(7888) 1993 UC
| Discovery[1] | |
|---|---|
| Discovered by | Robert H. McNaught |
| Discovery date | 20 October 1993 |
| Designations | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 9456 days (25.89 yr) |
| Aphelion | 4.0540 AU (606.47 Gm) (Q) |
| Perihelion | 0.81827 AU (122.411 Gm) (q) |
| 2.4361 AU (364.44 Gm) (a) | |
| Eccentricity | 0.66411 (e) |
| 3.80 yr (1388.8 d) | |
| 274.28° | |
| 0° 15m 33.156s / day | |
| Inclination | 26.082° |
| 165.92° | |
| 323.07° | |
| Earth MOID | 0.0889665 AU (13.30920 Gm) |
| Physical characteristics | |
| ~2.7 km (1.7 mi)[2] | |
Equatorial escape velocity | ~1.3 m/s (3 mph) |
| 2.340 h (0.0975 d)[1] | |
| U | |
| 14.1 (2013 peak)[3] | |
| 15.1[1] | |
(7888) 1993 UC is a near-Earth minor planet in the Apollo group.[1] It was discovered by Robert H. McNaught at the Siding Spring Observatory in Coonabarabran, New South Wales, Australia, on 20 October 1993.[1] The asteroid has an observation arc of 34 years and has a well determined orbit.[1] Its estimated size is 2.3 to 5.2 km.[4]
On 20 March 2013, the asteroid passed 49 lunar distances or 0.12598 AU (18,846,000 km; 11,711,000 mi) from Earth at a relative velocity of 21.8 km/s (49,000 mph).[1] The approach posed no threat to Earth. (7888) 1993 UC is not classified as a potentially hazardous asteroid (PHA) because its Earth MOID (Minimum Orbit Intersection Distance) is only 0.084 AU,[1] and only objects with an Earth MOID less than 0.05 AU are considered PHAs.[5]
It was discovered to be a binary asteroid by Arecibo Observatory in March 2013.[6]
References
[edit ]- ^ a b c d e f g h i j "JPL Close-Approach Data: 7888 (1993 UC)" . Retrieved 11 April 2016.
2012年11月25日 last obs (arc=23 years)
- ^ (E.A.R.N.) physical data for (7888) 1993UC
- ^ "1993 UC Ephemerides for 20 March 2013". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 19 March 2013.
- ^ NASA "NEO Earth Close Approach Tables", Retrieved on 21 December 2012.
- ^ NASA/JPL "NEO Program FAQ", Retrieved on 21 December 2012.
- ^ Dr. Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 1 March 2014.
External links
[edit ]- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- (7888) 1993 UC at NeoDyS-2, Near Earth Objects—Dynamic Site
- (7888) 1993 UC at ESA–space situational awareness
- (7888) 1993 UC at the JPL Small-Body Database
