(15788) 1993 SB
|
|
| Discovery | |
|---|---|
| Discovered by |
Iwan P. Williams, Alan Fitzsimmons, and Donal O'Ceallaigh La Palma (950) |
| Discovery date | 16 September 1993 |
| Designations | |
| none | |
| Plutino | |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 5182 days (14.19 yr) |
| Aphelion | 51.860 AU (7.7581 Tm) |
| Perihelion | 26.727 AU (3.9983 Tm) |
| 39.294 AU (5.8783 Tm) | |
| Eccentricity | 0.31981 |
| 246.32 yr (89967.0 d) | |
|
Average orbital speed
|
4.64 km/s |
| 349.75° | |
| 0° 0m 14.405s / day | |
| Inclination | 1.9398° |
| 354.93° | |
| 79.441° | |
| Earth MOID | 25.7421 AU (3.85096 Tm) |
| Jupiter MOID | 21.655 AU (3.2395 Tm) |
| Jupiter Tisserand parameter | 5.337 |
| Physical characteristics | |
| Dimensions | 130? km |
| Mass | ~2×1018 kg |
|
Mean density
|
2.0? g/cm³ |
|
Equatorial surface gravity
|
~0.04 m/s² |
|
Equatorial escape velocity
|
~0.07 km/s |
|
Sidereal rotation period
|
? d |
| 0.09? | |
| Temperature | ~44 K |
| ? | |
| 7.9 | |
(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 (385185) 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 an assumed albedo of 0.09.
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