 43606, USA 5 19 Boulevard Carnot, 21000 Dijon, France 6 Balmes, 2, 08784 Piera (Barcelona), Spain 7 6 rue Virgile, 42100 Saint-Etienne, France 8 ARAS, Astronomical Ring for Access to Spectroscopy, France 9 Observatoire de Juvignac, 19 avenue du Hameau du Golf, 34990 Juvignac, France 10 SAPP, CSC des Trois Cités, Le Clos Gaultier, 86000 Poitiers, France 11 16 Calade, St. Roch, 06410 Biot, France 12 Observatoire du Val de l’Arc, route de Peynier, 13530 Trets, France 13 Ebnetstrasse 12, Bitsch, Switzerland 14 Castanet Tolosan Observatory, 6 place Clémence Isaure, 31320 Castanet Tolosan, France 15 Alpha Observatory, Alpine, Texas 79830, USA 16 Dorfstrasse 3f, 8603 Schwerzenbach, Switzerland 17 Observatoire de la Tourbiére, 38690 Chabons, France Received 21 June 2013 / Accepted 23 October 2013 ABSTRACT Aims. The work is aimed at studying the circumstellar disk of the bright classical binary Be star π Aqr.
  • Arxiv:1011.4313V1

    Arxiv:1011.4313V1

    Accepted to ApJ: October 23, 2010 GALEX FUV Observations of Comet C/2004 Q2 (Machholz): The Ionization Lifetime of Carbon Jeffrey P. Morgenthaler Planetary Science Institute, 1700 E. Fort Lowell, Ste 106, Tucson, AZ 85719, USA [email protected] Walter M. Harris Department of Applied Sciences, University of California at Davis, One Shields Ave., Davis, CA 95616, USA Michael R. Combi Department of Atmospheric, Oceanic and Space Sciences, The University of Michigan, 2455 Hayward St. Ann Arbor, MI 48109, Ann Arbor, MI, USA Paul D. Feldman Department of Physics and Astronomy, The Johns Hopkins University Charles and 34th Streets, Baltimore, Maryland 21218, USA Harold A. Weaver Space Department, Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA ABSTRACT 3 arXiv:1011.4313v1 [astro-ph.EP] 18 Nov 2010 We present a measurement of the lifetime of ground state atomic carbon, C( P), against ionization processes in interplanetary space and compare it to the lifetime ex- pected from the dominant physical processes likely to occur in this medium. Our mea- surement is based on analysis of a far ultraviolet (FUV) image of comet C/2004 Q2 (Machholz) recorded by the Galaxy Evolution Explorer (GALEX) on 2005 March 1. The bright C I 1561 A˚ and 1657 A˚ multiplets dominate the GALEX FUV band. We used the image to create high signal-to-noise ratio radial profiles that extended beyond 1×106 km from the comet nucleus. Our measurements yielded a total carbon lifetime of 7.1 – 9.6×105 s (ionization rate of 1.0 – 1.4×10−6 s−1) when scaled to 1 AU.
  • 00E the Construction of the Universe Symphony

    00E the Construction of the Universe Symphony

    The basic construction of the Universe Symphony. There are 30 asterisms (Suites) in the Universe Symphony. I divided the asterisms into 15 groups. The asterisms in the same group, lay close to each other. Asterisms!! in Constellation!Stars!Objects nearby 01 The W!!!Cassiopeia!!Segin !!!!!!!Ruchbah !!!!!!!Marj !!!!!!!Schedar !!!!!!!Caph !!!!!!!!!Sailboat Cluster !!!!!!!!!Gamma Cassiopeia Nebula !!!!!!!!!NGC 129 !!!!!!!!!M 103 !!!!!!!!!NGC 637 !!!!!!!!!NGC 654 !!!!!!!!!NGC 659 !!!!!!!!!PacMan Nebula !!!!!!!!!Owl Cluster !!!!!!!!!NGC 663 Asterisms!! in Constellation!Stars!!Objects nearby 02 Northern Fly!!Aries!!!41 Arietis !!!!!!!39 Arietis!!! !!!!!!!35 Arietis !!!!!!!!!!NGC 1056 02 Whale’s Head!!Cetus!! ! Menkar !!!!!!!Lambda Ceti! !!!!!!!Mu Ceti !!!!!!!Xi2 Ceti !!!!!!!Kaffalijidhma !!!!!!!!!!IC 302 !!!!!!!!!!NGC 990 !!!!!!!!!!NGC 1024 !!!!!!!!!!NGC 1026 !!!!!!!!!!NGC 1070 !!!!!!!!!!NGC 1085 !!!!!!!!!!NGC 1107 !!!!!!!!!!NGC 1137 !!!!!!!!!!NGC 1143 !!!!!!!!!!NGC 1144 !!!!!!!!!!NGC 1153 Asterisms!! in Constellation Stars!!Objects nearby 03 Hyades!!!Taurus! Aldebaran !!!!!! Theta 2 Tauri !!!!!! Gamma Tauri !!!!!! Delta 1 Tauri !!!!!! Epsilon Tauri !!!!!!!!!Struve’s Lost Nebula !!!!!!!!!Hind’s Variable Nebula !!!!!!!!!IC 374 03 Kids!!!Auriga! Almaaz !!!!!! Hoedus II !!!!!! Hoedus I !!!!!!!!!The Kite Cluster !!!!!!!!!IC 397 03 Pleiades!! ! Taurus! Pleione (Seven Sisters)!! ! ! Atlas !!!!!! Alcyone !!!!!! Merope !!!!!! Electra !!!!!! Celaeno !!!!!! Taygeta !!!!!! Asterope !!!!!! Maia !!!!!!!!!Maia Nebula !!!!!!!!!Merope Nebula !!!!!!!!!Merope
  • The Minor Planet Bulletin

