2012 DR30

2012 DR30 is a trans-Neptunian object and centaur from the scattered disk and/or inner Oort cloud, located in the outermost region of the Solar System. The object with a highly eccentric orbit of 0.99 was first observed by astronomers with the Spacewatch program at Steward Observatory on 31 March 2009.[2] It measures approximately 188 kilometers (120 miles) in diameter.

2012 DR30
Discovery [1][2][3]
Discovered bySpacewatch
Discovery siteKitt Peak Obs.
Discovery date31 March 2009
(first observed only)
Designations
2012 DR30
  • 2012 DR30
  • 2009 FW54
Orbital characteristics [1][lower-alpha 1]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 1
Observation arc14.72 yr (5,375 d)
Aphelion3192.32 AU
Perihelion14.570 AU
1603.44 AU
Eccentricity0.9909
64207.87 yr (23,451,926 d)
0.0453°
0° 0m 0s / day
Inclination77.986°
341.48°
195.57°
Jupiter MOID9.311 AU
Saturn MOID5.45 AU[2]
Uranus MOID3.32 AU[2]
TJupiter0.9860
Physical characteristics
Mean diameter
19.9[7]
7.1[1][2]

    Description

    Using an epoch of February 2017, it has the second-largest heliocentric semi-major axis of a minor planet not detected out-gassing like a comet.[8] (2014 FE72 has a larger heliocentric semi-major axis.) 2012 DR30 does have a barycentric semi-major axis of 1032 AU.[9][lower-alpha 1] For the epoch of July 2018 2012 DR30 will have its largest heliocentric semi-major axis of 1644 AU.

    Orbital evolution
    Year[lower-alpha 1]
    (epoch)    		Barycentric
    Aphelion (Q)
    (AU)    		Orbital
    period
    years
    1950200032000
    2050204933100

    2012 DR30 passed 5.7 AU from Saturn in February 2009 and came to perihelion in March 2011 at a distance of 14.5 AU from the Sun (inside the orbit of Uranus).[1] In 2018, it will move from 18.2 AU to 19.1 AU from the Sun.[7] It comes to opposition in late March. With an absolute magnitude (H) of 7.1,[2] the object has a published diameter of 185 and 188 kilometers, respectively.[5][6]

    With an observation arc of 14.7 years,[1] it has a well constrained orbit. It will not be 50 AU from the Sun until 2047. After leaving the planetary region of the Solar System, 2012 DR30 will have a barycentric aphelion of 2049 AU with an orbital period of 33100 years.[lower-alpha 1] In a 10 million year integration of the orbit, the nominal (best-fit) orbit and both 3-sigma clones remain outside 12.2 AU (qmin) from the Sun.[4] Summary of barycentric orbital parameters are:

    Archived data from the JPL SBDB and MPC.[lower-alpha 2][lower-alpha 3]

    Comparison
    Sedna compared to some other very distant orbiting bodies including 2015 DB216 (orbit wrong), 2000 OO67, 2004 VN112, 2005 VX3, 2006 SQ372, 2007 TG422, 2007 DA61, 2009 MS9, 2010 GB174, 2010 NV1, 2010 BK118, 2012 DR30, 2012 VP113, 2013 BL76, 2013 AZ60, 2013 RF98, 2015 ER61

    See also

    Notes
    1. Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the semi-major axis and orbital period. For objects at such high eccentricity, the Sun's barycenter is more stable than heliocentric coordinates.[10] Using JPL Horizons, the barycentric semi-major axis is approximately 1032 AU.[9]

    References
    1. "JPL Small-Body Database Browser: (2012 DR30)" (2014-12-17 last obs.). Jet Propulsion Laboratory. Retrieved 19 November 2018.
    2. "2012 DR30". Minor Planet Center. Retrieved 19 November 2018.
    3. Ernesto Guido; Giovanni Sostero & Nick Howes (27 February 2012). "Trans-Neptunian Object 2012 DR30". Remanzacco Observatory in Italy. Retrieved 25 August 2013.
    4. Marc W. Buie. "Orbit Fit and Astrometric record for 12DR30". SwRI – Space Science Department. Archived from the original on 5 February 2016. Retrieved 1 February 2016.
    5. Kiss, Cs.; Szabó, Gy.; Horner, J.; Conn, B. C.; Müller, T. G.; Vilenius, E.; et al. (July 2013). "A portrait of the extreme solar system object 2012 DR30". Astronomy and Astrophysics. 555: 13. arXiv:1304.7112. Bibcode:2013A&A...555A...3K. doi:10.1051/0004-6361/201321147.
    6. Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 19 November 2018.
    7. "AstDyS 2012DR30 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 14 February 2017. (Distance to Sun [R] from first day of 2016 to first day of 2020. Assuming average apparent magnitude for 2017.)
    8. "JPL Small-Body Database Search Engine: Asteroids and a > 100 (AU)". JPL Solar System Dynamics. Retrieved 15 October 2014.
    9. Horizons output. "Barycentric Osculating Orbital Elements for 2012 DR30". Retrieved 6 March 2014. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)
    10. Kaib, Nathan A.; Becker, Andrew C.; Jones, R. Lynne; Puckett, Andrew W.; Bizyaev, Dmitry; Dilday, Benjamin; et al. (April 2009). "2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud". The Astrophysical Journal. 695 (1): 268–275. arXiv:0901.1690. Bibcode:2009ApJ...695..268K. doi:10.1088/0004-637X/695/1/268.
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