The Skyscraper 2009 12.Indd

Total Page:16

File Type:pdf, Size:1020Kb

The Skyscraper 2009 12.Indd The SkyscraperVol. 36 No. 12 December 2009 Amateur Astronomical Society Of Rhode Island · 47 Peeptoad Road North Scituate, RI 02857 · www.theSkyscrapers.org Seagrave Memorial Observatory is open Holiday Party & Meeting to the public weather permitting with Marcia Bartusiak Saturday, December 5th at North Scituate Community Center Skyscrapers is pleased to have Prof. Marcia Bartusiak as our monthly meeting speaker. She will be speaking about her most recently published book, The Day We Found the Universe. Saturdays 7pm - 9pm Combining her training as a journalist Universe, an anthology and commentary Please note that the observatory may be inaccessible for several weeks with a master’s degree in physics, on the historic discovery papers in following a winter storm. Marcia Bartusiak has been covering the astronomy, and most recently The Day See www.theSkyscrapers.org fields of astronomy and physics for three We Found the Universe, on the birth of for updates. decades. She is currently a professor of modern cosmology. Bartusiak is a two- North Scituate science writing at the Massachusetts time winner of the American Institute Community Center Institute of Technology and has of Physics Science Writing Award and All of our winter meetings (Dec-Mar) are published in a variety of publications, in 2006 garnered the AIP’s prestigious held at the Community Center. From including Science, Smithsonian, Gemant Award for her “significant Seagrave Observatory, the Community Discover, National Geographic, Sky contributions to the cultural, artistic, Center is the first building on the right & Telescope, and Astronomy. She is or humanistic dimension of physics.” side going south on Rt. 116 after the intersection of Rt. 6 Bypass (also Rt. 101) the author of Thursday’s Universe, a In 2008 Bartusiak was elected a Fellow and Rt. 116. Parking is across the street. guide to the frontiers of astrophysics; of the American Association for the Through a Universe Darkly, a history Advancement of Science, cited for of astronomers’ quest to discover the “exceptionally clear communication December 2009 universe’s composition; and Einstein’s of the rich history, the intricate nature, Unfinished Symphony, a chronicle of the and the modern practice of astronomy 2 Full Moon international attempt to detect cosmic to the public at large.” Bartusiak lives gravity waves. All three were named with her husband, mathematician Steve 8 Last Quarter Moon notable books by the New York Times. Lowe, and their dog Hubble in a suburb She went on to write Archives of the of Boston. 13 Geminids meteor shower peaks The Day We Found the Universe: A dramatic narrative of the discovery of the true nature and startling size of the universe, delving back past 16 New Moon the moment of revelation to trace the decades of work—by a select group of scientists—that made it possible. On January 1, 1925, thirty-five-year-old Edwin Mercury at greatest Hubble announced findings that ultimately established that our universe 18 Eastern elongation (20°) was a thousand trillion times larger than previously believed, filled with myriad galaxies like our own. It was a realization that reshaped how humans 19 Jupiter 0.6°S of Neptune understood their place in the cosmos. Six years later, continuing research by Hubble and others forced Albert Einstein to renounce his own cosmic model 21 Mars is stationary and finally accept the astonishing fact that the universe was not immobile but instead expanding. The story of these interwoven discoveries includes 21 Winter Solstice battles of will, clever insights, and wrong turns made by the early investigators in this great twentieth-century pursuit. Here is the watershed moment in our Ursid meteor shower cosmic history, splendidly arising from the exceptional combination of human 22 peaks curiosity, intelligence, and enterprise. NOTE: Marcia will be available after the talk to sign her books. For those who do not already have a copy of her book(s), she will have some available for 24 First Quarter Moon purchase at $20 per copy. 31 Full Moon THE SKYSCRAPER • DECEMBER 2009 President’s Message Bob Horton The December meeting and holiday whenever Mars is well placed for party will be held on Saturday, December viewing, something I have been doing 5th at the North Scituate Community for years now. Providing that the seeing House. The festivities will begin at 7:00 conditions are good, and that you use pm. As we have done so enjoyably in the best optics, it really is amazing how the past, this will be a “potluck” style much detail you can observe on the red The Skyscraper is published monthly by Skyscrapers, Inc. Meetings are usually held party, so we ask that everyone bring planet. I highly recommend sketching on the