Astronomy:(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 | |
| Minor planet category | 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) |
| |{{{apsis}}}|helion}} | 5.0787 AU |
| |{{{apsis}}}|helion}} | 2.8506 AU |
| 3.9646 AU | |
| Eccentricity | 0.2810 |
| Orbital period | 7.89 yr (2,883 d) |
| Mean anomaly | 327.18° |
| Mean motion | 0° 7m 29.64s / day |
| Inclination | 15.569° |
| Longitude of ascending node | 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] |
| Rotation period | 10.74±0.01 h[4][lower-alpha 1] |
| Geometric albedo | 0.057 (assumed)[4] |
| C (assumed)[4] | |
| Absolute magnitude (H) | 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]
Orbit and classification
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]
Numbering and naming
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]
Physical characteristics
2008 GO98 is an assumed C-type asteroid.[4]
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 ({{{1}}}).[4][lower-alpha 1]
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.[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]
Notes
- ↑ 1.0 1.1 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "457175 (2008 GO98)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=457175. Retrieved 12 December 2020.
- ↑ 2.0 2.1 2.2 2.3 2.4 "JPL Small-Body Database Browser: 457175 (2008 GO98)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2457175. Retrieved 15 September 2018.
- ↑ 3.0 3.1 3.2 3.3 Gil-Hutton, R.; García-Migani, E. (May 2016). "Comet candidates among quasi-Hilda objects". Astronomy and Astrophysics 590: 5. doi:10.1051/0004-6361/201628184. Bibcode: 2016A&A...590A.111G. https://www.aanda.org/articles/aa/pdf/2016/06/aa28184-16.pdf. Retrieved 14 February 2018.
- ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 "LCDB Data for (457175)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=457175%7C. Retrieved 14 February 2018.
- ↑ 5.0 5.1 5.2 "362P/2008 GO98". Asteroid-Analytics. 21 July 2017. https://asteroidanalytics.com/2008go98/. Retrieved 14 February 2018.
- ↑ "MPEC 2017-N50 : COMETARY ACTIVITY IN (457175) 2008 GO98". Minor Planet Center. https://www.minorplanetcenter.net/mpec/K17/K17N50.html. 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. doi:10.1007/s10569-022-10094-4. Bibcode: 2022CeMDA.134...38D.
- ↑ David Jewitt. "The Tisserand Parameter". http://www2.ess.ucla.edu/~jewitt/tisserand.html. Retrieved 15 September 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 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 )
- 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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