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Asteroid From Wikipedia, the free encyclopedia
9991 Anežka, provisional designation 1997 TY7, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter.
Discovery [1] | |
---|---|
Discovered by | Z. Moravec |
Discovery site | Kleť Obs. |
Discovery date | 5 October 1997 |
Designations | |
(9991) Anezka | |
Named after | Anežka Moravcová (discoverer's grandmother)[2] |
1997 TY7 · 1977 DX9 1983 GV1 · 1994 BZ | |
main-belt · Themis [3] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 40.19 yr (14,681 days) |
Aphelion | 3.7082 AU |
Perihelion | 2.6975 AU |
3.2028 AU | |
Eccentricity | 0.1578 |
5.73 yr (2,094 days) | |
356.19° | |
0° 10m 19.2s / day | |
Inclination | 2.1773° |
80.608° | |
115.62° | |
Physical characteristics | |
Dimensions | 7.92 km (calculated)[3] 12.293±0.294 km[4][5] |
4.4692±0.0019 h[6] | |
0.08 (assumed)[3] 0.097±0.013[4][5] | |
C [3] | |
12.7[4] · 13.3[1] · 13.415±0.003 (R)[6] · 13.86[3] · 13.89±0.32[7] | |
The asteroid was discovered on 5 October 1997, by Czech astronomer Zdeněk Moravec at the South Bohemian Kleť Observatory in the Czech Republic.[8] It was named after the discoverer's grandmother, Anežka Moravcová.[2]
Anežka is a carbonaceous asteroid and member of the Themis family, a dynamical family of outer main-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.7 AU once every 5 years and 9 months (2,094 days). Its orbit has an eccentricity of 0.16 and an inclination of 2° with respect to the ecliptic.[1] It was first identified as 1977 DX9 at the Japanese Kiso Observatory in 1977, extending the body's observation arc by 20 years prior to its discovery.[8]
A rotational lightcurve for this asteroid was obtained from photometric observations at the Palomar Transient Factory in December 2012. It gave it a rotation period of 4.4692±0.0019 hours with a brightness variation of 0.24 in magnitude (U=2).[6]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 12.3 kilometers in diameter and its surface has an albedo of 0.097,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 7.9 kilometers.[3]
This minor planet was named after the discoverer's grandmother, Anežka Moravcová (b 1924), on her 75th birthday.[2] The official naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34632).[9]
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