first Friday of the month. Public a favorite food item to share. We’ll the planet because it trains you to look observing is usually held every Saturday supply coffee, hot chocolate, apple for the finest detail visible. While we night at Seagrave Memorial Observatory, cider, and some pastry. Just let me can’t be guaranteed of good weather, weather permitting. know what food item you plan to bring we do have the fine optics of our 8¼” President so that our efforts will be coordinated Alvan Clark refracting telescope to Bob Horton [email protected] and we don’t end up with too much of provide us with some nice views of any one item. You can contact me via Mars. 1st Vice President e-mail at [email protected] or call In collaboration with Brown Bob Napier [email protected] me at 401-556-8091. University’s Physics Department, we 2nd Vice President The winter months are upon us also plan to have a stellar spectroscopy Steve Hubbard [email protected] now, along with some fun observing workshop sometime in January. I’ll have activity. more information on this workshop in Secretary We recently had a successful CCD the next newsletter. Jim Crawford [email protected] Imaging Workshop at Seagrave With the close of the year Treasurer Observatory. About a dozen members approaching, I want to take this time Lloyd Merrill [email protected] spent a couple of hours learning how to thank everyone that has volunteered to use a CCD camera on our 16” Meade for our public outreach programs Members at Large telescope. We were able to take a number during the past year. The Observatory Tom Thibault [email protected] of nice images that can now be seen Committee is looking to expand its Roger Forsythe [email protected] on our web site. We plan on offering ranks, and if you’re interested in Trustees more opportunities throughout the becoming a key holder and helping Jim Brenek [email protected] winter for any member of Skyscrapers out with our Saturday night public Steve Siok [email protected] to collect CCD images of your favorite programs, please contact one of the Tom Barbish [email protected] celestial objects. You’ll also learn how Trustees or see me at the meeting. to make your images really look great I wish all of you the very best this Star Party Coordinator Bob Forgiel [email protected] using image processing techniques. holiday season. The planet Mars will be at opposition Clear Skies, Librarian in late January. Although this Bob Horton Bruce Merrill [email protected] opposition does not bring Mars close to the Earth, the planet will be visible Historian Dave Huestis [email protected] high above the horizon, allowing for higher magnification to be used. One Editor of my favorite observing activities Jim Hendrickson [email protected] has been making a series of drawings Directions Directions to Seagrave Memorial Observatory are located on the back page of this newsletter. Executive CCD Imaging Submissions Submissions to The Skyscraper are always welcome. Please submit items Committee Workshops for the newsletter no later than Saturdays at Seagrave December 18 to Jim Hendrickson, Meeting 1 Sunflower Circle, North Providence, RI Observatory 02911 or email to [email protected]. Wednesday, For more information including December 2 @ 7pm Email subscriptions a schedule of events contact: To receive The Skyscraper by email, send Seagrave Observatory [email protected] email with your name and address to All Members Welcome or call 556-8091 [email protected]. Note that you will no longer receive the newsletter by postal mail. 2 Avoiding the “Trash Scope” Trap Craig Cortis Here we go with another article that color, the better. Regarding binoculars, tube firmly in altitude. On a tripod- experienced amateurs can ignore—this never buy anything having red (so-called mounted scope of a certain general is intended for readers who might not “ruby”) coatings or amber/gold-tinted range in length, you’ve absolutely got feel knowledgeable enough to make a coatings—this is a certain indication of to have the capability of keeping the wise purchase of a first-time telescope, inferior, unsuitable instruments that tube pointed steadily in altitude, as or who are considering buying a scope don’t satisfy the viewing requirements well as make convenient and positive as a gift for another person, particularly of astronomy. (Be sure to read item slight adjustments up-and-down. a child. We give gifts at other times #9 thoroughly for more references to This is why the altitude bar (or shaft) of the year, of course, but Christmas binoculars.) You’d do well to choose I’m mentioning here is so critical for is probably the biggest occasion for a fixed-power (not “zoom”) model of at long-focus small scopes, such as an astronomy-related gift purchases. This least 35mm aperture up to 50mm, with f/11 60 or 70mm aperture refractor.
