(505448) 2013 SA100

(505448) 2013 SA100, provisional designation 2013 SA100 and also known as o3l79,[2] is a trans-Neptunian object from the classical Kuiper belt in the outermost region of the Solar System. It was discovered on 5 August 2013, by astronomer with the Outer Solar System Origins Survey at the Mauna Kea Observatories, Hawaii, in the United States.[1] The classical Kuiper belt object belongs to the hot population and is a weak dwarf planet candidate, approximately 260 kilometers (160 miles) in diameter.

(505448) 2013 SA100
Discovery[1]
Discovered byOSSOS
Discovery siteMauna Kea Obs.
Discovery date5 August 2013
Designations
(505448) 2013 SA100
2013 SA100 · o3l79[2]
TNO[3] · cubewano[4]
p-DP[5] · distant[1]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 4 · 3[1]
Observation arc4.07 yr (1,486 d)
Aphelion53.810 AU
Perihelion38.607 AU
46.209 AU
Eccentricity0.1645
314.12 yr (114,732 d)
249.56°
0° 0m 11.16s / day
Inclination8.4892°
27.788°
114.99°
Physical characteristics
Mean diameter
255 km (est.)[5]
267 km (est.)[4]
0.08 (assumed)[5]
0.09 (assumed)[4]
g–r = 0.61[2]
r–z = 0.47[2]
6.1[1][3]

    Orbit and classification

    It orbits the Sun at a distance of 38.6–53.8 AU once every 314 years and 1 month (114,732 days; semi-major axis of 46.21 AU). Its orbit has an eccentricity of 0.16 and an inclination of 8° with respect to the ecliptic.[3] The body's observation arc begins with its official discovery observation at Mauna Kea Observatories in August 2013.[1]

    As a cubewano, also known as classical Kuiper belt object,[4] 2013 SA100 is located in between the resonant plutino and twotino populations and has a low-eccentricity orbit. With an inclination above 8°, it belongs to the "stirred" hot population rather than to the cold population with lower inclinations.[2]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 4 November 2017 and received the number 505448 in the minor planet catalog (M.P.C. 107067).[6] As of 2018, it has not been named.[1]

    Physical characteristics

    According to the American astronomer Michael Brown, 2013 SA100 measures 255 kilometers in diameter based on an assumed albedo of 0.08.[5] On his website, Brown lists this object as a "possible" dwarf planet (200–400 km), which is the category with the lowest certainty in his 5-class taxonomic system.[5] Similarly, Johnston's archive estimates a diameter 267 kilometers using an albedo of 0.09.[4]

    Spectroscopic measurements by the OSSOS team at the Gemini Observatory and with the Subaru Telescope gave a g–r and r–z color index of 0.61 and 0.47, respectively.[2] As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[3][7]

    References
    1. "505448 (2013 SA100)". Minor Planet Center. Retrieved 2 December 2018.
    2. Pike, Rosemary E.; Fraser, Wesley C.; Schwamb, Megan E.; Kavelaars, J. J.; Marsset, Michael; Bannister, Michele T.; et al. (September 2017). "Col-OSSOS: z-Band Photometry Reveals Three Distinct TNO Surface Types". The Astronomical Journal. 154 (3): 8. arXiv:1708.03079. Bibcode:2017AJ....154..101P. doi:10.3847/1538-3881/aa83b1. S2CID 3522138.
    3. "JPL Small-Body Database Browser: 505448 (2013 SA100)" (2017-08-30 last obs.). Jet Propulsion Laboratory. Retrieved 2 December 2018.
    4. Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 1 December 2018.
    5. Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 1 December 2018.
    6. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 2 December 2018.
    7. "LCDB Data for (505448)". Asteroid Lightcurve Database (LCDB). Retrieved 2 December 2018.

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