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| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 8 April 2008 |
| Designations | |
| (457175) 2008 GO98 | |
| 2008 GO98 · 362P | |
| Jupiter family[2] [3] quasi-Hilda[1][4] | |
| 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 | |
Mean diameter | 5.5–24.7 km (est.)[5] 14.64 h (calculated)[4] |
| 10.74±0.01 h[4][a] | |
| 0.057 (assumed)[4] | |
| C (assumed)[4] | |
| 12.9[1][2][4] 15.1[3] | |
(457175) 2008 GO98, provisional designation 2008 GO98 with cometary number 362P, is a Jupiter family comet in a quasi-Hilda orbit within the outermost regions of the asteroid belt. 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] This presumably carbonaceous body has a diameter of approximately 15 kilometers (9 miles) and rotation period of 10.7 hours.[4]
2008 GO98 is classified as a member of the dynamical Hilda group,[4] as well as a Jupiter family that shows clear cometary activity,[6][5] which has also been described as a "quasi-Hilda comet".[3] 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.[3] It may have reached the belt during the last few hundred years.[7]
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]
Although 2008 GO98 orbits in the asteroid belt, it 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).[8]
This minor planet was numbered by the Minor Planet Center on 16 February 2016 (M.P.C. 98587).[9] As of 2020, it has not been named.[1]
2008 GO98 is an assumed C-type asteroid.[4]
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).[4][a]
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.[4] 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.[5]