Recommended publications
  • Major Meteor Showers Throughout the Year
    Major Meteor Showers Throughout the Year Courtesy of The Catawba Valley Astronomy Club - www.catawbasky.org Information taken from http://www.amsmeteors.org/showers.html The meteor showers discussed below recur each year; in some cases they have been recognized for hundreds of years. The name of the shower in most cases indicates the constellation from which the meteors appear. Sporadic meteors are those random meteors not associated with a particular shower; they are the random detritus left over from the creation of the solar system or are old dispersed debris not recognizable today as shower meteors. For meteor observers, those located in the northern hemisphere have a distinct advantage as shower activity is stronger there than that seen by observers located south of the equator. The reason for this is that most of the major showers have meteors that strike the Earth in areas located far above the equator. As seen from the northern hemisphere these meteors would appear to rain down from high in the sky in all directions. The year begins with the intense but brief Quadrantid maximum (January 3/4). Its brevity combined with typically poor winter weather hampers observation. January overall has good meteor rates restricted to the last third of the night. Rates to 20/hour can be obtained. A large number of radiants spread along the ecliptic from Cancer to Virgo. This activity diminishes somewhat in February with the same areas active. Late-night rates are fair in the first half of March, but become poor rather suddenly after mid-March. The very poor rates, seldom reaching 10/hour, continue into early June.
    [Show full text]
  • Geminid Meteor Shower Activity Should Increase
    EPSC Abstracts Vol. 12, EPSC2018-397, 2018 European Planetary Science Congress 2018 EEuropeaPn PlanetarSy Science CCongress c Author(s) 2018 Geminid meteor shower activity should increase Galina O. Ryabova (1), Jurgen Rendtel (2) (1) Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Tomsk, Russian Federation ([email protected]), (2) Leibniz-Institut fur Astrophysik Potsdam (AIP), Germany Abstract 2. Model Mathematical modelling has shown that activity of We used one a model with meteoroids of the ‘visual’ the Geminid meteor shower should rise with time, mass of 0.02 g from [6] and extended it until 2025 and that was confirmed by analysis of visual January 1. The model consists of 30 000 meteoroids observations 1985–2017. generated around starting epoch JD 1720165.2248 (perihelion passage) using, as we mentioned, the cometary scenario of ejection. For details of the 1. Introduction model, method, and references, see [6]. The Geminid meteor shower is an annual major shower with the maximum activity on December 14. Why activity should increase? The answer is clear In 2017, asteroid (3200) Phaethon, recognised parent from Fig. 1. Phaethon’s node and the mean orbit of body of the stream, had a close encounter with the the stream (i.e. the densest part of the stream) Earth on December 16. When the Earth passes closer gradually approach the Earth’s orbit. So the Geminid to a parent body orbit of a meteoroid stream, an shower activity should increase slowly. Why we increased activity of the shower is expected. We should not expect an outburst? Because the Geminid elaborated the model to see, if it is the case, and stream had no replenishment after the initial made a comparison with visual and video catastrophic generation [2, 6].
