(532037) 2013 FY27

(532037) 2013 FY27 is a trans-Neptunian object and binary system that belongs to the scattered disc (like Eris).[8] Its discovery was announced on 31 March 2014.[1] It has an absolute magnitude (H) of 3.2.[3] 2013 FY27 is a binary object, with two components approximately 740 kilometres (460 mi) and 190 kilometres (120 mi) in diameter. It is the ninth-intrinsically-brightest known trans-Neptunian object,[9] and is approximately tied (to within measurement uncertainties) as the largest unnamed object in the Solar System.

(532037) 2013 FY27
2013 FY27 and its satellite, imaged by the Hubble Space Telescope on 15 January 2018
Discovery[1]
Discovered by
Discovery date17 March 2013
(announced on 31 March 2014)
Designations
2013 FY27
Orbital characteristics[3]
Epoch 31 May 2020 (JD 2458900.5)
Uncertainty parameter 4
Observation arc2585 days (7.08 yr)
Earliest precovery date15 March 2011 (Pan-STARRS)
Aphelion82.07455 AU (12.278178 Tm)
Perihelion35.24656 AU (5.272810 Tm)
58.66055 AU (8.775493 Tm)
Eccentricity0.39914
449.29 yr (164,103 d)
214.95673° (M)
0° 0m 7.897s /day
Inclination33.1626°
187.0246°
≈ November 2202[4]
±4 months
139.0775°
Known satellites1 [5][6][7]
Physical characteristics
Mean diameter
765+80
−85 km (effective diameter)[5]
742+78
−83 km (primary)[lower-alpha 1][5]
0.170+0.045
−0.030[5]
22.1

    Orbit
    Orbit of 2013 FY27

    2013 FY27 orbits the Sun once every 449 years. It will come to perihelion around November 2022,[4][lower-alpha 2] at a distance of about 35.6 AU. It is currently near aphelion, 80 AU from the Sun, and, as a result, it has an apparent magnitude of 22.[1] Its orbit has a significant inclination of 33°.[3] The sednoid 2012 VP113 and the scattered-disc object 2013 FZ27 were discovered by the same survey as 2013 FY27 and were announced within about a week of one another.

    Physical properties

    2013 FY27 has a diameter of about 740 kilometres (460 mi), placing it at a transition zone between medium-sized and large TNOs. Using the Atacama Large Millimeter Array and Magellan Telescopes, its albedo was found to be 0.17, and its colour to be moderately red. 2013 FY27 is one of the largest moderately red TNOs. The physical processes that lead to a lack of such moderately red TNOs larger than 800 kilometres (500 mi) are not yet well understood.

    The brightness of 2013 FY27 varies by less than 0.06 mag over hours and days, suggesting that it either has a very long rotation period, an approximately spheroidal shape, or a rotation axis pointing towards Earth.[5]

    Brown estimated, prior to the discovery of its satellite, that 2013 FY27 was very likely to be a dwarf planet, due to its large size.[10] However, Grundy et al. calculate that bodies such as 2013 FY27, less than about 1000 km in diameter, with albedos less than ≈0.2 and densities of ≈1.2 g/cm3 or less, may retain a degree of porosity in their physical structure, having never collapsed into fully solid bodies.[11]

    Satellite
    Animation of 2013 FY27 and its satellite, imaged by the Hubble Space Telescope from January to July 2018

    Using Hubble Space Telescope observations taken in January 2018, Scott Sheppard found a satellite around 2013 FY27, 0.17 arcseconds away and 3.0±0.2 mag fainter than the primary. The discovery was announced on 10 August 2018.[12] Assuming the two components have equal albedos, they are about 740 kilometres (460 mi) and 190 kilometres (120 mi) in size, respectively.[5] Follow up observations were taken between May and July 2018 in order to determine the orbit of the satellite,[6] but the results of those observations have not yet been released. Once the orbit is known, the masses and densities of the two components can be determined.

    See also

    Notes
    1. Assuming the two components have equal albedos
    2. The uncertainty in the time of perihelion passage is ≈1 month (1-sigma) or 3.6 months (3-sigma).[3]

    References
    1. "MPEC 2014-F82 : 2013 FY27". IAU Minor Planet Center. 31 March 2014. Retrieved 29 March 2018. (K13F27Y)
    2. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2 April 2014.
    3. "JPL Small-Body Database Browser: (2013 FY27)" (last observation: 2018-04-12; arc: 7.08 years). Jet Propulsion Laboratory. Retrieved 20 February 2020.
    4. JPL Horizons Observer Location: @sun (perihelion occurs when deldot changes from negative to positive)
    5. Sheppard, Scott; Fernandez, Yanga; Moullet, Arielle (6 September 2018). "The Albedos, Sizes, Colors and Satellites of Dwarf Planets Compared with Newly Measured Dwarf Planet 2013 FY27". The Astronomical Journal. 156 (6): 270. arXiv:1809.02184. Bibcode:2018AJ....156..270S. doi:10.3847/1538-3881/aae92a.
    6. Scott Sheppard (21 March 2018). "The Orbit of the Newly Discovered Satellite around the Dwarf Planet 2013 FY27 - HST Proposal 15460". Retrieved 9 September 2018.
    7. Scott Sheppard (7 April 2017). "A Satellite Search of a Newly Discovered Dwarf Planet – HST Proposal 15248". Retrieved 9 September 2018.
    8. Lakdawalla, Emily (2 April 2014). "More excitement in the outermost solar system: 2013 FY27, a new dwarf planet". www.planetary.org/blogs. The Planetary Society. Retrieved 18 January 2017.
    9. "JPL Small-Body Database Search Engine: orbital class (TNO) and H < 3.2 (mag)". JPL Solar System Dynamics. Retrieved 1 June 2019.
    10. Mike Brown, How many dwarf planets are there in the outer solar system? Archived 18 October 2011 at the Wayback Machine (assumes H = 3.3)
    11. W.M. Grundy, K.S. Noll, M.W. Buie, S.D. Benecchi, D. Ragozzine & H.G. Roe, 'The Mutual Orbit, Mass, and Density of Transneptunian Binary Gǃkúnǁʼhòmdímà ((229762) 2007 UK126)', Icarus Archived 7 April 2019 at the Wayback Machine doi: 10.1016/j.icarus.2018.12.037,
    12. "CBET 4537: 2013 FY27". cbat.eps.harvard.edu. 10 August 2018. Retrieved 9 September 2018.
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