    The Minor Planet Bulletin

    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 35, NUMBER 3, A.D. 2008 JULY-SEPTEMBER 95. ASTEROID LIGHTCURVE ANALYSIS AT SCT/ST-9E, or 0.35m SCT/STL-1001E. Depending on the THE PALMER DIVIDE OBSERVATORY: binning used, the scale for the images ranged from 1.2-2.5 DECEMBER 2007 – MARCH 2008 arcseconds/pixel. Exposure times were 90–240 s. Most observations were made with no filter. On occasion, e.g., when a Brian D. Warner nearly full moon was present, an R filter was used to decrease the Palmer Divide Observatory/Space Science Institute sky background noise. Guiding was used in almost all cases. 17995 Bakers Farm Rd., Colorado Springs, CO 80908 [email protected] All images were measured using MPO Canopus, which employs differential aperture photometry to determine the values used for (Received: 6 March) analysis. Period analysis was also done using MPO Canopus, which incorporates the Fourier analysis algorithm developed by Harris (1989). Lightcurves for 17 asteroids were obtained at the Palmer Divide Observatory from December 2007 to early The results are summarized in the table below, as are individual March 2008: 793 Arizona, 1092 Lilium, 2093 plots. The data and curves are presented without comment except Genichesk, 3086 Kalbaugh, 4859 Fraknoi, 5806 when warranted. Column 3 gives the full range of dates of Archieroy, 6296 Cleveland, 6310 Jankonke, 6384 observations; column 4 gives the number of data points used in the Kervin, (7283) 1989 TX15, 7560 Spudis, (7579) 1990 analysis. Column 5 gives the range of phase angles.
  • Arxiv:1402.5240V1 [Astro-Ph.SR]

    Arxiv:1402.5240V1 [Astro-Ph.SR]

    Accepted in ApJ A Preprint typeset using LTEX style emulateapj v. 04/17/13 DISK-LOSS AND DISK-RENEWAL PHASES IN CLASSICAL BE STARS. II. CONTRASTING WITH STABLE AND VARIABLE DISKS Zachary H. Draper1,2, John P. Wisniewski3, Karen S. Bjorkman4, Marilyn R. Meade5, Xavier Haubois6,7, Bruno C. Mota6, Alex C. Carciofi6, Jon E. Bjorkman4 Accepted in ApJ ABSTRACT Recent observational and theoretical studies of classical Be stars have established the utility of polarization color diagrams (PCD) in helping to constrain the time-dependent mass decretion rates of these systems. We expand on our pilot observational study of this phenomenon, and report the detailed analysis of a long-term (1989-2004) spectropolarimetric survey of 9 additional classical Be stars, including systems exhibiting evidence of partial disk-loss/disk-growth episodes as well as sys- tems exhibiting long-term stable disks. After carefully characterizing and removing the interstellar polarization along the line of sight to each of these targets, we analyze their intrinsic polarization be- havior. We find that many steady-state Be disks pause at the top of the PCD, as predicted by theory. We also observe sharp declines in the Balmer jump polarization for later spectral type, near edge-on steady-state disks, again as recently predicted by theory, likely caused when the base density of the disk is very high, and the outer region of the edge-on disk starts to self absorb a significant number of Balmer jump photons. The intrinsic V -band polarization and polarization position angle of γ Cas exhibits variations that seem to phase with the orbital period of a known one-armed density structure in this disk, similar to the theoretical predictions of Halonen & Jones.
  • 108 Afocal Procedure, 105 Age of Globular Clusters, 25, 28–29 O

