astro.wikisort.org - Asteroid
5642 Bobbywilliams, provisional designation 1990 OK1, is an eccentric, stony asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter.
| Discovery [1] | |
|---|---|
| Discovered by | H. E. Holt |
| Discovery site | Palomar Obs. |
| Discovery date | 27 July 1990 |
| Designations | |
MPC designation | (5642) Bobbywilliams |
Named after | Bobby G. Williams (JPL engineer)[2] |
Alternative designations | 1990 OK1 |
Minor planet category | Mars-crosser [1][3][4] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.97 yr (15,330 days) |
| Aphelion | 3.0867 AU |
| Perihelion | 1.5454 AU |
Semi-major axis | 2.3161 AU |
| Eccentricity | 0.3327 |
Orbital period (sidereal) | 3.52 yr (1,287 days) |
Mean anomaly | 235.13° |
Mean motion | 0° 16m 46.56s / day |
| Inclination | 24.956° |
Longitude of ascending node | 310.12° |
Argument of perihelion | 39.038° |
| Physical characteristics | |
| Dimensions | 4.71 km (calculated)[4] |
Synodic rotation period | 4.8341±0.0003 h[5] |
Geometric albedo | 0.20 (assumed)[4] |
Spectral type | S [4] |
Absolute magnitude (H) | 14.0[1][4] · 14.24±0.23[6] |
It was discovered on 27 July 1990, by American astronomer Henry E. Holt at Palomar Observatory in California, United States.[3] The asteroid was named for JPL engineer Bobby Williams.[2]
Orbit and classification
Bobbywilliams orbits the Sun in the inner main-belt at a distance of 1.5–3.1 AU once every 3 years and 6 months (1,287 days). Its orbit has an eccentricity of 0.33 and an inclination of 25° with respect to the ecliptic.[1] A first precovery was taken at the Australian Siding Spring Observatory in 1975, extending the body's observation arc by 15 years prior to its official discovery at Palomar.[3]
Physical characteristics
Rotation period
In July 2011, a rotational lightcurve of Bobbywilliams was obtained from photometric observations by astronomer Julian Oey at both the Australian Kingsgrove (E19) and Leura (E17) observatories. Lightcurve analysis gave a well-defined rotation period of 4.8341 hours with a brightness variation of 0.05 magnitude (U=3).[5]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 4.71 kilometers with an absolute magnitude of 14.0.[4]
Naming
This minor planet was named for Jet Propulsion Laboratory engineer Bobby G. Williams (born 1951), specialized in celestial mechanics and the navigation of space probes. He has been a leading navigation manager when NEAR Shoemaker had its rendezvous with the asteroids 253 Mathilde and 433 Eros,[2] The official naming citation was published by the Minor Planet Center on 28 July 1999 (M.P.C. 35483).[7]
References
- "JPL Small-Body Database Browser: 5642 Bobbywilliams (1990 OK1)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 21 June 2017.
- Schmadel, Lutz D. (2007). "(5642) Bobbywilliams". Dictionary of Minor Planet Names – (5642) Bobbywilliams. Springer Berlin Heidelberg. pp. 478–479. doi:10.1007/978-3-540-29925-7_5346. ISBN 978-3-540-00238-3.
- "5642 Bobbywilliams (1990 OK1)". Minor Planet Center. Retrieved 1 August 2016.
- "LCDB Data for (5642) Bobbywilliams". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2016.
- Oey, Julian (July 2012). "Lightcurve Analysis of Asteroids Observed in 2011 from Leura and Kingsgrove Observatories". The Minor Planet Bulletin. 39 (3): 145–147. Bibcode:2012MPBu...39..145O. ISSN 1052-8091. Retrieved 1 August 2016.
- Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 August 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 August 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5642 Bobbywilliams at AstDyS-2, Asteroids—Dynamic Site
- 5642 Bobbywilliams at the JPL Small-Body Database
На других языках
- [en] 5642 Bobbywilliams
[ru] (5642) Боббиуильямс
(5642) Боббиуильямс (лат. Bobbywilliams) — медленно вращающийся астероид, относящийся к группе астероидов пересекающих орбиту Марса и принадлежащий к спектральному классу A. Он был открыт 27 июля 1990 года американским астрономом Генри Хольтом в Паломарской обсерватории и назван в честь Бобби Уильямса (англ. Bobby Williams), инженера в лаборатории реактивного движения.[1]Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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