9969 Braille
9969 Braille, provisional designation 1992 KD, is an eccentric, rare-type and elongated asteroid from the innermost regions of the asteroid belt, classified as Mars-crosser and slow rotator, approximately 1–2 kilometers in diameter. It was discovered in 1992, by astronomers at Palomar Observatory and later named after Louis Braille, the inventor of the writing system for the blind. It was photographed in closeup by the spacecraft Deep Space 1 in 1999, but a malfunction resulted in indistinct images.
Braille imaged by Deep Space 1 in 1999 | |
| Discovery | |
|---|---|
| Discovered by | E. F. Helin K. J. Lawrence |
| Discovery site | Palomar Obs. |
| Discovery date | 27 May 1992 |
| Designations | |
MPC designation | (9969) Braille |
| Pronunciation | /ˈbreɪl/ |
Named after | Louis Braille (inventor of braille) |
Alternative designations | 1992 KD |
Minor planet category | Mars-crosser |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 24.93 yr (9,107 days) |
| Aphelion | 3.3557 AU |
| Perihelion | 1.3263 AU |
Semi-major axis | 2.3410 AU |
| Eccentricity | 0.4334 |
Orbital period (sidereal) | 3.58 yr (1,308 days) |
Mean anomaly | 16.880° |
| Inclination | 28.999° |
Longitude of ascending node | 241.95° |
| 356.11° | |
| Earth MOID | 0.3154 AU · 122.9 LD |
| Physical characteristics | |
| Dimensions | 1.600±0.511 km 1.64 km (derived) 2.1 km × 1 km × 1 km |
| Mass | 7.8×1012kg |
Mean density | 3.9 g cm−3 |
Synodic rotation period | 226 h 226.4 h |
| 0.1289±0.2441 0.18 (assumed) | |
| SMASS = Q | |
| 15.8 | |
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