| 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 | |
| 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) |
| Aphelion | 4.3883 AU |
| Perihelion | 3.4843 AU |
| 3.9363 AU | |
| Eccentricity | 0.1148 |
| 7.81 yr (2,853 days) | |
| 295.10 ° | |
| 0° 7m 34.32s / day | |
| Inclination | 11.107° |
| 205.14° | |
| 268.81° | |
| Physical characteristics | |
| Dimensions | 35.914±0.244
[4] 36.78 km (calculated) [3] |
| 17.32±0.02 h [5] | |
| 0.055±0.013
[4] 0.057 (assumed) [3] | |
| D [6] · C [3] | |
| 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 ( U=3-). [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
- ^ a b c d e "JPL Small-Body Database Browser: 3202 Graff (A908 AA)" (2017-01-09 last obs.). Jet Propulsion Laboratory. Archived from the original on 15 September 2020. Retrieved 16 June 2017.
- ^ a b c d 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.
- ^ a b c d e f "LCDB Data for (3202) Graff". Asteroid Lightcurve Database (LCDB). Retrieved 10 July 2016.
- ^ a b c 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. arXiv: 1110.0283. Bibcode: 2012ApJ...744..197G. doi: 10.1088/0004-637X/744/2/197. S2CID 44000310. Retrieved 5 December 2016.
- ^ a b Stephens, Robert D. (January 2016). "Asteroids Observed from CS3: 2015 July - September". The Minor Planet Bulletin. 43 (1): 52–56. Bibcode: 2016MPBu...43...52S. ISSN 1052-8091. Retrieved 10 July 2016.
- ^ a b c 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. S2CID 53493339. Retrieved 10 July 2016.
- ^ a b "3202 Graff (A908 AA)". Minor Planet Center. Retrieved 10 July 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 July 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 (1)-(5000) – Minor Planet Center
- 3202 Graff at AstDyS-2, Asteroids—Dynamic Site
- 3202 Graff at the JPL Small-Body Database
