| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 8 April 2008 |
| Designations | |
| (457175) 2008 GO98 | |
| 2008 GO98 · 362P | |
| Jupiter family quasi-Hilda | |
| Orbital characteristics | |
| 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.) 14.64 h (calculated) | |
| 10.74±0.01 h | |
| 0.057 (assumed) | |
| C (assumed) | |
| 12.9 15.1 | |
(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. This presumably carbonaceous body has a diameter of approximately 15 kilometers (9 miles) and rotation period of 10.7 hours.
Orbit and classification
2008 GO98 is classified as a member of the dynamical Hilda group, as well as a Jupiter family that shows clear cometary activity, which has also been described as a "quasi-Hilda comet". 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. It may have reached the belt during the last few hundred years.
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. 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.
Although 2008 GO98 orbits in the asteroid belt, it has a Jupiter Tisserand's parameter (TJ) of 2.926, 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).
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 16 February 2016 (M.P.C. 98587). As of 2020, it has not been named.
Physical characteristics
2008 GO98 is an assumed C-type asteroid.
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).
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. 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.
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 12 December 2020.
- ^ 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 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.
- ^ "MPEC 2017-N50 : COMETARY ACTIVITY IN (457175) 2008 GO98". Minor Planet Center. Retrieved 14 February 2018.
- ^ de la Fuente Marcos, Raúl; de la Fuente Marcos, Carlos (15 July 2022). "Recent arrivals to the main asteroid belt". Celestial Mechanics and Dynamical Astronomy. 134 (5): 38. arXiv:2207.07013. Bibcode:2022CeMDA.134...38D. doi:10.1007/s10569-022-10094-4.
- ^ 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 Virtual Telescope, 23 August 2017
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- 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
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