astro.wikisort.org - Asteroid

(91205) 1998 US₄₃, provisional designation 1998 US₄₃, is a resonant trans-Neptunian object of the plutino group, located in the Kuiper belt in the outermost region of the Solar System. The rather bluish body measures approximately 111 kilometers (69 miles) in diameter.[3] It was discovered on 22 October 1998, by American astronomer Marc Buie at the Kitt Peak National Observatory in the United States.[1] It is probably not a dwarf planet candidate.[4]

(91205) 1998 US₄₃

Discovery[1]
Discovered by	M. W. Buie
Discovery site	Kitt Peak National Obs.
Discovery date	22 October 1998
Designations
MPC designation	(91205) 1998 US43
Alternative designations	1998 US43
Minor planet category	TNO[2] · plutino[3] distant[1]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 4
Observation arc	17.29 yr (6,314 d)
Aphelion	44.196 AU
Perihelion	33.932 AU
Semi-major axis	39.064 AU
Eccentricity	0.1314
Orbital period (sidereal)	244.16 yr (89,179 d)
Mean anomaly	66.411°
Mean motion	0° 0m 14.4s / day
Inclination	10.628°
Longitude of ascending node	223.94°
Argument of perihelion	138.70°
Physical characteristics
Mean diameter	111 km (est.)[3] 154 km (est.)[4]
Geometric albedo	0.04 (assumed)[4] 0.09 (assumed)[3]
Spectral type	BB–BR[3] B–R = 1.185[5] B–V = 0.691[5] R–I = 0.323[5] V–R = 0.494[5]
Absolute magnitude (H)	8.0[1][2]

Classification and orbit

1998 US₄₃ belongs to the plutino population,[3] which are named after the group's largest member, Pluto. Plutinos are resonant trans-Neptunian objects in 2:3 resonance with Neptune, orbiting the Sun twice for every three orbits Neptune does.

It orbits the Sun at a distance of 33.9–44.2 AU once every 244 years and 2 months (89,179 days; semi-major axis of 39.06 AU). Its orbit has an eccentricity of 0.13 and an inclination of 11° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation. Its orbit still has a fair amount of uncertainty.[1]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 28 October 2004 (M.P.C. 52912).[6] As of 2018, it has not been named.[1]

Physical characteristics

Based on an absolute magnitude of 8.0 and an assumed albedo of 0.09, the Johnston's Archive estimates a diameter of 111 kilometers.[3] The body's spectrum (BB–BR) suggests a somewhat bluish color.[3] As of 2018, no rotational lightcurve of 1998 US₄₃ has been obtained from photometric observations.[2][7] 1998 US₄₃ it an unlikely dwarf planet candidate due to its small size, estimated by Michael Brown to measure 154 kilometers with a low albedo of 0.04.[4]

References

External links

• List Of Transneptunian Objects, Minor Planet Center
• List of Known Trans-Neptunian Objects, Johnston's Archive
• Discovery Circumstances: Numbered Minor Planets (90001)-(95000) – Minor Planet Center
• (91205) 1998 US43 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (91205) 1998 US43 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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- [en] (91205) 1998 US43

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[ru] (91205) 1998 US43

(91205) 1998 US43 — резонансный транснептуновый объект пояса Койпера, находящийся во внешней области Солнечной системы. Диаметр оценивается приблизительно в 111 км.[2] Объект был открыт 22 октября 1998 года американским астрономом Марком Буйе в Национальной обсерватории Китт-Пик, США.[3]

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