(163132) 2002 CU11

(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]

(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]

    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]
    DateDistance from Earth
    1925-08-300.0023 AU (340,000 km; 210,000 mi)
    2014-08-300.0346 AU (5,180,000 km; 3,220,000 mi)
    2049-09-030.0843 AU (12,610,000 km; 7,840,000 mi)
    2080-08-310.0042 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 KJ91914-12-310.6060.6040.60819.4279–900data
    (458732) 2011 MD51918-09-170.9110.9090.91317.9556–1795data
    (163132) 2002 CU111925-08-300.9030.9010.90518.5443–477data
    69230 Hermes1937-10-301.9261.9261.92717.5700-900[9]data
    69230 Hermes1942-04-261.6511.6511.65117.5700-900[9]data
    2017 NM61959-07-121.891.8461.93418.8580–1300data
    (27002) 1998 DV91975-01-311.7621.7611.76218.1507–1637data
    2002 NY402002-08-181.3711.3711.37119.0335–1082data
    2004 XP142006-07-031.1251.1251.12519.3292–942data
    2015 TB1452015-10-311.2661.2661.26620.0620-690data
    (137108) 1999 AN102027-08-071.0141.0101.01917.9556–1793data
    (153814) 2001 WN52028-06-260.6470.6470.64718.2921–943data
    99942 Apophis2029-04-130.09810.09630.100019.7310–340data
    2017 MB12072-07-261.2161.2152.75918.8367–1186data
    2011 SM682072-10-171.8751.8651.88619.6254–820data
    (163132) 2002 CU112080-08-311.6551.6541.65618.5443–477data
    (416801) 1998 MZ2116-11-261.0681.0681.06919.2305–986data
    (153201) 2000 WO1072140-12-010.6340.6310.63719.3427–593data
    (276033) 2002 AJ1292172-02-081.7831.7751.79218.7385–1242data
    (290772) 2005 VC2198-05-051.9511.7912.13417.6638–2061data
    (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. "MPEC 2002-C44 : 2002 CU11". IAU Minor Planet Center. 8 February 2002. Retrieved 18 September 2013. (K02C11U)
    2. "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. "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. "JPL Close-Approach Data: 163132 (2002 CU11)" (2010-08-11 last obs and observation arc=8.5 years). Retrieved 18 September 2013.
    9. 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.
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