(457175) 2008 GO98

(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]

(457175) 2008 GO98
362P/2008 GO98
Discovery[1]
Discovered bySpacewatch
Discovery siteKitt Peak National Obs.
Discovery date8 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 arc16.05 yr (5,862 d)
Aphelion5.0787 AU
Perihelion2.8506 AU
3.9646 AU
Eccentricity0.2810
7.89 yr (2,883 d)
327.18°
0° 7m 29.64s / day
Inclination15.569°
192.61°
53.287°
Jupiter MOID0.3592 AU
TJupiter2.9260
Physical characteristics
Mean diameter
5.5–24.7 km (est.)[5]
14.64 h (calculated)[4]
10.74±0.01 h[4][lower-alpha 1]
0.057 (assumed)[4]
C (assumed)[4]
12.9[1][2][4]
15.1[3]

    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 (U=2).[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. 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. "457175 (2008 GO98)". Minor Planet Center. Retrieved 12 December 2020.
    2. "JPL Small-Body Database Browser: 457175 (2008 GO98)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 15 September 2018.
    3. 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.
    4. "LCDB Data for (457175)". Asteroid Lightcurve Database (LCDB). Retrieved 14 February 2018.
    5. "362P/2008 GO98". Asteroid-Analytics. 21 July 2017. Retrieved 14 February 2018.
    6. "MPEC 2017-N50 : COMETARY ACTIVITY IN (457175) 2008 GO98". Minor Planet Center. Retrieved 14 February 2018.
    7. 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.
    8. David Jewitt. "The Tisserand Parameter". Retrieved 15 September 2018.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 February 2018.

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