| Discovered by | LINEAR |
|---|---|
| Discovery date | January 26, 2000 |
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Designations
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| Alternate name(s) | none |
| Minor planet category |
Aten asteroid, Mercury crosser, Venus crosser, Earth crosser, Mars grazer |
| Epoch August 27, 2011 (JD 2455800.5) | |
| Aphelion | 1.66090976 AU |
| Perihelion | 0.09204864 AU |
| Semi-major axis | 0.876479201 AU |
| Eccentricity | 0.8949791 |
| Orbital period | 0.82057943 a (299.716636 d) |
| Mean anomaly | 207.10800° |
| Inclination | 25.68871° |
| Longitude of ascending node | 333.78470° |
| Argument of perihelion | 324.26746° |
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Physical characteristics
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| Dimensions | 0.91 km[2] |
| Albedo | 0.11[2] |
| Absolute magnitude (H) | 17.1[1] |
(137924) 2000 BD19 (also written 2000 BD19) is an asteroid 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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