    [Show full text]
  • Assessing Risk from Dangerous Meteoroids in Main Meteor Showers Andrey Murtazov
    Proceedings of the IMC, Mistelbach, 2015 155 Assessing risk from dangerous meteoroids in main meteor showers Andrey Murtazov Astronomical observatory, Ryazan State University, Ryazan, Russia [email protected] The risk from dangerous meteoroids in main meteor showers is calculated. The showers were: Quadrantids–2014; Eta Aquariids–2013, Perseids–2014 and Geminids–2014. The computed results for the risks during the shower periods of activity and near the maximum are provided. 1 Introduction The activity periods of these showers (IMO) are: Quadrantids–2014; 1d; Eta Aquariids–2013; 10d, Bright meteors are of serious hazard for space vehicles. Perseids–2014; 14d and Geminids–2014; 4d. A lot of attention has been recently paid to meteor Our calculations have shown that the average collisions N investigations in the context of the different types of of dangerous meteoroids for these showers in their hazards caused by comparatively small meteoroids. activity periods are: Furthermore, the investigation of risk distribution related Quadrantids–2014: N = (2.6 ± 0.5)10-2 km-2; to collisions of meteoroids over 1 mm in diameter with Eta Aquariids–2013: N = (2.8)10-1 km-2; space vehicles is quite important for the long-term Perseids–2014: N = (8.4 ± 0.8)10-2 km-2; forecast regarding the development of space research and Geminids–2014: N = (4.8 ± 0.8)10-2 km-2. circumterrestrial ecology problems (Beech, et al., 1997; Wiegert, Vaubaillon, 2009). Consequently, the average value of collision risk was: Considered hazardous are the meteoroids that create -2 -1 Quadrantids–2014: R = 0.03 km day ; meteors brighter than magnitude 0.
    [Show full text]
  • 17. a Working List of Meteor Streams
    PRECEDING PAGE BLANK NOT FILMED. 17. A Working List of Meteor Streams ALLAN F. COOK Smithsonian Astrophysical Observatory Cambridge, Massachusetts HIS WORKING LIST which starts on the next is convinced do exist. It is perhaps still too corn- page has been compiled from the following prehensive in that there arc six streams with sources: activity near the threshold of detection by pho- tography not related to any known comet and (1) A selection by myself (Cook, 1973) from not sho_m to be active for as long as a decade. a list by Lindblad (1971a), which he found Unless activity can be confirmed in earlier or from a computer search among 2401 orbits of later years or unless an associated comet ap- meteors photographed by the Harvard Super- pears, these streams should probably be dropped Sehmidt cameras in New Mexico (McCrosky and from a later version of this list. The author will Posen, 1961) be much more receptive to suggestions for dele- (2) Five additional radiants found by tions from this list than he will be to suggestions McCrosky and Posen (1959) by a visual search for additions I;o it. Clear evidence that the thresh- among the radiants and velocities of the same old for visual detection of a stream has been 2401 meteors passed (as in the case of the June Lyrids) should (3) A further visual search among these qualify it for permanent inclusion. radiants and velocities by Cook, Lindblad, A comment on the matching sets of orbits is Marsden, McCrosky, and Posen (1973) in order. It is the directions of perihelion that (4) A computer search
    [Show full text]
  • Meteor Showers # 11.Pptx
    20-05-31 Meteor Showers Adolf Vollmy Sources of Meteors • Comets • Asteroids • Reentering debris C/2019 Y4 Atlas Brett Hardy 1 20-05-31 Terminology • Meteoroid • Meteor • Meteorite • Fireball • Bolide • Sporadic • Meteor Shower • Meteor Storm Meteors in Our Atmosphere • Mesosphere • Atmospheric heating • Radiant • Zenithal Hourly Rate (ZHR) 2 20-05-31 Equipment Lounge chair Blanket or sleeping bag Hot beverage Bug repellant - ThermaCELL Camera & tripod Tracking Viewing Considerations • Preparation ! Locate constellation ! Take a nap and set alarm ! Practice photography • Location: dark & unobstructed • Time: midnight to dawn https://earthsky.org/astronomy- essentials/earthskys-meteor-shower- guide https://www.amsmeteors.org/meteor- showers/meteor-shower-calendar/ • Where to look: 50° up & 45-60° from radiant • Challenges: fatigue, cold, insects, Moon • Recording observations ! Sky map, pen, red light & clipboard ! Time, position & location ! Recording device & time piece • Binoculars Getty 3 20-05-31 Meteor Showers • 112 confirmed meteor showers • 695 awaiting confirmation • Naming Convention ! C/2019 Y4 (Atlas) ! (3200) Phaethon June Tau Herculids (m) Parent body: 73P/Schwassmann-Wachmann Peak: June 2 – ZHR = 3 Slow moving – 15 km/s Moon: Waning Gibbous June Bootids (m) Parent body: 7p/Pons-Winnecke Peak: June 27– ZHR = variable Slow moving – 14 km/s Moon: Waxing Crescent Perseid by Brian Colville 4 20-05-31 July Delta Aquarids Parent body: 96P/Machholz Peak: July 28 – ZHR = 20 Intermediate moving – 41 km/s Moon: Waxing Gibbous Alpha
