66391 Moshup
66391 Moshup /ˈmɒʃʌp/, provisional designation 1999 KW4, is a binary asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Aten group, approximately 1.3 kilometers in diameter. It was discovered on 20 May 1999, by Lincoln Near-Earth Asteroid Research (LINEAR) at the Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States. It is a Mercury-crosser that comes extremely close to the Sun at a perihelion of 0.2 AU.
Moshup and its satellite Squannit imaged by the Very Large Telescope's SPHERE instrument | |
| Discovery | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 20 May 1999 |
| Designations | |
| Pronunciation | /ˈmɒʃʌp/ |
Named after | Maushop (native American legend) |
Alternative designations | 1999 KW4 |
Minor planet category | Aten · NEO · PHA Mercury-crosser Venus-crosser |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 19.01 yr (6,942 days) |
| Aphelion | 1.0845 AU |
| Perihelion | 0.2000 AU |
Semi-major axis | 0.6422 AU |
| Eccentricity | 0.6886 |
Orbital period (sidereal) | 0.51 yr (188 days) |
Mean anomaly | 359.03° |
Mean motion | 1° 54m 54s / day |
| Inclination | 38.884° |
Longitude of ascending node | 244.91° |
| 192.62° | |
| Known satellites | 1 (Squannit /ˈskwɒnɪt/) |
| Earth MOID | 0.0138 AU · 5.4 LD |
| Physical characteristics | |
| Dimensions | 1.532 × 1.495 × 1.347 km |
Mean diameter | 1.317±0.040 km |
| Mass | (2.49±0.054)×1012 kg |
Mean density | 1.97±0.24 g/cm3 |
Synodic rotation period | 2.7650 h |
| 0.26 (derived) | |
| SMASS = S V–I=0.85±0.01 V–R=0.44±0.02 V–I=0.65±0.03 | |
| 16.5 | |
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