(457175) 2008 GO98

(457175) 2008 GO₉₈
362P/2008 GO₉₈

Discovery[1]
Discovered by	Spacewatch
Discovery site	Kitt Peak National Obs.
Discovery date	8 April 2008
Designations
MPC designation	(457175) 2008 GO98
Alternative designations	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)
Aphelion	5.0787 AU
Perihelion	2.8506 AU
Semi-major axis	3.9646 AU
Eccentricity	0.2810
Orbital period (sidereal)	7.89 yr (2,883 d)
Mean anomaly	327.18°
Mean motion	0° 7^m 29.64^s / day
Inclination	15.569°
Longitude of ascending node	192.61°
Argument of perihelion	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]
Synodic rotation period	10.74±0.01 h[4][a]
Geometric albedo	0.057 (assumed)[4]
Spectral type	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 (T_J) of 2.926,^[2] just below Jewitt's threshold of 3, which serves as a distinction between the main-belt asteroids (T_J larger than 3) and the Jupiter-family comets (T_J 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][a]

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.

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
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (457175) 2008 GO98 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters