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Blobrana · L

RE: Asteroid 2009 BD

Blobrana · L

2009 BD
Earth Impact Risk Summary

Torino Scale (maximum)	0
Palermo Scale (maximum)	-7.54
Palermo Scale (cumulative)	-7.14
Impact Probability (cumulative)	8.0e-06
Number of Potential Impacts	7

V_impact	11.20 km/s
V_infinity	1.09 km/s
H	28.4
Diameter	0.007 km
Mass	5.2e+05 kg
Energy	7.8e-03 MT
all above are mean values weighted by impact probability

Analysis based on
121 observations spanning 289.19 days
(2009-Jan-16.27641 to 2009-Nov-01.468038)

Blobrana · L

Blobrana · L

Ephemeris

 Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC  APmag           
 2009-Oct-18 00:00     01 37 54.49 +04 47 11.0  22.08 
 2009-Oct-19 00:00     01 34 23.05 +04 33 48.7  22.09 
 2009-Oct-20 00:00     01 30 51.22 +04 20 37.8  22.13 
 2009-Oct-21 00:00     01 27 19.81 +04 07 41.9  22.18
 2009-Oct-22 00:00     01 23 49.59 +03 55 04.7  22.25 
 2009-Oct-23 00:00     01 20 21.32 +03 42 49.3  22.31 
 2009-Oct-24 00:00     01 16 55.70 +03 30 58.6  22.38

Closest approach to the Earth at 18:06 UT, 20th October, 2009

Blobrana · L

2009 BD
Earth Impact Risk Summary

Torino Scale (maximum)	0
Palermo Scale (maximum)	-5.29
Palermo Scale (cumulative)	-5.11
Impact Probability (cumulative)	6.5e-04
Number of Potential Impacts	9

V_impact	11.20 km/s
V_infinity	1.08 km/s
H	28.3
Diameter	0.007 km
Mass	5.3e+05 kg
Energy	7.8e-03 MT
all above are mean values weighted by impact probability

Analysis based on
118 observations spanning 9.7514 days
(2009-Jan-16.27641 to 2009-Jan-26.027773)

Blobrana · L

The 5.7 - 13 metre wide asteroid 2009 BD will make a close pass (17.3 Lunar Distances, 0.0444 AU), travelling at 1.21 km/s, to the Earth-Moon system on the 20th October, 2009.

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

Blobrana · L

Asteroid 2009BD, discovered in early January, has been following us in an orbit almost identical to Earths.
Just 30-feet across, 2009BD is no threat to Earth. It does orbit, however, close enough to qualify as a Near-Earth Object (NEO). It made its closest approach to Earth Jan. 25, when it was just 400,000 miles away, or about 1.8 times the distance to the Moon (about 250,000). You can do the math.
For the next several months, perhaps even years, this space rock will stay close to Earth, an average of 0.1 astronomical units away.

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Blobrana · L

The Earth had company this week when an asteroid practically grazed the planet - passing by just 400,000 miles away. That's less than twice the distance of the Earth to the Moon.
The 8-metre-wide rock, known as 2009 BD, is a co-orbital asteroid, which means it orbits the Sun on almost the same plane as Earth does. The coupling offers rare opportunities to discover more about asteroids.
Rather than speeding past fleetingly like most asteroids, co-orbital ones synch up with Earth and perform a spiralling dance around it, sometimes lasting for many months or even years. They are sometimes referred to as second moons, despite their diminutive size.

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Blobrana · L

2009BD - impactor table

Object: 2009BD    

     date         MJD       sigma sigimp   dist ±   width    stretch    p_RE    exp. en.    PS  
   YYYY/MM                                 (RE)       (RE)      RE/sig               MT           
--------------------------------------------------------------------------------------------------
2060/05/21.793  73600.793  -0.943 0.000    4.94 ±    0.003  1.23E+04  3.79E-04  2.99E-06  -5.29
2072/05/04.707  77966.707  -2.647 0.000    8.40 ±    0.007  6.38E+05  2.06E-07  1.63E-09  -8.65
2073/05/22.614  78349.614  -0.174 0.000    8.97 ±    0.005  5.17E+04  8.13E-05  6.41E-07  -6.06
2078/04/29.405  80152.405  -1.916 0.000    6.58 ±    0.027  6.73E+05  1.52E-06  1.20E-08  -7.82
2082/05/13.286  81627.286  -1.652 0.000    1.91 ±    0.008  1.74E+06  1.16E-06  9.18E-09  -7.96
2085/05/05.065  82715.065   0.033 0.000    9.11 ±    0.000  4.04E+06  9.45E-07  7.47E-09  -8.07
2085/05/22.107  82732.107   0.400 0.000    6.91 ±    0.005  1.34E+05  5.07E-05  4.01E-07  -6.34
2085/05/22.069  82732.069   0.606 0.000    8.96 ±    0.004  6.28E+04  1.10E-04  8.71E-07  -6.00
2086/05/16.949  83091.949  -1.125 0.000    0.97 ±    0.000  2.77E+06  1.58E-06  1.25E-08  -7.85
2087/05/07.902  83447.902  -2.330 0.000   10.05 ±    0.009  8.71E+05  1.39E-07  1.10E-09  -8.91
2087/05/18.316  83458.316  -1.313 0.000    0.57 ±    0.001  4.28E+05  8.01E-06  6.32E-08  -7.15
2087/05/18.832  83458.832  -1.130 0.000    3.94 ±    0.006  1.41E+06  2.83E-06  2.23E-08  -7.60
2088/05/09.571  83815.571  -2.341 0.000    5.47 ±    0.009  8.02E+05  5.58E-07  4.40E-09  -8.31
2088/05/10.418  83816.418  -2.111 0.000   10.14 ±    0.009  3.56E+05  6.89E-07  5.43E-09  -8.22
2088/05/19.341  83825.341  -1.276 0.000    8.40 ±    0.002  1.58E+05  1.49E-05  1.17E-07  -6.89
2088/05/19.485  83825.485  -1.142 0.000   10.49 ±    0.006  4.17E+05  1.54E-06  1.21E-08  -7.87
2088/05/02.853  83808.853   0.055 0.000    7.56 ±    0.000  2.14E+07  2.90E-07  2.29E-09  -8.60

Based on  119 optical observations (of which   1 are rejected as outliers)
from 2009/01/16.277 to 2009/01/26.029.

Source

Blobrana · L

A curious asteroid flew past Earth on Sunday, January 25, 2009. What is strange and curious about this asteroid called 2009 BD is that its orbit is almost identical with the orbit of Earth.
The asteroid 2009 BD, which was discovered by the Mt. Lemmon Survey, is about ten meters across. It is passing by Earth from a (closest) distance of about 644,000 kilometres.

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