4257 Ubasti
| Discovery LD | |
|---|---|
| Physical characteristics | |
| Dimensions | 1.30±0.09 km[4] 1.96 km (calculated)[5] |
| 0.20 (assumed)[5] 0.376±0.053[4] | |
| S [5] | |
| 15.9[1][5] · 16.20[4] | |
4257 Ubasti, provisional designation 1987 QA, is a stony
Mars-crosser, approximately 1.5 kilometers in diameter. It was discovered by American astronomer Jean Mueller at the Palomar Observatory in California on 23 August 1987.[3] The asteroid was named for Bastet – also known as Baast, Ubaste or Ubasti – the Egyptian goddess of cats.[2]
Orbit and classification
Ubasti orbits the Sun at a distance of 0.9–2.4
precoveries were taken and no prior identification had been made.[3]
Close approaches
As a
potentially hazardous asteroid (0.05 AU; less than 20 LD).[1]
Physical characteristics
Ubasti is an assumed stony S-type asteroid.[5]
Rotation period
As of 2017, no rotational
rotation period remains unknown.[5] However, the Lowell Observatory Near-Earth Asteroid Photometric Survey has measured the body's brightness variation caused by its rotation, which gave a maximum of 0.36 magnitude. This indicates that the body has a somewhat non-spherical shape.[6]
Diameter and albedo
According to the survey carried out by the Japanese
albedo of 0.376,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.96 kilometers based on an absolute magnitude of 15.9.[5]
Naming
This
M.P.C. 19336).[7] The discoverer dedicated this asteroid to her beloved companion, Pepper Cat (1974–1991).[2]
References
- ^ a b c d e f "JPL Small-Body Database Browser: 4257 Ubasti (1987 QA)" (2016-08-30 last obs.). Jet Propulsion Laboratory. Retrieved 15 September 2017.
- ^ ISBN 978-3-540-00238-3.
- ^ a b c "4257 Ubasti (1987 QA)". Minor Planet Center. Retrieved 15 September 2017.
- ^ )
- ^ a b c d e f g "LCDB Data for (4257) Ubasti". Asteroid Lightcurve Database (LCDB). Retrieved 15 September 2017.
- ISSN 1052-8091. Retrieved 15 September 2017.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 September 2017.
External links
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- 4257 Ubasti at NeoDyS-2, Near Earth Objects—Dynamic Site
- 4257 Ubasti at ESA–space situational awareness
- 4257 Ubasti at the JPL Small-Body Database
