(137924) 2000 BD19

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(137924) 2000 BD19
Discovered by LINEAR
Discovery date 26 January 2000
NEO · Aten,
Mercury crosser,
Venus crosser,
Earth crosser,
Mars grazer
Orbital characteristics[1][3]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 6960 days (19.06 yr)
Aphelion 1.66093678 AU (248.472606 Gm)
Perihelion 0.092057468 AU (13.7716012 Gm)
0.876497123 AU (131.1221033 Gm)
Eccentricity 0.8949712
0.82 yr (299.7 d)
Inclination 25.716450°
Earth MOID 0.0904402 AU (13.52966 Gm)
Physical characteristics
Dimensions 0.97 km[2]
10.570 h (0.4404 d)[1]

(137924) 2000 BD19, provisional designation 2000 BD19 is a sub-kilometer asteroid and near-Earth object with the smallest perihelion of any numbered asteroid (0.092 AU—38% of Mercury's orbital radius). With its high eccentricity, not only does 2000 BD19 get very close to the Sun, but it also travels relatively far away from it. It has the third largest aphelion of any numbered Aten asteroid[4] and is one of a small group of Aten asteroids that is also a Mars grazer,[5] its orbital elements indicate that may be an extinct comet. It hasn't been seen displaying cometary activity so far.

2000 BD19 was discovered by LINEAR in January 2000 and was soon after located by DANEOPS on Palomar plates from February 10, 1997. This allowed a reasonably precise orbit determination, and as a result it was spotted again on February 27, 2001 and January 21, 2002. When it was discovered, it beat 1995 CR's record for both asteroid with the smallest perihelion and for Aten asteroid with the highest eccentricity.

It is estimated that 2000 BD19's surface temperature reaches ~920 K at perihelion, enough to melt lead and zinc, and nearly enough to melt aluminium. 2000 BD19 is considered a good candidate for measuring the effects of Albert Einstein's general theory of relativity because of how close it comes to the Sun.[6]


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