Astronomy:3202 Graff
| Discovery [1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 3 January 1908 |
| Designations | |
| (3202) Graff | |
| Named after | Gareth V. Williams (astronomer)[2] |
| A908 AA · 1981 ES13 | |
| Minor planet category | main-belt[1] · Hilda [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.02 yr (39,819 days) |
| |{{{apsis}}}|helion}} | 4.3883 AU |
| |{{{apsis}}}|helion}} | 3.4843 AU |
| 3.9363 AU | |
| Eccentricity | 0.1148 |
| Orbital period | 7.81 yr (2,853 days) |
| Mean anomaly | 295.10° |
| Mean motion | 0° 7m 34.32s / day |
| Inclination | 11.107° |
| Longitude of ascending node | 205.14° |
| 268.81° | |
| Physical characteristics | |
| Dimensions | 35.914±0.244[4] 36.78 km (calculated)[3] |
| Rotation period | 17.32±0.02 h[5] |
| Geometric albedo | 0.055±0.013[4] 0.057 (assumed)[3] |
| D [6] · C [3] | |
| Absolute magnitude (H) | 10.9[1][3] · 11.31±0.28[6] |
3202 Graff, provisional designation A908 AA, is a carbonaceous Hilda asteroid from the outermost region of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 3 January 1908, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[7] The asteroid was named after astronomer Gareth V. Williams.[2]
Orbit and classification
Graff belongs to the Hilda family of asteroids, which are in a 3:2 orbital resonance with the giant planet Jupiter. It orbits the Sun in the outer main-belt at a distance of 3.5–4.4 AU once every 7 years and 10 months (2,853 days). Its orbit has an eccentricity of 0.11 and an inclination of 11° with respect to the ecliptic.[1] The asteroid's observation arc begins 3 weeks after its discovery with its first used observation at Heidelberg.[7]
Physical characteristics
The dark C-type asteroid is classified as a rare D-type by Pan-STARRS' large-scale survey,[6]
In July 2015, a rotational lightcurve of Graff was obtained by astronomer Robert Stephens at the Center for Solar System Studies. It gave a well-defined rotation period of 17.32±0.02 hours with a brightness variation of 0.18 in magnitude ({{{1}}}).[5]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Graff measures 35.9 kilometers in diameter and its surface has an albedo of 0.055.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 36.8 kilometers with an absolute magnitude of 10.9.[3]
Naming
This minor planet was named after English-born astronomer Gareth "Graff" Vaughan Williams (born 1965), who identified various low-numbered asteroids among bodies that had been given provisional designations. His work at the Minor Planet Center (MPC) has received much recognition.[2]
The official naming citation was published by the Minor Planet Center on 10 April 1990 (M.P.C. 16245),[8] based on a suggestion by long-time MPC director Brian G. Marsden (1937–2000) and by Conrad M. Bardwell (1926–2010), associate director of the MPC and who made the identification for this body.[2] The minor planets 1615 Bardwell and 1877 Marsden were named in honor of these two prominent astronomers at the MPC.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 3202 Graff (A908 AA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003202.
- ↑ 2.0 2.1 2.2 2.3 Schmadel, Lutz D. (2007). "(3202) Graff". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 266. doi:10.1007/978-3-540-29925-7_3203. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (3202) Graff". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3202%7CGraff.
- ↑ 4.0 4.1 4.2 Grav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S. et al. (January 2012). "WISE/NEOWISE Observations of the Hilda Population: Preliminary Results". The Astrophysical Journal 744 (2): 15. doi:10.1088/0004-637X/744/2/197. Bibcode: 2012ApJ...744..197G. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...744..197G. Retrieved 5 December 2016.
- ↑ 5.0 5.1 Stephens, Robert D. (January 2016). "Asteroids Observed from CS3: 2015 July - September". The Minor Planet Bulletin 43 (1): 52–56. ISSN 1052-8091. Bibcode: 2016MPBu...43...52S. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...52S. Retrieved 10 July 2016.
- ↑ 6.0 6.1 6.2 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 10 July 2016.
- ↑ 7.0 7.1 "3202 Graff (A908 AA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=3202.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
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
- 3202 Graff at AstDyS-2, Asteroids—Dynamic Site
- 3202 Graff at the JPL Small-Body Database
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