1995 GJ

1995 GJ
Discovery [1][2][3]
Discovered by D. Jewitt
J. Chen
Discovery site Mauna Kea Obs.
Discovery date 3 April 1995
Designations
MPC designation 1995 GJ
TNO? [1]
cubewano? (assumed)[4]
Orbital characteristics [1]
Epoch 4 April 1995 (JD 2449811.5)
Uncertainty parameter 9/E[2]
Observation arc 1 days
Aphelion 46 ± 38000 AU
Perihelion 39 ± 2000 AU
42 ± 35000 AU
Eccentricity 0.09 ± 771
Inclination 22 ± 10242°
338 ± 97°
Physical characteristics
Dimensions 170 km (est. at 0.10)[5]
176 km[4]
179 km[6]
0.08 (assumed)[6]
7.0[1][2]

    1995 GJ might be a trans-Neptunian object and/or high-inclination cubewano from the Kuiper belt in the outermost region of the Solar System, and based on the calculated distance and brightness is assumed to be approximately 175 kilometers in diameter. It is a lost minor planet that has only been observed six times on the nights of 3–4 April 1995, by David Jewitt and Jun Chen at the Mauna Kea Observatory, Hawaii, using the UH88 telescope, and has not been observed ever since.[2][3] The object is estimated to have been discovered right at perihelion (closest approach to the Sun).[1] On the night of discovery, the object is estimated to have been moving away from Earth at 16 km/s with the uncertainty in the velocity being an unrealistic ±238000 km/s (80% the speed of light).

    Orbit

    The nominal orbit of 1995 GJ suggests it orbits the Sun at a distance of 39–46 AU once every 281 years with an assumed eccentricity of 0.09 and an inclination of 23° with respect to the ecliptic. But 1995 GJ has the highest possible orbital uncertainty and thus very large uncertainties in the orbital elements.[1] With only a 1-day observation arc, the orbit is so poorly constrained as to be almost worthless. The eccentricity is listed as 0.09 ± 771,[1] even though realistically it will be less than 1.

    Otherwise known for their low inclinations, this cubewano may be the first of its kind to have an inclination greater than 20°.[7] But as a one-night stand with only 6 observations,[1] 1995 GJ has numerous orbits that fit the uncertainties in the very small dataset. 1995 GJ could be a Trans-Neptunian object, a centaur, or a much closer main belt asteroid 100 times smaller in diameter. As an example, 2004 PR107 (when it had a one-day observation arc) was though to be a potential trans-Neptunian dwarf planet, but is now known to be a small main belt asteroid.

    Using the nominal orbit with the assumed eccentricity,[3] 1995 GJ may come to opposition around mid March of each year at an apparent magnitude of 22.9.

    As of 2018, the uncertainty in the object's distance from the Sun is an unrealistic ±160 trillion km (17 ly).[8]

    Date Uncertainty in
    distance from the Sun
    1995-Apr±730 billion km
    1995-May±1 trillion km
    1996-Jul±10 trillion km
    2009-Jan±100 trillion km
    2026-Feb±200 trillion km

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: (1995 GJ)" (1995-04-04 last obs.). Jet Propulsion Laboratory. Archived from the original on 14 July 2012. Retrieved 3 August 2017.
    2. 1 2 3 4 "1995 GJ". Minor Planet Center. Retrieved 3 August 2017.
    3. 1 2 3 "MPEC 1995-G07: 1995 GJ". Minor Planet Center. 1995-04-07. Retrieved 3 August 2017.
    4. 1 2 "List of Known Trans-Neptunian Objects". Johnston's Archive. 22 July 2017. Archived from the original on 31 July 2002. Retrieved 2 August 2017.
    5. ↑ "Asteroid Size Estimator". CNEOS/JPL. Retrieved 2 August 2017.
    6. 1 2 "How many dwarf planets are there in the outer solar system?". Mike Brown. Retrieved 2 August 2017.
    7. ↑ Johnston "Archived copy". Archived from the original on 31 July 2002. Retrieved 2 August 2017.
    8. ↑ JPL Horizons: 1995 GJ (Soln.date: 2014-Feb-04)
      Observer Location: @sun
      Under "Table Settings" select "39. Range & range-rate". Uncertainty in distance (km) is RNG_3sigma

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