(163132) 2002 CU11
Discovery[1]
Discovered byLINEAR
Discovery date7 February 2002
Designations
(163132) 2002 CU11
NEO · PHA · Apollo[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc4600 days (12.59 yr)
Aphelion1.5795 AU (236.29 Gm)
Perihelion0.85959 AU (128.593 Gm)
1.2196 AU (182.45 Gm)
Eccentricity0.29517
1.35 yr (491.94 d)
47.609°
0° 43m 54.48s / day (n)
Inclination48.782°
157.77°
110.54°
Earth MOID0.00189035 AU (282,792 km)
Physical characteristics
Mean diameter
0.460±0.017 km[2][3]
0.730 km (assumed)[4]
Mass5.3×1011 kg (assumed)
0.408±0.061[2]
18.5[2]

(163132) 2002 CU11, provisional designation 2002 CU11, is a bright, sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.[2] Based on absolute magnitude, it is the second largest asteroid known to have passed closer than the Moon.[5]

Description

2002 CU11 was discovered on 7 February 2002 by Lincoln Near-Earth Asteroid Research (LINEAR) at an apparent magnitude of 19 using a 1.0-meter (39 in) reflecting telescope.[1] It has an estimated diameter of 730 meters (2,400 ft).[4] The asteroid was listed on Sentry Risk Table with a Torino Scale rating of 1 on 20 March 2002.[4]

With an observation arc of 44 days, (163132) 2002 CU11 showed a 1 in 9,300 chance of impacting Earth in 2049.[6] It was removed from the Sentry Risk Table on 26 April 2002.[7] It is now known that on 3 September 2049 the asteroid will be 0.0843 AU (12,610,000 km; 7,840,000 mi) from Earth.[8]

Even though using an epoch of 27 June 2015 gives 2002 CU11 an Earth-MOID of 0.0000093 AU (1,390 km; 860 mi),[2] the asteroid does not make any threatening approaches to Earth in the foreseeable future.

Notable close-approaches to Earth[8]
Date Distance from Earth
1925-08-30 0.0023 AU (340,000 km; 210,000 mi)
2014-08-30 0.0346 AU (5,180,000 km; 3,220,000 mi)
2049-09-03 0.0843 AU (12,610,000 km; 7,840,000 mi)
2080-08-31 0.0042 AU (630,000 km; 390,000 mi)

The close approach of 2080 will cause an uncertainty of 4 minutes for the close approach time of 2084.[8]

History of close approaches of large near-Earth objects since 1908 (A)
PHA Date Approach distance in lunar distances Abs. mag
(H) 		Diameter (C)
(m) 		Ref (D)
Nominal(B) Minimum Maximum
(152680) 1998 KJ9 1914-12-31 0.606 0.604 0.608 19.4 279–900 data
(458732) 2011 MD5 1918-09-17 0.911 0.909 0.913 17.9 556–1795 data
(163132) 2002 CU11 1925-08-30 0.903 0.901 0.905 18.5 443–477 data
69230 Hermes 1937-10-30 1.926 1.926 1.927 17.5 700-900[9] data
69230 Hermes 1942-04-26 1.651 1.651 1.651 17.5 700-900[9] data
2017 NM6 1959-07-12 1.89 1.846 1.934 18.8 580–1300 data
(27002) 1998 DV9 1975-01-31 1.762 1.761 1.762 18.1 507–1637 data
2002 NY40 2002-08-18 1.371 1.371 1.371 19.0 335–1082 data
2004 XP14 2006-07-03 1.125 1.125 1.125 19.3 292–942 data
2015 TB145 2015-10-31 1.266 1.266 1.266 20.0 620-690 data
(137108) 1999 AN10 2027-08-07 1.014 1.010 1.019 17.9 556–1793 data
(153814) 2001 WN5 2028-06-26 0.647 0.647 0.647 18.2 921–943 data
99942 Apophis 2029-04-13 0.0981 0.0963 0.1000 19.7 310–340 data
2017 MB1 2072-07-26 1.216 1.215 2.759 18.8 367–1186 data
2011 SM68 2072-10-17 1.875 1.865 1.886 19.6 254–820 data
(163132) 2002 CU11 2080-08-31 1.655 1.654 1.656 18.5 443–477 data
(416801) 1998 MZ 2116-11-26 1.068 1.068 1.069 19.2 305–986 data
(153201) 2000 WO107 2140-12-01 0.634 0.631 0.637 19.3 427–593 data
(276033) 2002 AJ129 2172-02-08 1.783 1.775 1.792 18.7 385–1242 data
(290772) 2005 VC 2198-05-05 1.951 1.791 2.134 17.6 638–2061 data
(A) This list includes near-Earth approaches of less than 2 lunar distances (LD) of objects with H brighter than 20.
(B) Nominal geocentric distance from the center of Earth to the center of the object (Earth has a radius of approximately 6,400 km).
(C) Diameter: estimated, theoretical mean-diameter based on H and albedo range between X and Y.
(D) Reference: data source from the JPL SBDB, with AU converted into LD (1 AU≈390 LD)
(E) Color codes:   unobserved at close approach   observed during close approach   upcoming approaches

References

  1. ^ a b "MPEC 2002-C44 : 2002 CU11". IAU Minor Planet Center. 8 February 2002. Retrieved 18 September 2013. (K02C11U)
  2. ^ a b c d e f g "JPL Small-Body Database Browser: 163132 (2002 CU11)" (2010-08-11 last obs and observation arc=8.5 years). Jet Propulsion Laboratory. Archived from the original on 28 May 2019. Retrieved 7 April 2016.
  3. ^ "LCDB Data for (163132) 2002 CU11". Asteroid Lightcurve Database (LCDB). Retrieved 16 June 2020.
  4. ^ a b c "Current Impact Risks (2002 CU11)". Near-Earth Object Program. NASA. 21 March 2002. Archived from the original on 21 March 2002.
  5. ^ NEO Earth Close Approaches @ JPL CNEOS
    Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"
  6. ^ Andrea Milani; Giovanni Valsecchi & Maria Eugenia Sansaturio (2002). "The problem with 2002 CU11". Spaceguard / Tumbling Stone. Archived from the original on 4 March 2016. Retrieved 18 September 2013.
  7. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 18 September 2013.
  8. ^ a b c "JPL Close-Approach Data: 163132 (2002 CU11)" (2010-08-11 last obs and observation arc=8.5 years). Retrieved 18 September 2013.
  9. ^ a b Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved 24 August 2018.

External links

Preceded by(152680) 1998 KJ9 Large NEO Earth close approach(inside the orbit of the Moon) 30 August 1925 Succeeded by2002 JE9
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