(308635) 2005 YU55
(308635) 2005 YU55, provisionally named 2005 YU55, is a potentially hazardous asteroid 360±40 meters in diameter, as measured after its Earth flyby. Previously it was estimated to be 310 meters or about 400 m (1,300 feet) in diameter. It was discovered on 28 December 2005 by Robert S. McMillan at Steward Observatory, Kitt Peak. On 8 November 2011 it passed 0.85 lunar distances (324,900 kilometers; 201,900 miles) from Earth.
| Discovery | |
|---|---|
| Discovered by | R. S. McMillan Steward Observatory Kitt Peak (691) |
| Discovery date | 28 December 2005 |
| Designations | |
MPC designation | (308635) 2005 YU55 |
Alternative designations | 2005 YU55 |
Minor planet category |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 2,183 days (5.98 yr) |
| Aphelion | 1.65562913 AU (247.678593 Gm) (Q) |
| Perihelion | 0.659003712 AU (98.5855521 Gm) (q) |
Semi-major axis | 1.15731642 AU (173.132072 Gm) (a) |
| Eccentricity | 0.430576028 (e) |
Orbital period (sidereal) | 1.25 Jyr (454.75 d) |
Mean anomaly | 175.227687° (M) |
Mean motion | 0° 47m 29.892s / day (n) |
| Inclination | 0.340553512° (i) |
Longitude of ascending node | 35.9073158° (Ω) |
| 273.628156° (ω) | |
| Known satellites | none |
| Earth MOID | 0.000433476 AU (64,847.1 km) (0.17 LD) |
| Venus MOID | 0.0017 AU (0.66 LD) |
| Mars MOID | 0.03884 AU (15.11 LD) |
| Jupiter MOID | 3.60813 AU (539.769 Gm) |
| TJupiter | 5.347 |
| Physical characteristics | |
| Dimensions | 360±40 m |
Mean radius | 0.2 km |
Synodic rotation period | 18 h (0.75 d) |
Sidereal rotation period | 19.31±0.02 h |
| 0.042±0.008 | |
| C-type | |
| 21.9 | |
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