List of asteroid close approaches to Earth in 2009

Last updated

Time of discovery of asteroids which came closer to Earth than the moon in 2008

Contents

  After closest approach: 7 (36.8%)
  <24 hours before: 1 (5.3%)
  Up to 7 days before: 11 (57.9%)
  > one week before: 0 (0%)
  > 7 weeks before: 0 (0%)
  > one year before: 0 (0%)
Other Years
2000-2007, 2008, 2009, 2010, 2011
Asteroid Close Approaches to Earth
2009
  After closest approach: 7 (36.8%)
  <24 hours before: 1 (5.3%)
  Up to 7 days before: 11 (57.9%)
  > one week before: 0 (0%)
  > 7 weeks before: 0 (0%)
  > one year before: 0 (0%)
Time of discovery of asteroids which came closer to Earth than the moon in 2008
Other Years
2000-2007, 2008, 2009, 2010, 2011

Below is the list of asteroid close approaches to Earth in 2009.

Timeline of close approaches less than one lunar distance from Earth in 2009

A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2009. [note 1]

  Rows highlighted red indicate objects which were not discovered until after closest approach

  Rows highlighted yellow indicate objects discovered less than 24 hours before closest approach

  Rows highlighted green indicate objects discovered more than one week before closest approach

  Rows highlighted turquoise indicate objects discovered more than 7 weeks before closest approach

  Rows highlighted blue indicate objects discovered more than one year before closest approach (i.e.
objects successfully cataloged on a previous orbit, rather than being detected during final approach)

This list does not include any of the objects that collided with earth in 2009, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices.

Date of
closest
approach		Date
discovered		 Object Nominal geocentric
distance (AU) [note 2] 		Nominal geocentric
distance (LD)		Size (m)
(approximate)		(H)
(abs. mag)		Closer
approach
to Moon 		Refs [1] [2]
2009-02-022009-02-042009 CC20.00123 AU (184,000 km; 114,000 mi)0.487.3–1627.8 data  · 2009 CC2
2009-02-272009-03-032009 EJ10.00041 AU (61,000 km; 38,000 mi)0.165.6–1228.4 data  · 2009 EJ1
2009-03-022009-02-272009 DD450.00048 AU (72,000 km; 45,000 mi)0.1918–4125.8 data  · 2009 DD45
2009-03-062009-03-022009 EW0.00227 AU (340,000 km; 211,000 mi)0.8814–3126.4 data  · 2009 EW
2009-03-182009-03-172009 FH0.00057 AU (85,000 km; 53,000 mi)0.2213–2826.6 data  · 2009 FH
2009-03-192009-03-172009 FK0.00250 AU (374,000 km; 232,000 mi)0.975.8–1328.3Yes data  · 2009 FK
2009-05-052009-05-04 2009 JF1 0.00196 AU (293,000 km; 182,000 mi)0.7610–2327.1Yes data  · 2009 JF1
2009-05-132009-05-122009 JL20.00177 AU (265,000 km; 165,000 mi)0.6917–3826.0 data  · 2009 JL2
2009-06-012009-05-312009 KR210.00190 AU (284,000 km; 177,000 mi)0.7412–2726.7Yes data  · 2009 KR21
2009-10-012009-10-022009 TB0.00046 AU (69,000 km; 43,000 mi)0.183.8–8.629.2 data  · 2009 TB
2009-10-052009-10-092009 TD170.00173 AU (259,000 km; 161,000 mi)0.677.7–1727.7 data  · 2009 TD17
2009-10-082009-10-102009 TU0.00204 AU (305,000 km; 190,000 mi)0.799.2–2127.3 data  · 2009 TU
2009-10-172009-10-152009 TM80.00232 AU (347,000 km; 216,000 mi)0.905.6–1228.4 data  · 2009 TM8
2009-11-062009-11-06 2009 VA 0.00014 AU (21,000 km; 13,000 mi)0.055.1–1128.6 data  · 2009 VA
2009-11-122009-11-102009 VZ390.00174 AU (260,000 km; 162,000 mi)0.686.5–1428.1Yes? [note 3] data  · 2009 VZ39
2009-11-152009-11-182009 WP60.00176 AU (263,000 km; 164,000 mi)0.6912–2626.8 data  · 2009 WP6
2009-11-162009-11-182009 WQ60.00235 AU (352,000 km; 218,000 mi)0.913.8–8.629.2 data  · 2009 WQ6
2009-11-202009-11-192009 WJ60.00119 AU (178,000 km; 111,000 mi)0.468.8–2027.4 data  · 2009 WJ6
2009-11-242009-11-232009 WV510.00101 AU (151,000 km; 94,000 mi)0.3910–2327.1 data  · 2009 WV51

Warning Times by Size

This table visualizes the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of each pie chart show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based around the absolute magnitude of each asteroid, an approximate measure of size based on brightness.

Absolute Magnitude
CommentsRelative Size
(size of a person for comparison)
Silhouette of man standing and facing forward.svg
Absolute Magnitude 29-30


Absolute Magnitude 28-29


Absolute Magnitude 27-28


Absolute Magnitude 26-27


Absolute Magnitude 25-26 (Largest)


Notes

  1. ↑ For a list of current Earth close approaches see NEO Earth Close Approaches
  2. ↑ Distance from the center of Earth to the center of the object. See the NASA/JPL Solar System Dynamics Glossary: Geocentric. Earth has a radius of approximately 6,400 km.
  3. ↑ The orbit of 2009 VZ39 is known quite poorly- it could have passed as closely as 0.029 and as far as 3.1 LD from Earth, as well as anything from 3.4 LD to colliding head-on with the Moon. As such, the values are based on the nominal calculations. Considering a fireball would likely be noticed if it had collided with the Moon, as it would have created a crater over 150 meters in diameter, it can probably be concluded that the actual orbit was not too far from the nominal one- with a closest approach somewhere between 0.5 and 0.8 lunar distances.

Additional examples

An example list of near-Earth asteroids that passed more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2009.

See also

Related Research Articles

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2020 LD is an Apollo near-Earth asteroid roughly 140 meters in diameter. It was discovered on 7 June 2020 when the asteroid was about 0.03 AU from Earth and had a solar elongation of 154 degrees. The glare of the Sun had masked the approach of the asteroid since November 2019. The asteroid passed closest approach to Earth on 5 June 2020 at a distance of 0.002 AU. The close approach distance is now known with an accuracy of roughly ± 1000 km. This is the largest asteroid to pass closer than the Moon this year and possibly the largest since (308635) 2005 YU55 in November 2011. The asteroid makes close approaches to Mercury, Venus, Earth, and Mars. It will be brighter than apparent magnitude 24 until 18 July 2020.

References

  1. ↑ "JPL Small-Body Database Browser". JPL Solar System Dynamics. NASA Jet Propulsion Laboratory.
  2. ↑ "MPC Database". IAU Minor Planet Center. International Astronomical Union. Retrieved 1 January 2021.
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