(457175) 2008 GO98

(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]

(457175) 2008 GO98
Discovery [1]
Discovered bySpacewatch
Discovery siteKitt Peak National Obs.
Discovery date8 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 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.)[6]
14.64 h (calculated)[5]
10.74±0.01 h[5][lower-alpha 1]
0.057 (assumed)[5]
C (assumed)[5]
12.9[1][2][5]
15.1[4]

    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][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.[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
    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.
    gollark: You vastly underestimate their powers.
    gollark: Of course, they cannot be trusted.
    gollark: According to truth cuboctahedrons, yes.
    gollark: It's like they're using the majority of their computing power just to be mildly irritating.
    gollark: You'd think so, but we found that they were actually somehow able to look into the future to determine the actual intended question being asked, and then give the wrong answer.

    References
    1. "457175 (2008 GO98)". Minor Planet Center. Retrieved 14 February 2018.
    2. "JPL Small-Body Database Browser: 457175 (2008 GO98)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 15 September 2018.
    3. "MPEC 2017-N50 : COMETARY ACTIVITY IN (457175) 2008 GO98". Minor Planet Center. Retrieved 14 February 2018.
    4. 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.
    5. "LCDB Data for (457175)". Asteroid Lightcurve Database (LCDB). Retrieved 14 February 2018.
    6. "362P/2008 GO98". Asteroid-Analytics. 21 July 2017. Retrieved 14 February 2018.
    7. David Jewitt. "The Tisserand Parameter". Retrieved 15 September 2018.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 February 2018.

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