(15788) 1993 SB
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Discovery
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| Discovered by | Iwan P. Williams, Alan Fitzsimmons, and Donal O'Ceallaigh |
| Discovery date | September 16, 1993 |
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Designations
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| Alternative names | none |
| Minor planet category |
Plutino |
| Epoch March 6, 2006 (JD 2453800.5) | |
| Aphelion | 7,715.1 Gm (51.572 AU) |
| Perihelion | 3,997.1 Gm (26.719 AU) |
| Semi-major axis | 5,856.2 Gm (39.146 AU) |
| Eccentricity | 0.317 |
| Orbital period | 89,461 d (244.93 a) |
| Average orbital speed | 4.64 km/s |
| Mean anomaly | 335.2° |
| Inclination | 1.9° |
| Longitude of ascending node | 354.9° |
| Argument of perihelion | 79.5° |
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Physical characteristics
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| Dimensions | 130? km |
| Mass | ~2×1018 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | ~0.04 m/s² |
| Escape velocity | ~0.07 km/s |
| Sidereal rotation period |
? d |
| Albedo | 0.09? |
| Temperature | ~44 K |
| Spectral type | ? |
| Absolute magnitude | 7.7 |
(15788) 1993 SB is a trans-Neptunian object of the plutino class. Apart from Pluto, it was one of the first such objects discovered (beaten by two days by 1993 RO and by one day by 1993 RP), and the first to have an orbit calculated well enough to receive a number. The discovery was made in 1993 at the La Palma Observatory with the Isaac Newton Telescope. Very little is known about the object. Even the diameter estimate of ~130 km is based on the guess of an albedo of 0.09 [1].
[edit] External links
- First MPEC listing
- MPEC: recovery of the object
- list of known TNOs, including size estimates
- IAU minor planet lists
- Orbital simulation from JPL (Java) / Ephemeris
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