List of asteroid close approaches to Earth in 2009

Below is the list of asteroid close approaches to 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, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).

The CNEOS database of close approaches lists some close approaches a full orbit or more before the discovery of the object, derived by orbit calculation. The list below only includes close approaches that are evidenced by observations, thus the pre-discovery close approaches would only be included if the object was found by precovery, but there was no such close approach in 2009.

This list and the relevant databases do not consider impacts as close approaches, thus this list does not include any of the objects that collided with Earth's atmosphere in 2009, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices.

     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 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 H ≥ 30 (smallest)

None

Absolute magnitude 30 > H ≥ 29

(size of a person for comparison)

Absolute magnitude 28-29

Absolute magnitude 28 > H ≥ 27

Absolute magnitude 27 > H ≥ 26

Absolute magnitude 26 > H ≥ 25

•   After closest approach: 0 (0.0%)
•   < 24 hours before: 0 (0.0%)
•   up to 7 days before: 1 (100.0%)
•   > one week before: 0 (0.0%)
•   > 7 weeks before: 0 (0.0%)
•   > one year before: 0 (0.0%)

Absolute magnitude 25 > H (largest)

None

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.

• (136849) 1998 CS1 (~990 meters in diameter) passed 11.33 Lunar distances (4.4 million km) from Earth on 17 January 2009.
• (208023) 1999 AQ₁₀ (~285 meters in diameter) passed 4.39 Lunar distances (1.7 million km) from Earth on 18 February 2009.
• 2009 FW₄ (~41 meters in diameter) passed 2.82 Lunar distances (1.1 million km) from Earth on 17 March 2009.
• 2009 DO₁₁₁ (~95 meters in diameter) passed 1.22 Lunar distances (468,000 km) from Earth on 20 March 2009.
• (410777) 2009 FD (472 meters in diameter) passed 1.62 Lunar distances (624,000 km) from Earth on 27 March 2009.
• (136617) 1994 CC (~990 meters in diameter) passed 6.55 Lunar distances (2.5 million km) from Earth on 10 June 2009.
• 2009 MU (~41 meters in diameter) passed 2.31 Lunar distances (889,000 km) from Earth on 24 June 2009.
• 2009 RY₃ (~41 meters in diameter) passed 1.94 Lunar distances (745,000 km) from Earth on 11 September 2009.
• 2009 SH₁ (~5 meters in diameter) may have passed as close as 1.01 Lunar distances (390,000 km) from Earth on 14 September 2009, but the nominal orbit suggests an approach nearer to 2.40 LD (922,000 km).
• (68216) 2001 CV₂₆ (1277 meters in diameter) passed 9.79 Lunar distances (3.8 million km) from Earth on 8 October 2009.
• (159402) 1999 AP₁₀ (~2067 meters in diameter) passed 29.68 Lunar distances (11.4 million km) from Earth on 20 October 2009.
• 2009 WV₂₅ (~54 meters in diameter) passed 2.91 Lunar distances (112,000 km) from Earth on 1 December 2009.

• List of asteroid close approaches to Earth
• List of asteroid close approaches to Earth in 2008
• List of asteroid close approaches to Earth in 2010