    [Show full text]
  • Smithsonian Contributions Astrophysics
    SMITHSONIAN CONTRIBUTIONS to ASTROPHYSICS Number 14 Discrete Levels off Beginning Height off Meteors in Streams By A. F. Cook Number 15 Yet Another Stream Search Among 2401 Photographic Meteors By A. F. Cook, B.-A. Lindblad, B. G. Marsden, R. E. McCrosky, and A. Posen Smithsonian Institution Astrophysical Observatory Smithsonian Institution Press SMITHSONIAN CONTRIBUTIONS TO ASTROPHYSICS NUMBER 14 A. F. cook Discrete Levels of Beginning Height of Meteors in Streams SMITHSONIAN INSTITUTION PRESS CITY OF WASHINGTON 1973 Publications of the Smithsonian Institution Astrophysical Observatory This series, Smithsonian Contributions to Astrophysics, was inaugurated in 1956 to provide a proper communication for the results of research conducted at the Astrophysical Observatory of the Smithsonian Institution. Its purpose is the "increase and diffusion of knowledge" in the field of astrophysics, with particular emphasis on problems of the sun, the earth, and the solar system. Its pages are open to a limited number of papers by other investigators with whom we have common interests. Another series, Annals of the Astrophysical Observatory, was started in 1900 by the Observa- tory's first director, Samuel P. Langley, and was published about every ten years. These quarto volumes, some of which are still available, record the history of the Observatory's researches and activities. The last volume (vol. 7) appeared in 1954. Many technical papers and volumes emanating from the Astrophysical Observatory have appeared in the Smithsonian Miscellaneous Collections. Among these are Smithsonian Physical Tables, Smithsonian Meteorological Tables, and World Weather Records. Additional information concerning these publications can be obtained from the Smithsonian Institution Press, Smithsonian Institution, Washington, D.C.
    [Show full text]
  • Radar Meteors Range Distribution Model
    Contrib. Astron. Obs. Skalnat´ePleso 37, 147 – 160, (2007) Radar meteors range distribution model III. Ablation, shape-density and self-similarity parameters D. Pecinov´aand P. Pecina Astronomical Institute of the Czech Academy of Sciences 251 65 Ondˇrejov, The Czech Republic, (E-mail: [email protected]) Received: January 23, 2007; Accepted: July 3, 2007 Abstract. The theoretical radar meteors Range Distribution of the overdense echoes developed by Pecinov´aand Pecina (2007 a) is applied here to observed range distributions of meteors belonging to the Quadrantid, Perseid, Leonid, Geminid, γ Draconid (Giacobinid), ζ Perseid and β Taurid streams to study the variability of the shape-density, ablation, and self-similarity parameters of meteoroids of these streams. We have found in accordance with results of photographical observations that ablation parameter σ is higher for members of showers of clearly cometary origin, and is lower for Geminid and daytime shower meteoroids. Levin’s self-similarity parameter µ was found to be much greater than the classical value 2/3 for all investigated streams with the exception of Geminids, for which the value found is almost classical, i. e. 0.66 ± 0.01. The method of getting µ by means of fitting the light curve of faint TV meteors is also suggested. Key words: physics of meteors – radar meteors – range distribution – ablation, shape density and self-similarity parameters 1. Introduction At the very beginning, our aim was to develop a model allowing for the com- putation of fluxes and mass distribution indices of meteor showers. To achieve this goal, we developed the radar meteors range distribution model (RaDiM) (Pecinov´aand Pecina, 2007 a) which we will refer to as Paper I.
