![]() Orbital diagram of 2010 TD54 during its near-Earth encounter on 12 Oct 2010 | |
Discovery [1] | |
---|---|
Discovered by | Mount Lemmon Srvy. |
Discovery site | Mount Lemmon Obs. |
Discovery date | 9 October 2010 |
Designations | |
2010 TD54 | |
NEO · Apollo [1] [2] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 6 | |
Observation arc | 3 days |
Aphelion | 3.2396 AU |
Perihelion | 0.7020 AU |
1.9708 AU | |
Eccentricity | 0.6438 |
2.77 yr (1,011 days) | |
159.97° | |
0° 21m 22.32s / day | |
Inclination | 4.3045° |
18.607° | |
76.068° | |
Earth MOID | 0.000178 AU 0.0693 LD |
Physical characteristics | |
Dimensions | 5 m [3] 5–10 m [4] |
0.01167 h (dated) [5] 0.0229317 h [3] [a] | |
0.20 (assumed) [3] | |
Srv [6] | |
28.9 [1] | |
2010 TD54 is a tiny asteroid and fast rotator, classified as a near-Earth object of the Apollo group, approximately 5 meters in diameter. It was first observed by the Mount Lemmon Survey in October 2010, when the asteroid crossed through the Earth-moon system and had a close encounter with Earth. [4]
2010 TD54 orbits the Sun at a distance of 0.7–3.2 AU once every 2 years and 9 months (1,011 days). Its orbit has an eccentricity of 0.64 and an inclination of 4° with respect to the ecliptic. [1]
The body's observation arc begins with its first observations by the Mount Lemmon Survey and only spans over a period of 3 days until 12 October 2010. It has been observed since then. [2]
2010 TD54 made its closest approach at 10:51, 12 October 2010 UTC (6:51 EDT a.m.) at 0.000346 AU (51,800 km ; 32,200 mi ). It is one of the closest known approaches of an asteroid to Earth, at which time the object appeared at a magnitude of 14. It was first observed by of the Catalina Sky Survey 's telescopes north of Tucson, Arizona on 9 October 2010. [4]
It has an Earth minimum orbit intersection distance of 0.000178086 AU (26,600 km; 16,600 mi), which corresponds to 0.0693 lunar distance. [1] It was removed from the Sentry Risk Table on 11 October 2010. [7] The asteroid may have passed 0.0009 AU (135,000 km; 83,700 mi) from Earth in October 1979, but the nominal orbit suggests it passed millions of kilometres from Earth in 1979. [1]
2010 TD54 is a stony asteroid, characterized as a Srv subtype. [6]
In November 2010, a rotational light curve of 2010 TD54 was obtained from photometric observations, which showed that the asteroid is a fast rotator. Light curve analysis gave a well-defined rotation period of 0.0229317 hours (1 minute and 23 seconds) with a brightness amplitude of 0.92 magnitude ( U=3 ). A high amplitude typically indicates that the body has an irregular, elongated rather than spherical shape. [a] This result supersedes a previously obtained lightcurve with a shorter period of 0.01167 hours ( U=1 ). [5]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5 metres (16 feet) based on an absolute magnitude of 28.9. [3] NASA's press release gave an estimated diameter of 5 to 10 meters (16 to 33 feet). [4]