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TOPIC: Asteroid 2009 BD
Blobrana


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RE: Asteroid 2009 BD
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Newly-discovered asteroid 2009 BD is slowly passing by Earth today only 400,000 miles away. The small 10m-wide space rock poses no threat, but it merits attention anyway. The orbit of 2009 BD appears to be almost identical to the orbit of Earth. 2009 BD may be a rare co-orbital asteroid, circling the sun in near-tandem with our planet.

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2009 BD's orbit is just a tiny shade larger than Earth's, with a semi-major axis of 1.007 AU, compared with 1.000 AU for Earth (be definition, an Astronomical Unit, or AU, is the semi-major axis of Earth's orbit).  That means that 2009 BD takes just a shade longer to orbit the Sun than Earth.  2009 BD's orbit is also just a shade more elliptical than Earth's orbit.  It has an orbital eccentricity of 0.0278, versus Earth's eccentricity of 0.0167.  This means that 2009 BD's orbit sometimes carries it a little closer to the Sun than Earth, and sometimes a little farther away from the Sun.  It is currently passing us from being a little farther from the Sun to a little closer.  However, as 2009 BD gets closer to the Sun, it speeds up.  It is going to pull away from Earth, leading us around the Sun.  However, its elliptical orbit will again carry it farther from the Sun than Earth.  When that happens it will slow down.  Remember that its orbit on the whole takes a little longer to go around the Sun than Earth.  So, eventually it will be moving slow enough that Earth will pass it up.  That will happen in October of this year.

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Blobrana


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Ephemeris:
2009 BD                  a,e,i = 1.01, 0.03, 1                   q = 0.9794
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2009 01 09    07 55.27   +05 36.9    0.0129   0.996   161.5    18.2    20.3
2009 01 10    07 55.14   +07 02.3    0.0122   0.995   163.4    16.4    20.1
2009 01 11    07 54.97   +08 38.5    0.0116   0.995   165.5    14.3    19.9
2009 01 12    07 54.77   +10 27.3    0.0109   0.994   167.7    12.1    19.7
2009 01 13    07 54.52   +12 30.9    0.0102   0.994   170.2     9.7    19.5
2009 01 14    07 54.19   +14 52.1    0.00956  0.993   173.0     6.9    19.2
2009 01 15    07 53.78   +17 34.4    0.00891  0.992   176.1     3.9    18.9
2009 01 16    07 53.23   +20 41.9    0.00829  0.992   179.5     0.5    18.5
2009 01 17    07 52.52   +24 19.8    0.00768  0.991   176.4     3.6    18.5
2009 01 18    07 51.59   +28 34.3    0.00710  0.991   171.8     8.2    18.6
2009 01 19    07 50.35   +33 32.6    0.00654  0.990   166.5    13.4    18.6
2009 01 20    07 48.63   +39 22.8    0.00604  0.990   160.3    19.6    18.7
2009 01 21    07 46.16   +46 12.6    0.00558  0.989   153.2    26.7    18.7
2009 01 22    07 42.32   +54 07.6    0.00519  0.988   145.0    34.9    18.8
2009 01 23    07 35.58   +63 07.7    0.00489  0.988   135.7    44.1    18.9
2009 01 24    07 20.57   +73 02.0    0.00468  0.987   125.4    54.3    19.1
2009 01 25    06 18.62   +83 15.0    0.00459  0.986   114.6    65.1    19.4
2009 01 26    22 04.98   +84 35.4    0.00462  0.986   103.8    76.0    19.7
2009 01 27    20 40.39   +74 49.7    0.00476  0.985    93.3    86.4    20.2
2009 01 28    20 23.04   +65 26.9    0.00501  0.984    83.8    95.9    20.7
2009 01 29    20 15.56   +57 02.5    0.00534  0.984    75.3   104.4    21.3
2009 01 30    20 11.33   +49 41.5    0.00573  0.983    68.0   111.7    21.8
2009 01 31    20 08.56   +43 20.4    0.00619  0.982    61.7   118.0    22.4
2009 02 01    20 06.59   +37 52.1    0.00668  0.982    56.4   123.3    23.0
2009 02 02    20 05.08   +33 08.8    0.00720  0.981    51.9   127.8    23.5
2009 02 03    20 03.90   +29 03.3    0.00775  0.980    48.1   131.6    24.1


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Blobrana


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There's a newly-discovered weird asteroid kid on Earth's block, and it's moved in close. Really, really close, in space terms.
Asteroid 2009 BD is cruising by us today at a distance of only about 400,000 miles, according to NASA's Near Earth Object Program. This strange asteroid is  estimated to be  5. 7 meters to 13 meters in diameter.

