Astronomy:1940 Whipple
_Whipple.png) Modelled shape of Whipple from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | Harvard College Obs. |
| Discovery site | Agassiz Stn. |
| Discovery date | 2 February 1975 |
| Designations | |
| (1940) Whipple | |
| Named after | Fred L. Whipple (American astronomer)[2] |
| 1975 CA · 1932 AD 1950 LH · 1962 SH 1970 EC1 · 1971 KD1 1971 KN · A916 AD | |
| Minor planet category | main-belt · (outer)[3] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 54.50 yr (19,907 days) |
| |{{{apsis}}}|helion}} | 3.2556 AU |
| |{{{apsis}}}|helion}} | 2.8656 AU |
| 3.0606 AU | |
| Eccentricity | 0.0637 |
| Orbital period | 5.35 yr (1,956 days) |
| Mean anomaly | 18.583° |
| Mean motion | 0° 11m 2.76s / day |
| Inclination | 6.5587° |
| Longitude of ascending node | 263.80° |
| 179.82° | |
| Physical characteristics | |
| Mean diameter | 32.57±0.43 km[4] 33.83 km (derived)[3] 33.87±1.3 km[5] 36.34±0.66 km[6] 37.481±0.250 km[7] 40.431±0.471 km[8] |
| Rotation period | 5.78±0.03 h[9] 6.953±0.003 h[10] |
| Geometric albedo | 0.0430±0.0097[8] 0.054±0.002[6] 0.0560 (derived)[3] 0.060±0.009[4] 0.0613±0.005[5] |
| C[3][11] | |
| Absolute magnitude (H) | 11.0[5][6][8] · 11.1[1][3][4] · 11.16±0.27[11] |
1940 Whipple (prov. designation: 1975 CA) is a carbonaceous background asteroid from the outer region of the asteroid belt, approximately 35 kilometers (22 miles) in diameter. It was discovered on 2 February 1975, by the Harvard College Observatory at its George R. Agassiz Station near Harvard, Massachusetts, in the United States, and named after astronomer Fred Whipple.[12]
Classification and orbit
Whipple orbits the Sun in the outer main-belt at a distance of 2.9–3.3 AU once every 5 years and 4 months (1,956 days). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.[1] The first used observation was made at Goethe Link Observatory in 1962, extending the asteroid's observation arc by 13 years prior to its discovery observation.[12]
Naming
This minor planet was named after American astronomer Fred Lawrence Whipple (1906–2004), author of the icy conglomerate model, also known as the dirty snowball hypothesis.[2]
Whipple worked at the Harvard College Observatory for over 70 years and was the director of the Smithsonian Astrophysical Observatory where he developed new methods imaging meteors. He was also president of several commissions at the International Astronomical Union and on NASA's panel for missions to small Solar System bodies.[2] The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3828).[13]
Physical characteristics
Whipple has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[11]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 32.6 and 40.4 kilometers in diameter and its surface has a low albedo between 0.04 and 0.06.[4][5][6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.056 and a diameter of 33.8 kilometers using an absolute magnitude of 11.1.[3]
Lightcurves
In December 2011, a rotational lightcurve was obtained for this asteroid from photometric observations by American astronomer Russel Durkee at the Shed of Science Observatory (H39). It gave a well-defined rotation period of 6.953±0.003 hours with a brightness variation of 0.25 magnitude ({{{1}}}),[10] superseding a period of 5.78±0.03 hours previously obtained by French astronomer René Roy in 2005 ({{{1}}}).[9]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1940 Whipple (1975 CA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001940. Retrieved 2 July 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1940) Whipple". Dictionary of Minor Planet Names – (1940) Whipple. Springer Berlin Heidelberg. p. 156. doi:10.1007/978-3-540-29925-7_1941. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (1940) Whipple". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1940%7CWhipple. Retrieved 25 September 2016.
- ↑ 4.0 4.1 4.2 4.3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 25 September 2016.
- ↑ 5.0 5.1 5.2 5.3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 17 October 2019.
- ↑ 6.0 6.1 6.2 6.3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
- ↑ 7.0 7.1 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 1 September 2016.
- ↑ 8.0 8.1 8.2 8.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 9.0 9.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1940) Whipple". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001940. Retrieved 25 September 2016.
- ↑ 10.0 10.1 Durkee, Russell I. (April 2012). "Lightcurves of 1940 Whipple and (6823) 1988 ED1". The Minor Planet Bulletin 39 (2): 92–93. ISSN 1052-8091. Bibcode: 2012MPBu...39...92D. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39...92D. Retrieved 25 September 2016.
- ↑ 11.0 11.1 11.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 25 September 2016.
- ↑ 12.0 12.1 "1940 Whipple (1975 CA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1940. Retrieved 25 September 2016.
- ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. https://archive.org/details/dictionaryminorp2008schm.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1940 Whipple at AstDyS-2, Asteroids—Dynamic Site
- 1940 Whipple at the JPL Small-Body Database
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