    [Show full text]
  • 3D/Biela and the Andromedids: Fragmenting Versus Sublimating Comets P
    The Astronomical Journal, 134:1037 Y 1045, 2007 September # 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A. 3D/BIELA AND THE ANDROMEDIDS: FRAGMENTING VERSUS SUBLIMATING COMETS P. Jenniskens1 and J. Vaubaillon2 Received 2007 January 3; accepted 2007 April 22 ABSTRACT Comet 3D/Biela broke up in 1842/1843 and continued to disintegrate in the returns of 1846 and 1852. When meteor storms were observed in November of 1872 and 1885, it was surmised that those showers were the debris from that breakup. This could have come from one of two sources: (1) the initial separation of fragments near aphelion or (2) the continued disintegration of the fragments afterward. Alternatively, the meteoroids could simply have come from water vapor drag when the fragments approached perihelion (option 3). We investigated the source of the Andromedid storms by calculating the dynamical evolution of dust ejected in a normal manner by water vapor drag in the returns from 1703 to 1866, assuming that the comet would have remained similarly active over each return. In addition, we simulated the isotropic ejection of dust during the initial fragmentation event at aphelion in December of 1842. We conclude that option 2 is the most likely source of meteoroids encountered during the 1872 and 1885 storms, but this accounts for only a relatively small amount of mass lost in a typical comet breakup. Key words: comets: individual (3D/Biela) — meteors, meteoroids — minor planets, asteroids 1. INTRODUCTION 2. THE COMET AND ITS SHOWER Ever since Whipple (1951) showed that water vapor can ac- 2.1.
    [Show full text]
  • Multi-Instrumental Observations of the 2014 Ursid Meteor Outburst
    Multi‐instrumental observations of the 2014 Ursid meteor outburst Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 2, p.2206‐2213 Manuel Moreno‐Ibáñez, Josep Ma. Trigo‐Rodríguez, José María Madiedo, Jérémie Vaubaillon, Iwan P. Williams, Maria Gritsevich, Lorenzo G. Morillas, Estefanía Blanch, Pep Pujols, François Colas, Philippe Dupouy ‐ Instituto de Ciencias del Espacio ‐ 2014 Ursid meteor shower 1. Introduction Why so poor work on the Ursids? Why so poor work on the Ursids? • Similar date than Geminids, which • Similar date than Geminids, which are are more predictable and more predictable and numerous. numerous. • Usually low ZHR? (<10) • Usually low ZHR (<10) • Bad weather conditions in mid‐ • Bad weather conditions in mid‐ December. December. Any explanation? Why are they interesting? • ZHR > 100 when the comet is • Mean motion resonances. at its aphelion. • The meteor swarms detached during • This increase occurs each 13.6 certain years evolve to a different orbit an years approx. get trapped in a 7:6 resonance with • Annual shower? also increases Jupiter=> Period ?roughly fixed. remarkably when the comet is • T swarm/ T comet = 1,011 => In around 45 at its perihelion but not or 46 orbits the comet and the swarm are always. out of phase. 2 2014 Ursid meteor shower 1. Introduction Who is their parent body? Why so poor work on the Ursids? • Comet 8P/Tuttle (Ceplecha (1951)) • Similar date than Geminids, which are • Jupiter Family more predictable and numerous. • Trapped in a 15:13 resonance with • Usually low ZHR (<10) Jupiter => T~13.6 yr. • Bad weather conditions in mid‐ • Aphelion: 10 AU.
    [Show full text]
  • Geminids Meteor Shower 2014 Experts Dr. Bill Cooke, Rhiannon
    NASA Chat: Geminids Meteor Shower 2014 Experts Dr. Bill Cooke, Rhiannon Blaauw December 13-14, 2014 _____________________________________________________________________________________ rhiannon_blaauw: Good evening! Unfortunately we are clouded out here currently which is why you won't be seeing anything in the feed right now, but hopefully it will clear off later. We are ready to take your questions now! And we hope you are all having clearer skies than us. klee: Hi, is the Geminids meteror shower seen across the nation? bill_cooke: Yes, it is. klee: Can I see it from Brooklyn, NY? bill_cooke: Yes, if the sky is clear. Guest: I can't seem to catch the live video on Ustream...I'm in South America: am I connecting at the right time? bill_cooke: Few technical difficulties with the stream - it is being worked. Jerry: My birthday is December 14, and I've always wondered how often does the Geminids shower occur on the 13/14th. Every year, 2 years, 3 years? bill_cooke: Every year don: can we see this meteor shower in calf bill_cooke: Yes faye: when is the peak hours for waco? bill_cooke: About 1:30 - 2 am. Jgrasham: I saw that the Geminids first appeared in the early 19th century. Any guesses about how long they will last? rhiannon_blaauw: The Geminids are a relatively young meteor shower, first recorded in the 1860's. The rates have been gradually increasing in strength over the years and now it is one of the most consistently impressive meteor showers each year... however in a few centuries, Jupiter's gravity will have moved the stream away from Earth enough that we will no longer see the shower.