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Blobrana


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2009BD - impactor table 
Object: 2009BD    

     date         MJD       sigma sigimp   dist ±   width    stretch    p_RE    exp. en.    PS  
   YYYY/MM                                 (RE)       (RE)      RE/sig               MT           
--------------------------------------------------------------------------------------------------
2053/05/07.892  71029.892   1.988 0.000    9.83 ±    0.015  1.74E+05  2.01E-06  1.55E-08  -7.51
2054/05/07.694  71394.694   2.025 0.000    5.86 ±    0.016  2.31E+05  3.79E-06  2.92E-08  -7.25
2055/05/07.570  71759.570   2.053 0.000    0.55 ±    0.016  2.77E+05  3.54E-06  2.73E-08  -7.28
2055/05/07.560  71759.560   2.053 0.000    0.49 ±    0.016  2.77E+05  3.54E-06  2.73E-08  -7.28
2056/05/06.609  72124.609   2.075 0.000    1.38 ±    0.017  3.32E+05  2.85E-06  2.20E-08  -7.39
2060/05/05.766  73584.766   2.133 0.000    4.87 ±    0.019  5.02E+05  1.46E-06  1.13E-08  -7.71
2060/05/21.712  73600.712  -1.313 0.000    5.20 ±    0.004  3.13E+04  9.83E-05  7.57E-07  -5.89
2060/05/19.095  73598.095   1.090 0.000    4.89 ±    0.000  7.70E+05  5.12E-06  3.95E-08  -7.17
2060/05/05.944  73584.944   2.133 0.000    7.87 ±    0.021  5.02E+05  1.46E-06  1.12E-08  -7.71
2061/05/05.858  73949.858   2.143 0.000    7.09 ±    0.021  5.31E+05  1.11E-06  8.53E-09  -7.84
2061/05/22.676  73966.676   0.778 0.000    2.25 ±    0.007  1.09E+05  5.49E-05  4.23E-07  -6.15
2061/05/21.809  73965.809   0.962 0.000    5.07 ±    0.004  2.66E+04  1.69E-04  1.30E-06  -5.66
2061/05/20.794  73964.794   1.058 0.000    2.57 ±    0.003  8.93E+04  5.30E-05  4.08E-07  -6.16
2063/05/05.962  74679.962   2.161 0.000    5.95 ±    0.022  5.84E+05  1.09E-06  8.41E-09  -7.86
2064/05/03.568  75043.568   0.672 0.000    0.66 ±    0.716  4.11E+07  1.62E-07  1.25E-09  -8.70
2064/05/05.071  75045.071   2.169 0.000    6.77 ±    0.024  6.01E+05  9.69E-07  7.47E-09  -7.92

Based on  116 optical observations (of which   1 are rejected as outliers)
from 2009/01/16.277 to 2009/01/23.801
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Blobrana


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The 5 - 11 metre wide asteroid 2009 BD will make a close pass (1.8 Lunar Distances) to the Earth-Moon system on 25th January 2009.

