astro.wikisort.org - Asteroid

(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 by	OSSOS
Discovery site	Mauna Kea Obs.
Discovery date	5 August 2013
Designations
MPC designation	(505448) 2013 SA100
Alternative designations	2013 SA100 · o3l79[2]
Minor planet category	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 arc	4.07 yr (1,486 d)
Aphelion	53.810 AU
Perihelion	38.607 AU
Semi-major axis	46.209 AU
Eccentricity	0.1645
Orbital period (sidereal)	314.12 yr (114,732 d)
Mean anomaly	249.56°
Mean motion	0° 0m 11.16s / day
Inclination	8.4892°
Longitude of ascending node	27.788°
Argument of perihelion	114.99°
Physical characteristics
Mean diameter	255 km (est.)[5] 267 km (est.)[4]
Geometric albedo	0.08 (assumed)[5] 0.09 (assumed)[4]
Spectral type	g–r = 0.61[2] r–z = 0.47[2]
Absolute magnitude (H)	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

External links

• MPEC 2017-L32 : 2013 SA100, Minor Planet Electronic Circular, 4 June 2017
• List of Transneptunian Objects, Minor Planet Center
• Discovery Circumstances: Numbered Minor Planets (505001)-(510000) – Minor Planet Center
• (505448) 2013 SA100 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (505448) 2013 SA100 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

---