9991 Anežka
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Orbit comparison of 9991 Anežka (blue), inner planets (red) and Jupiter (outermost) | |
| Discovery [1] | |
|---|---|
| Discovered by | Klet |
| Discovery site | Kleť Observatory |
| Discovery date | 5 October 1997 |
| Designations | |
| MPC designation | 9991 Anezka |
Named after |
Anežka Moravcová (discoverer's family)[2] |
|
1997 TY7 · 1977 DX9 1983 GV1 · 1994 BZ | |
| main-belt (outer) · Themis [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.83 yr (14,181 days) |
| Aphelion | 3.7031 AU |
| Perihelion | 2.6987 AU |
| 3.2009 AU | |
| Eccentricity | 0.1568 |
| 5.73 yr (2,092 days) | |
| 218.38° | |
| Inclination | 2.1772° |
| 80.617° | |
| 115.70° | |
| Physical characteristics | |
| Dimensions | 7.92 km (calculated)[3] |
| 4.4692±0.0019 h[4] | |
| 0.08 (assumed)[3] | |
| C [3] | |
| 13.3[1] | |
|
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9991 Anežka, provisional designation 1997 TY7, is a carbonaceous asteroid from the outer region of the asteroid belt, about 8 kilometers in diameter. It was discovered on 5 October 1997, by Czech astronomer Zdeněk Moravec at the South Bohemian Kleť Observatory in the Czech Republic.[5]
The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-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 (2,092 days). Its orbit shows an eccentricity of 0.16 and an inclination of 2 degrees from the plane of the ecliptic.[1]
A photometric light-curve analysis at the Palomar Transient Factory in 2014, gave it a rotation period of 4.4692±0.0019 hours with a brightness amplitude of 0.24 in magnitude,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 for the asteroid's surface, a typical value for carbonaceous bodies.[3]
In 1999, the minor planet was named after the discoverer's grandmother, Anežka Moravcová (b 1924), on the occasion her 75th birthday.[2]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 9991 Anezka (1997 TY7)" (2015-12-18 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
- 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9991) Anežka. Springer Berlin Heidelberg. p. 716. ISBN 978-3-540-00238-3. Retrieved January 2016.
- 1 2 3 4 5 "LCDB Data for (9991) Anezka". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
- 1 2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved January 2016.
- ↑ "9991 Anezka (1997 TY7)". Minor Planet Center. Retrieved January 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 9991 Anežka at the JPL Small-Body Database
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