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Orbital elements:
2009 BD                                                  Earth MOID = 0.0021 AU
Epoch 2008 Nov. 30.0 TT = JDT 2454800.5                 MPC
M 255.72588              (2000.0)            P               Q
n   0.97480152     Peri.   60.01785     -0.99845300     -0.05067737
a   1.0073767      Node   117.06888     +0.03789743     -0.92133465
e   0.0277868      Incl.    1.47224     +0.04068653     -0.38545333
P   1.01           H   28.8           G   0.15           U   3
MPEC 2009 -B14

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Blobrana


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Orbital elements:
2009 BD                                                  Earth MOID = 0.0021 AU
Epoch 2008 Nov. 30.0 TT = JDT 2454800.5                 MPC
M 255.72588              (2000.0)            P               Q
n   0.97480152     Peri.   60.01785     -0.99845300     -0.05067737
a   1.0073767      Node   117.06888     +0.03789743     -0.92133465
e   0.0277868      Incl.    1.47224     +0.04068653     -0.38545333
P   1.01           H   28.8           G   0.15           U   3
MPEC 2009 -B14

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Blobrana


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Posts: 131433
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9B82224
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Orbital elements:

9B82224
   Perihelion 2009 Mar 23.935140 TT = 22:26:36 (JD 2454914.435140)
Epoch 2009 Jan 16.0 TT = JDT 2454847.5   Earth MOID: 0.0001
M 294.51296              (2000.0)            P               Q
n   0.97836561     Peri.   68.98890     -0.99598451      0.08618808     
a   1.00492873     Node   115.94871     -0.08883340     -0.91786616     
e   0.0338343      Incl.    1.54327     -0.01111153     -0.38741877     
P   1.01/367.95d   H   28.9     G   0.15   q 0.97092758  Q 1.03892987
From 11 observations 2009 Jan. 16
Ephemeris
Date       UT   *  R.A. (J2000) Decl.  Elong.  V        Motion     
            h                                        "/min   P.A.
2009 01 16 15     07 53 14.7 +22 57 45 177.9  18.4   10.02  002.4  
2009 01 16 16     07 53 16.6 +23 07 50 177.7  18.4   10.19  002.4  
2009 01 16 17     07 53 18.4 +23 18 07 177.5  18.4   10.37  002.4  
2009 01 16 18     07 53 20.4 +23 28 34 177.3  18.4   10.56  002.4  
2009 01 16 19     07 53 22.3 +23 39 13 177.1  18.4   10.75  002.4  
2009 01 16 20     07 53 24.3 +23 50 03 177.0  18.4   10.94  002.4   
2009 01 16 21     07 53 26.3 +24 01 05 176.8  18.4   11.14  002.4   
2009 01 16 22     07 53 28.4 +24 12 19 176.6  18.4   11.35  002.4  
2009 01 16 23     07 53 30.5 +24 23 45 176.4  18.4   11.56  002.4   
2009 01 17 00     07 53 32.6 +24 35 24 176.2  18.4   11.77  002.4  
2009 01 17 01     07 53 34.8 +24 47 17 176.0  18.4   11.99  002.4   
2009 01 17 02     07 53 37.0 +24 59 22 175.7  18.4   12.22  002.4   
2009 01 17 03     07 53 39.3 +25 11 42 175.5  18.4   12.45  002.4  
2009 01 17 04     07 53 41.6 +25 24 16 175.3  18.3   12.69  002.4   
2009 01 17 05     07 53 44.0 +25 37 04 175.1  18.3   12.94  002.4  
2009 01 17 06     07 53 46.4 +25 50 08 174.9  18.3   13.20  002.4   
2009 01 17 07     07 53 48.8 +26 03 26 174.6  18.3   13.46  002.4   
2009 01 17 08     07 53 51.3 +26 17 01 174.4  18.3   13.72  002.4   
2009 01 17 09     07 53 53.9 +26 30 52 174.1  18.3   14.00  002.4   
2009 01 17 10     07 53 56.5 +26 45 00 173.9  18.3   14.28  002.4  
2009 01 17 11     07 53 59.1 +26 59 25 173.6  18.3   14.57  002.4   
2009 01 17 12     07 54 01.9 +27 14 07 173.4  18.3   14.87  002.4   
2009 01 17 13     07 54 04.6 +27 29 08 173.1  18.3   15.18  002.4   
2009 01 17 14     07 54 07.5 +27 44 28 172.9  18.3   15.50  002.4  
2009 01 17 15     07 54 10.4 +28 00 07 172.6  18.2   15.83  002.4


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