List of asteroid close approaches to Earth in 2008

Below is the list of asteroid close approaches to Earth in 2008. 2008 was the first year that an asteroid was successfully detected before it impacted earth (2008 TC3 was the first successfully predicted asteroid impact).

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

After closest approach: 11 (52.4%)< 24 hours before: 2 (9.5%)up to 7 days before: 8 (38.1%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

  •   After closest approach: 11 (52.4%)
  •   < 24 hours before: 2 (9.5%)
  •   up to 7 days before: 8 (38.1%)
  •   > one week before: 0 (0.0%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 0 (0.0%)

Timeline of close approaches less than one lunar distance from Earth in 2008

A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2008.[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)

Apart from 2008 TC3, this list does not include any of the other objects that collided with earth in 2008 as they were not discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices.[note 2]

Date of
closest
approach		 Date
discovered		 Object Nominal geocentric
distance (AU)[note 3]		 Nominal geocentric
distance (LD)		 Size (m)
(approximate)		 (H)
(abs. mag)		 Closer
approach
to Moon		 Refs[1][2]
2008-01-132008-01-102008 AF30.00252 AU (377,000 km; 234,000 mi)0.9816–3626.1data · 2008 AF3
2008-01-162008-01-192008 BW20.00238 AU (356,000 km; 221,000 mi)0.933.1–6.829.7data · 2008 BW2
2008-01-312008-01-302008 BC150.00198 AU (296,000 km; 184,000 mi)0.7713–2826.6Yesdata · 2008 BC15
2008-02-052008-02-032008 CT10.00089 AU (133,000 km; 83,000 mi)0.357.7–1727.7data · 2008 CT1
2008-02-152008-02-092008 CK700.00248 AU (371,000 km; 231,000 mi)0.9728–6224.9data · 2008 CK70
2008-03-092008-03-072008 EZ70.00108 AU (162,000 km; 100,000 mi)0.4211–2427.0data · 2008 EZ7
2008-03-102008-03-112008 EF320.00044 AU (66,000 km; 41,000 mi)0.173.5–7.829.4data · 2008 EF32
2008-03-102008-03-082008 EM680.00148 AU (221,000 km; 138,000 mi)0.578.4–1927.5data · 2008 EM68
2008-03-232008-03-272008 FK0.00218 AU (326,000 km; 203,000 mi)0.859.2–2127.3Yesdata · 2008 FK
2008-03-292008-03-282008 FP0.00114 AU (171,000 km; 106,000 mi)0.4415–3326.3data · 2008 FP
2008-04-032008-04-062008 GM20.00139 AU (208,000 km; 129,000 mi)0.545.8–1328.3data · 2008 GM2
2008-04-072008-04-052008 GF10.00196 AU (293,000 km; 182,000 mi)0.765.8–1328.3Yesdata · 2008 GF1
2008-05-102008-05-112008 JL240.00115 AU (172,000 km; 107,000 mi)0.453.2–7.129.6Yesdata · 2008 JL24
2008-07-292008-07-302008 OT70.00116 AU (174,000 km; 108,000 mi)0.4510–2327.1data · 2008 OT7
2008-10-032008-10-082008 TN90.00165 AU (247,000 km; 153,000 mi)0.647.3–1627.8data · 2008 TN9
2008-10-072008-10-062008 TC3impactimpact4.130.4[3]data · 2008 TC3
2008-10-092008-10-092008 TS260.0000844 AU (12,630 km; 7,850 mi)0.030.61–1.433.2data · 2008 TS26
2008-10-182008-10-292008 UA2020.00223 AU (334,000 km; 207,000 mi)0.873.5–7.829.4data · 2008 UA202
2008-10-202008-10-212008 US0.00022 AU (33,000 km; 20,000 mi)0.091.4–3.131.4data · 2008 US
2008-10-222008-10-222008 UM10.00057 AU (85,000 km; 53,000 mi)0.221.0–2.332.1data · 2008 UM1
2008-11-032008-11-032008 VM0.00031 AU (46,000 km; 29,000 mi)0.122.4–5.430.2data · 2008 VM

Warning Times by Size

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

Abs Magnitude 30 and greater

Silhouette of man standing and facing forward

(size of a person for comparison)

After closest approach: 3 (60.0%)< 24 hours before: 2 (40.0%)up to 7 days before: 0 (0.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Abs Magnitude 29-30

After closest approach: 4 (100.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 0 (0.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 28-29

After closest approach: 1 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (50.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 27-28

After closest approach: 3 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 3 (50.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 26-27

After closest approach: 0 (0.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 3 (100.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude less than 25 (largest)

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%)

  •   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%)

Notes
  1. For a list of current Earth close approaches see NEO Earth Close Approaches
  2. Asteroids which collide with earth before being detected never receive a designation and do not appear in either the NASA or IAU lists of asteroids as there is no astrometry for them.
  3. 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.

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 2008.

  • 2007 TU24 (~250 meters in diameter) passed 1.44 LD (554,000 km) from Earth on January 29, 2008.
  • 2008 CE22 (~18 meters in diameter) passed between 0.9997 and 1.0023 LD (384,300 to 385,300 km) from Earth on February 6, 2008.
  • (450894) 2008 BT18 (~650 meters in diameter) passed 5.9 LD (2.3 million km) from Earth on July 14, 2008.
  • 2008 XK (~12 meters in diameter) may have passed as close as 0.23 LD (89,300 km) from Earth on December 5, 2008, but the nominal orbit suggests it passed nearer to 1.46 LD (560,500 km) from Earth instead.

See also

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.
  3. "JPL Small-Body Database Browser: (2008 TC3)" (last observation: 2008-10-07).
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