2011 BT15
| Discovery | |
|---|---|
| Discovered by | Pan-STARRS |
| Discovery site | Haleakala Obs. |
| Discovery date | 24 January 2011 |
| Designations | |
| MPC designation | (471240) 2011 BT15 |
| 2011 BT15 | |
| NEO · PHA · Apollo | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 9.63 yr (3,519 days) |
| Aphelion | 1.6842 AU |
| Perihelion | 0.9018 AU |
| 1.2930 AU | |
| Eccentricity | 0.3025 |
| 1.47 yr (537 days) | |
| 204.24° | |
| 0° 40m 13.08s / day | |
| Inclination | 1.6613° |
| 105.37° | |
| 308.78° | |
| Earth MOID | 0.0008 AU · 0.3 LD |
| Physical characteristics | |
| Dimensions | 0.136 km (calculated) 0.150 km |
| Mass | 4.9×109 kg (assumed) |
| 0.109138±0.000002 h | |
| 0.20 (assumed) | |
| S | |
| 21.7 | |
(471240) 2011 BT15, provisional designation 2011 BT15, is a stony, sub-kilometer sized asteroid and fast rotator, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. It had been one of the objects with the highest impact threat on the Palermo Technical Impact Hazard Scale.
It was discovered on 24 January 2011, by a team of astronomers at Pan-STARRS, the Panoramic Survey Telescope and Rapid Response System at Haleakala Observatory on Hawaii, United States. The discovery was made using a 1.8-meter Ritchey–Chrétien telescope. At the time of discovery, the object had an apparent magnitude of 22.
Before the 2013 recovery it had an observation arc of 41 days with an uncertainty parameter of 7. Due to precovery images from 2007 it now has an observation arc of more than 5 years. It makes close approaches to Earth and Mars.
On 28 December 2013, it passed 0.03222 AU (4,820,000 km) from Earth. The December 2013 passage was studied by the Goldstone Deep Space Network and further refined the orbit.
While listed on the Sentry Risk Table, virtual clones of the asteroid that fit the uncertainty region in the known trajectory showed a 1 in 71,000 chance that the asteroid could impact Earth on 5 January 2080.
In 2013 it had the 5th highest impact threat on the Palermo Technical Impact Hazard Scale. It was removed from the Sentry Risk Table on 17 June 2013.
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