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Discovery
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|---|---|
| Discovered by | David C. Jewitt and Jane X. Luu, |
| Discovery date | September 14, 1993 |
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Designations
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| MPC designation | none |
| Alternate name(s) | 1993 RO |
| Minor planet category |
Plutino (TNO) |
| Epoch March 6, 2006 (JD 2453800.5) | |
| Aphelion | 6,975.4 Gm (46.628 AU) |
| Perihelion | 4,706.6 Gm (31.462 AU) |
| Semi-major axis | 5,841.0 Gm (39.045 AU) |
| Eccentricity | 0.194 |
| Orbital period | 89,114 d (243.98 a) |
| Average orbital speed | 4.72 km/s |
| Mean anomaly | 12.8° |
| Inclination | 3.7° |
| Longitude of ascending node | 170.4° |
| Argument of perihelion | 188.0° |
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Physical characteristics
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| Dimensions | 90? kmH |
| Mass | ~8×1017 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | ~0.03 m/s² |
| Escape velocity | ~0.05 km/s |
| Sidereal rotation period |
? d |
| Albedo | 0.09? |
| Temperature | ~45 K |
| Spectral type | ? |
| Absolute magnitude (H) | 8.4 |
1993 RO is a trans-Neptunian object of the plutino class. It was the first plutino discovered after Pluto itself, with 1993 RP and (15788) 1993 SB a day and two days behind. The discovery was made in 1993 at the Mauna Kea Observatory with a 2.2m telescope. Very little is known about the object. Even the diameter estimate of ~90 km is based on the guess of an albedo of 0.09 [1].
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