(457175) 2008 GO98
| Discovery [1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 8 April 2008 |
| Designations | |
| (457175) 2008 GO98 | |
| 2008 GO98 · 362P | |
| main-belt · (outer) [2] main-belt comet [3][4] Hilda [1][5] | |
| Orbital characteristics [2] | |
| Epoch 4 December 2015 (JD 2457360.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 16.05 yr (5,862 d) |
| Aphelion | 5.0787 AU |
| Perihelion | 2.8506 AU |
| 3.9646 AU | |
| Eccentricity | 0.2810 |
| 7.89 yr (2,883 d) | |
| 327.18° | |
| 0° 7m 29.64s / day | |
| Inclination | 15.569° |
| 192.61° | |
| 53.287° | |
| Jupiter MOID | 0.3592 AU |
| TJupiter | 2.9260 |
| Physical characteristics | |
| 5.5–24.7 km (est.)[6] 14.64 h (calculated)[5] | |
| 10.74±0.01 h[5][a] | |
| 0.057 (assumed)[5] | |
| C (assumed)[5] | |
| 12.9[1][2][5] 15.1[4] | |
(457175) 2008 GO98, provisional designation 2008 GO98 with cometary number 362P, is a Hildian asteroid and rare main-belt comet from the outermost regions of the asteroid belt, approximately 15 kilometers (9 miles) in diameter. It was discovered on 8 April 2008, by astronomers of the Spacewatch program at Kitt Peak National Observatory near Tucson, Arizona, in the United States.[1] The presumably carbonaceous body has a rotation period of 10.7 hours.[5]
Orbit and classification
2008 GO98 is classified as a member of the dynamical Hilda group,[5] as well as a main-belt comet that shows clear cometary activity,[3][6] which has also been described as a "quasi Hilda comet".[4] Orbital backward integration suggests that it might have been a centaur or trans-Neptunian object that ended its dynamical evolution as a quasi Hilda comet.[4]
It orbits the Sun in the outer asteroid belt at a distance of 2.9–5.1 AU once every 7 years and 11 months (2,883 days; semi-major axis of 3.96 AU). Its orbit has an eccentricity of 0.28 and an inclination of 16° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken by the Sloan Digital Sky Survey in October 2001, more than 5 years prior to its official discovery observation by Spacewatch.[1]
2008 GO98 has a Jupiter Tisserand's parameter (TJ) of 2.926,[2] just below Jewitt's threshold of 3, which serves as a distinction between the main-belt asteroids (TJ larger than 3) and the Jupiter-family comets (TJ between 2 and 3).[7]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 16 February 2016 (M.P.C. 98587).[8] As of 2018, it has not been named.[1]
Physical characteristics
2008 GO98 is an assumed C-type asteroid.[5]
Rotation period
In August 2017, a rotational lightcurve of 2008 GO98 was obtained from photometric observations by American astronomer Brian Warner at the Palmer Divide Station (U82) in California. Lightcurve analysis gave a rotation period of 10.74±0.01 hours with a small brightness amplitude of 0.12 magnitude (U=2).[5][a]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous body of 0.057 and calculates a diameter of 14.64 kilometers based on an absolute magnitude of 12.9.[5] Other estimates, taking into account several published magnitude measurements and a large range of albedo assumptions, estimate a diameter range of 5.5 to 24.7 kilometers.[6]
Notes
- ^ a b Lightcurve plot of (457175) 2008 GO98, by B. D Warner, at CS3 (2017). Rotation period 10.74±0.01 hours with a brightness amplitude of 0.12±0.02 mag. Quality Code is 2. Summary figures at the LCDB.
References
- ^ a b c d e f "457175 (2008 GO98)". Minor Planet Center. Retrieved 14 February 2018.
- ^ a b c d e "JPL Small-Body Database Browser: 457175 (2008 GO98)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 15 September 2018.
- ^ a b "MPEC 2017-N50 : COMETARY ACTIVITY IN (457175) 2008 GO98". Minor Planet Center. Retrieved 14 February 2018.
- ^ a b c d Gil-Hutton, R.; García-Migani, E. (May 2016). "Comet candidates among quasi-Hilda objects" (PDF). Astronomy and Astrophysics. 590: 5. Bibcode:2016A&A...590A.111G. doi:10.1051/0004-6361/201628184. Retrieved 14 February 2018.
- ^ a b c d e f g h i j k "LCDB Data for (457175)". Asteroid Lightcurve Database (LCDB). Retrieved 14 February 2018.
- ^ a b c "362P/2008 GO98". Asteroid-Analytics. 21 July 2017. Retrieved 14 February 2018.
- ^ David Jewitt. "The Tisserand Parameter". Retrieved 15 September 2018.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 February 2018.
External links
- COMETARY ACTIVITY IN (457175) 2008 GO98, Minor Planet Electronic Circular, Minor Planet Center
- It's an Asteroid, It's a Comet, It's… well, Both for Now!, Catalina Sky Survey, Lunar and Planetary Laboratory
- Cometary activity in (457175) 2008 GO98, The Virual Telescope, 23 August 2017
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (455001)-(460000) – Minor Planet Center
- (457175) 2008 GO98 at AstDyS-2, Asteroids—Dynamic Site
- (457175) 2008 GO98 at the JPL Small-Body Database