* Astronomy

Blobrana · L

Asteroid 2009 BD81

Blobrana · L

The 220 - 500 metre wide asteroid 2009 BD81 will make a close pass (17.9 Lunar Distances, 0.0459 AU) to the Earth-Moon system on the 27th February 2009.

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).

On January 31, 2009 a Potentially Hazardous Asteroid (PHA) 2009 BD81 was discovered at ARO by Observer R. Holmes, measurers S. Kirby, K. Dankov, H. Devore and was published in MPEC 2009-C09 on February 2nd 2009. At the time of discovery the ARO 0.61-m telescope was performing routine follow-up astrometric observations on NEO 2008 EV5. Immediately I knew any unknown object at a declination of 72 degrees north had to be an interesting object with an unusual orbit. 2009 BD81 was discovered at 0225 UT on 31 January by the Astronomical Research Observatory which observed it at January 31.10 and February 2.30.

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Blobrana · L

A Ranger High School science teacher has discovered an asteroid that will pass within 7 million kilometers of Earth -- and could potentially strike the planet.
Steven Kirby spotted the asteroid in an online photo during an astronomy workshop for teachers Saturday in Abilene.

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Asteroid 2009 BD₈₁ = SLK0001 (NEOCPO)

Orbital elements:
2009 BD81                                           PHA, Earth MOID = 0.0469 AU
Epoch 2008 Nov. 30.0 TT = JDT 2454800.5                 MPC
M 337.21310              (2000.0)            P               Q
n   0.22474298     Peri.  190.56222     -0.99492922     -0.08161838
a   2.6792421      Node   344.38894     +0.10057757     -0.80754849
e   0.6513944      Incl.   12.61518     -0.00002867     -0.58412660
P   4.39           H   20.2           G   0.15           U   8

MPEC 2009 -C09

2009BD81 - impactor table

Object: 2009BD81  

     date         MJD       sigma sigimp   dist ±   width    stretch    p_RE    exp. en.    PS  
   YYYY/MM                                 (RE)       (RE)      RE/sig               MT           
--------------------------------------------------------------------------------------------------
2042/03/05.354  66948.354   2.628 0.000    1.37 ±    2.172  1.16E+05  9.72E-08  1.27E-04  -4.52
2046/03/02.562  68406.562   2.109 1.628   24.93 ±   14.444  3.98E+05  3.93E-09  5.96E-06  -5.91
2048/03/02.457  69137.457  -2.387 3.070   57.20 ±   18.165  2.57E+05  1.11E-10  1.29E-07  -7.57
2062/03/04.856  74252.856  -1.073 1.528    4.12 ±    1.766  1.55E+05  2.47E-08  3.10E-05  -5.33
2065/02/24.750  75340.750   2.153 0.613   13.03 ±   18.933  4.50E+06  8.21E-10  1.25E-06  -6.77

Based on   21 optical observations (of which   0 are rejected as outliers)
from 2009/01/31.102 to 2009/02/03.018.

Source