    [Show full text]
  • The Status of the NASA All Sky Fireball Network
    https://ntrs.nasa.gov/search.jsp?R=20120004179 2019-08-30T19:42:51+00:00Z The Status of the NASA All Sky Fireball Network William J. Cooke Meteoroid Environment Office, NASA Marshall Space Flight Center, Huntsville, AL 35812 USA. [email protected] Danielle E. Moser MITS/Dynetics, NASA Marshall Space Flight Center, Huntsville, AL 35812 USA. [email protected] Abstract Established by the NASA Meteoroid Environment Office, the NASA All Sky Fireball Network consists of 6 meteor video cameras in the southern United States, with plans to expand to 15 cameras by 2013. As of mid-2011, the network had detected 1796 multi-station meteors, including meteors from 43 different meteor showers. The current status of the NASA All Sky Fireball Network is described, alongside preliminary results. 1 Introduction The NASA Meteoroid Environment Office (MEO), located at the Marshall Space Flight Center in Huntsville, Alabama, USA, is the NASA organization responsible for meteoroid environments as they pertain to spacecraft engineering and operations. Understanding the meteoroid environment can help spacecraft designers to better protect critical components on spacecraft or avoid critical operations such as extravehicular activities during periods of higher flux such as meteor showers. In mid-2008, the MEO established the NASA All Sky Fireball Network, a network of meteor cameras in the southern United States. The objectives of this video network are to 1) establish the speed distribution of cm-sized meteoroids, 2) determine which sporadic sources produce large particles, 3) determine (low precision) orbits for bright meteors, 4) attempt to discover the size at which showers begin to dominate the meteoroid flux, 5) monitor the activity of major meteor showers, and 6) assist in the location of meteorite falls.
    [Show full text]
  • Lunar Geminids 4 January 2007
    Lunar Geminids 4 January 2007 combustion, but in this case no oxygen is required: Geminid meteoroids hit the ground traveling 35 km/s (78,000 mph). "At that speed, even a pebble can blast a crater several feet wide," says Cooke. "The flash of light comes from rocks and soil made so hot by impact that they suddenly glow." Cooke's group has been monitoring the Moon's nightside (the best place to see flashes of light) since late 2005 and so far they've recorded 19 hits: five or six Geminids, three Leonids, one Taurid and a dozen random meteoroids (sporadics). "The amazing thing is," says Cooke, "we’ve done it using a pair of ordinary backyard telescopes, 14-inch, and off-the-shelf CCD cameras. Amateur astronomers could be recording these explosions, Lunar impacts since Nov. 2005. Numbers 14-16 and too." 19-20 are Geminids. Number 18 is a probable Geminid. Credit: NASA Meteoroid Environment Group. Indeed, he hopes they will. The NASA team can't observe 24-7. Daylight, bad weather, equipment malfunctions, vacations—"lots of things get in the Another meteor shower, another bunch of lunar way of maximum observing." Amateur astronomers impacts... "On Dec. 14, 2006, we observed at least could fill in the gaps. A worldwide network of five Geminid meteors hitting the Moon," reports Bill amateurs, watching the Moon whenever possible, Cooke of NASA's Meteoroid Environment Office in "would increase the number of explosions we Huntsville, AL. Each impact caused an explosion catch," he says. ranging in power from 50 to 125 lbs of TNT and a flash of light as bright as a 7th-to-9th magnitude To that end, Cooke plans to release data reduction star.
    [Show full text]