31824 Elatus
31824 Elatus (/ˈɛlətəs/; provisional designation 1999 UG5) is a very red centaur from the outer Solar System, approximately 48 kilometers (30 miles) in diameter. It was discovered on 29 October 1999, by astronomers of the Catalina Sky Survey at Mount Lemmon Observatory in Arizona, United States. The minor planet was named after Elatus, a centaur from Greek mythology.
Hubble Space Telescope image of Elatus taken in 2009 | |
| Discovery | |
|---|---|
| Discovered by | Catalina Sky Srvy. |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 29 October 1999 |
| Designations | |
MPC designation | (31824) Elatus |
| Pronunciation | /ˈɛlətəs/ |
Named after | Elatus (Greek mythology) |
Alternative designations | 1999 UG5 |
Minor planet category | centaur · distant |
| Symbol | or (astrological) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 10.58 yr (3,864 days) |
| Aphelion | 16.298 AU |
| Perihelion | 7.3239 AU |
Semi-major axis | 11.811 AU |
| Eccentricity | 0.3799 |
Orbital period (sidereal) | 40.59 yr (14,826 days) |
Mean anomaly | 170.74° |
Mean motion | 0° 1m 27.48s / day |
| Inclination | 5.2447° |
Longitude of ascending node | 87.158° |
| 281.62° | |
| Physical characteristics | |
Mean diameter | 45.87 km (derived) 49.8±10.4 km 57.000±15.900 km |
Synodic rotation period | 26.5 h 26.82 h |
| 0.049±0.028 0.050±0.028 0.057 (assumed) | |
| RR B–V = 1.020±0.060 V–R = 0.620±0.048 | |
| 10.1 · 10.32 · 10.40±0.09 · 10.42 · 10.439±0.107 (R) · 10.49 · 10.61 | |
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