- (137924) 2000 BD19
Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=(137924) 2000 BD19
discoverer=LINEAR
discovered=January 26 ,2000
alt_names="none"
mp_category=Aten asteroid ,Mercury-crosser asteroid ,Venus-crosser asteroid ,Earth-crosser asteroid ,Mars-crosser asteroid
epoch=February 26 ,2000 (JD 2451600.5)
semimajor=131.109 Gm (0.876 AU)
perihelion=13.749 Gm (0.092 AU)
aphelion=248.470 Gm (1.661 AU)
eccentricity=0.895
period=299.681 d (0.82 a)
inclination=25.639°
asc_node=333.878°
arg_peri=324.184°
mean_anomaly=202.259°
avg_speed=23.85 km/s
dimensions=~1.6 km
mass=?×10? kg
density=2 ? g/cm³
surface_grav=? m/s²
escape_velocity=? km/s
rotation=? d
spectral_type=?
abs_magnitude=16.74
albedo=0.1 ?
single_temperature=~297 KAn asteroid discovered byLINEAR in January of2000 , (137924) 2000 BD19 (2000 BD₁₉, also written 2000 BD19) was soon after located byDANEOPS on Palomar plates fromFebruary 10 ,1997 . This allowed a reasonably precise orbit determination, and as a result it was spotted again onFebruary 27 ,2001 andJanuary 21 ,2002 . 2000 BD19 has the closest perihelion of any known asteroid (as of July2004 ), at 0.092 AU —38% of Mercury's orbital radius. That and its high eccentricity (0.895) and inclination (25.7°), seem to indicate an inactive or extinctcomet . It hasn't been caught displaying cometary activity so far.One can estimate that 2000 BD19's surface temperature reaches ~920 K at perihelion, enough to melt
lead andzinc , and nearly enough to meltaluminium . 2000 BD19 is considered a good candidate for measuring the effects ofAlbert Einstein 'sGeneral theory of relativity because of how close it comes to the Sun. [Margot, Jean-Luc [http://www.astro.cornell.edu/~jlm/NEAs/2000BD19/ Measuring asteroidal perihelion advance to measure solar oblateness and test general relativity] , retrievedDec 22 2007 ]When it was discovered, it beat
1995 CR 's record for both asteroid with the smallest perihelion and forAten asteroid with the highest eccentricity. With a high eccentricity, not only does 2000 BD19 get close to the Sun, but it also travels relatively far away from it. It has the third largest aphelion of anyAten asteroid and is one of the fewAten asteroid s that is also a Mars crosser.References
* [http://cfa-www.harvard.edu/mpec/K00/K00C49.html MPEC 2000-C49]
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