List of asteroid close approaches to Earth in 2008

A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2008, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).^[1]

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 2008.

This list and the relevant databases do not consider impacts on Earth as close approaches. The impact of 2008 TC3 was the first successfully predicted asteroid impact, while the impact of several small asteroids in Earth's atmosphere were observed visually or recorded by sensors designed to detect the detonation of nuclear devices as bolides.

     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)

Date of closest approach	Date discovered	Object	Nominal geocentric distance (AU)[note 1]	Nominal geocentric distance (LD)	Size (m) (approximate)	(H) (abs. mag.)	Closer approach to Moon	Refs[2][3]
2008-01-13	2008-01-10	2008 AF3	0.00252 AU (377,000 km; 234,000 mi)	0.98	16–36	26.1		data · 2008 AF3
2008-01-16	2008-01-19	2008 BW2	0.00238 AU (356,000 km; 221,000 mi)	0.93	3.1–6.8	29.7		data · 2008 BW2
2008-01-31	2008-01-30	2008 BC15	0.00198 AU (296,000 km; 184,000 mi)	0.77	13–28	26.6	Yes	data · 2008 BC15
2008-02-05	2008-02-03	2008 CT1	0.000887 AU (132,700 km; 82,500 mi)	0.35	7.7–17	27.7		data · 2008 CT1
2008-02-15	2008-02-09	2008 CK70	0.00248 AU (371,000 km; 231,000 mi)	0.97	28–62	24.9		data · 2008 CK70
2008-03-09	2008-03-07	2008 EZ7	0.00108 AU (162,000 km; 100,000 mi)	0.42	11–24	27.0		data · 2008 EZ7
2008-03-10	2008-03-11	2008 EF32	0.000442 AU (66,100 km; 41,100 mi)	0.17	3.5–7.8	29.4		data · 2008 EF32
2008-03-10	2008-03-08	2008 EM68	0.00149 AU (223,000 km; 139,000 mi)	0.58	8.4–19	27.5		data · 2008 EM68
2008-03-23	2008-03-27	2008 FK	0.00217 AU (325,000 km; 202,000 mi)	0.84	9.2–21	27.3	Yes	data · 2008 FK
2008-03-29	2008-03-28	2008 FP	0.00114 AU (171,000 km; 106,000 mi)	0.44	15–33	26.3		data · 2008 FP
2008-04-03	2008-04-06	2008 GM2	0.00139 AU (208,000 km; 129,000 mi)	0.54	5.8–13	28.3		data · 2008 GM2
2008-04-07	2008-04-05	2008 GF1	0.00196 AU (293,000 km; 182,000 mi)	0.76	5.8–13	28.3	Yes	data · 2008 GF1
2008-05-10	2008-05-11	2008 JL24	0.00115 AU (172,000 km; 107,000 mi)	0.45	3.2–7.1	29.6	Yes	data · 2008 JL24
2008-07-29	2008-07-30	2008 OT7	0.00116 AU (174,000 km; 108,000 mi)	0.45	10–23	27.1		data · 2008 OT7
2008-10-03	2008-10-08	2008 TN9	0.00165 AU (247,000 km; 153,000 mi)	0.64	7.3–16	27.8		data · 2008 TN9
2008-10-09	2008-10-09	2008 TS26	0.0000845 AU (12,640 km; 7,850 mi)	0.03	0.61–1.4	33.2		data · 2008 TS26
2008-10-18	2008-10-29	2008 UA202	0.00223 AU (334,000 km; 207,000 mi)	0.87	3.5–7.8	29.4		data · 2008 UA202
2008-10-20	2008-10-21	2008 US	0.000220 AU (32,900 km; 20,500 mi)	0.09	1.4–3.1	31.4		data · 2008 US
2008-10-22	2008-10-22	2008 UM1	0.000572 AU (85,600 km; 53,200 mi)	0.22	1.0–2.3	32.1		data · 2008 UM1
2008-11-03	2008-11-03	2008 VM	0.000309 AU (46,200 km; 28,700 mi)	0.12	2.4–5.4	30.2		data · 2008 VM

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)

(size of a person for comparison)

Absolute magnitude 30 > H ≥ 29

Absolute magnitude 29 > H ≥ 28

Absolute magnitude 28 > H ≥ 27

Absolute magnitude 27 > H ≥ 26

Absolute magnitude 26 > H ≥ 25

None

Absolute magnitude 25 > H (largest)

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.

• List of asteroid close approaches to Earth
• List of asteroid close approaches to Earth in 2000-2007
• List of asteroid close approaches to Earth in 2009