    108 Afocal Procedure, 105 Age of Globular Clusters, 25, 28–29 O

    Index Index Achromats, 70, 73, 79 Apochromats (APO), 70, Averted vision Adhafera, 44 73, 79 technique, 96, 98, Adobe Photoshop Aquarius, 43, 99 112 (software), 108 Aquila, 10, 36, 45, 65 Afocal procedure, 105 Arches cluster, 23 B1620-26, 37 Age Archinal, Brent, 63, 64, Barkhatova (Bar) of globular clusters, 89, 195 catalogue, 196 25, 28–29 Arcturus, 43 Barlow lens, 78–79, 110 of open clusters, Aricebo radio telescope, Barnard’s Galaxy, 49 15–16 33 Basel (Bas) catalogue, 196 of star complexes, 41 Aries, 45 Bayer classification of stellar associations, Arp 2, 51 system, 93 39, 41–42 Arp catalogue, 197 Be16, 63 of the universe, 28 Arp-Madore (AM)-1, 33 Beehive Cluster, 13, 60, Aldebaran, 43 Arp-Madore (AM)-2, 148 Alessi, 22, 61 48, 65 Bergeron 1, 22 Alessi catalogue, 196 Arp-Madore (AM) Bergeron, J., 22 Algenubi, 44 catalogue, 197 Berkeley 11, 124f, 125 Algieba, 44 Asterisms, 43–45, Berkeley 17, 15 Algol (Demon Star), 65, 94 Berkeley 19, 130 21 Astronomy (magazine), Berkeley 29, 18 Alnilam, 5–6 89 Berkeley 42, 171–173 Alnitak, 5–6 Astronomy Now Berkeley (Be) catalogue, Alpha Centauri, 25 (magazine), 89 196 Alpha Orionis, 93 Astrophotography, 94, Beta Pictoris, 42 Alpha Persei, 40 101, 102–103 Beta Piscium, 44 Altair, 44 Astroplanner (software), Betelgeuse, 93 Alterf, 44 90 Big Bang, 5, 29 Altitude-Azimuth Astro-Snap (software), Big Dipper, 19, 43 (Alt-Az) mount, 107 Binary millisecond 75–76 AstroStack (software), pulsars, 30 Andromeda Galaxy, 36, 108 Binary stars, 8, 52 39, 41, 48, 52, 61 AstroVideo (software), in globular clusters, ANR 1947
  • 1 LIGHTCURVES for ASTEROIDS 18301 KONYUKHOV and 2022 WEST Sinhué A.R. Haro-Corzo, Luis A. Villegas Escuela Nacional De Estudio

    1 LIGHTCURVES for ASTEROIDS 18301 KONYUKHOV and 2022 WEST Sinhué A.R. Haro-Corzo, Luis A. Villegas Escuela Nacional De Estudio

    1 2 LIGHTCURVES FOR ASTEROIDS 18301 KONYUKHOV with a final field of view of 7.6 × 7.6 arcmin .​ All observations ​ AND 2022 WEST were unfiltered. The observed images were corrected using ​ standard IRAF routines in order to correct them for nightly bias, Sinhué A.R. Haro-Corzo, Luis A. Villegas dark current and flat-field effects. We used MPO Canopus Escuela Nacional de Estudios Superiores Unidad Morelia (V9.5.0.14, BDW Publishing, 2017) to carry out differential Universidad Nacional Autónoma de México photometric measurements and lightcurve analysis. Morelia, Michoacán, MÉXICO [email protected] 18301 Konyukhov (1979 QZ9) was discovered on 1979 August ​ 27 by N. S. Chernykh and was named after the Russian traveler Lorenzo Olguín, Julio C. Saucedo, María E. Contreras Fyodor Fyodorovich Konyukhov. It is an outer main-belt asteroid Departamento de Investigación en Física with H magnitude of 13.4 (see JPL Horizons webpage). The Universidad de Sonora asteroid was observed at the OAN-SPM on six nights of 2016 Hermosillo, Sonora, MÉXICO (Aug 20, 21, 22 & 23; Oct 15 & 18). During analysis, Aug 22 observations were treated as two separate sessions because the Pedro V. Sada asteroid passed in front of a bright star. A total of 395 data points Departamento de Física y Matemáticas were used to construct its lightcurve. From this curve, we derived Universidad de Monterrey an intrinsic rotation period of 2.6667±0.0003 h with an amplitude Av. I. Morones Prieto 4500 Pte. of ~0.17 mag (see Figure for 18301 Konyukhov). This period is in San Pedro Garza García, N.L.