(308635) 2005 YU55
|
|
| Discovery | |
|---|---|
| Discovered by |
R. S. McMillan Steward Observatory, Kitt Peak (691) |
| Discovery date | 28 December 2005 |
| Designations | |
| MPC designation | 2005 YU55 |
Apollo  NEO, PHA |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 2183 days (5.98 yr) |
| Aphelion | 1.65562913 AU (247.678593 Gm) (Q) |
| Perihelion | 0.659003712 AU (98.5855521 Gm) (q) |
| 1.15731642 AU (173.132072 Gm) (a) | |
| Eccentricity | 0.430576028 (e) |
| 1.25 yr (454.75 d) | |
| 175.227687° (M) | |
| 0° 47m 29.892s / day (n) | |
| Inclination | 0.340553512° (i) |
| 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) |
| Jupiter Tisserand parameter | 5.347 |
| Physical characteristics | |
| Dimensions | 360±40 meters |
|
Mean radius
|
0.2 km |
| 18 h (0.75 d) | |
|
Sidereal rotation period
|
19.31 ± 0.02 h |
| 0.042±0.008 | |
| C-type | |
| 21.9 | |
(308635) 2005 YU55, provisionally known as 2005 YU55, is a potentially hazardous asteroid 360±40 meters in diameter, as measured after its Earth flyby. Previously it was estimated at 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.
In February 2010, (308635) 2005 YU55 was rated 1 on the Torino Scale for a potential pass near Earth on November 10, 2103, that posed no unusual level of danger. On 19 April 2010, radar ranging by the Arecibo radio telescope reduced uncertainties about the orbit by 50%. This improvement eliminated any possibility of an impact with Earth within the next 100 years. It was removed from the Sentry Risk Table on 22 April 2010 and as such it now has a rating of 0 on the Torino Scale. It is now known that on 10 November 2103 (308635) 2005 YU55 will be roughly 2 AU from Earth.
On 8 November 2011 at 23:28 UT the asteroid passed 0.85 LD (330,000 km; 200,000 mi) from Earth. On 9 November 2011 at 07:13 UT the asteroid passed 0.6231 LD (239,500 km; 148,800 mi) from the Moon. During the close approach the asteroid reached about apparent magnitude 11, and would have been visible to experienced observers using high-end binoculars with an objective lens of 80+ mm if it were not for bright moonlight preventing a true dark sky. Since the gibbous moon did interfere with the viewing, observers trying to visually locate the asteroid required a telescope with an aperture of 6 inches (15 centimeters) or larger.
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