(153814) 2001 WN5

(153814) 2001 WN5
Discovery [1]
Discovered by LONEOS
Discovery site Anderson Mesa Stn.
Discovery date 20 November 2001
Designations
MPC designation (153814) 2001 WN5
2001 WN5
NEO · PHA · Apollo [1]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 21.88 yr (7,990 days)
Aphelion 2.5114 AU
Perihelion 0.9125 AU
1.7119 AU
Eccentricity 0.4670
2.24 yr (818 days)
46.227°
0° 26m 24s / day
Inclination 1.9197°
277.51°
44.569°
Earth MOID 0.0015 AU · 0.6 LD
Physical characteristics
Mean diameter
 0.932±0.011 km[2]
0.097±0.016[2]
18.3[1]

    (153814) 2001 WN5 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.

    Description

    Nominal orbit of 2001 WN5 (green line) passing the Earth–Moon system in June 2028

    It was discovered by the Lowell Observatory Near-Earth-Object Search at Anderson Mesa Station on 20 November 2001,[3] The potentially hazardous asteroid was removed from the Sentry Risk Table on January 30, 2002.[4]

    There are precovery images dating back to February 10, 1996.[1] The orbit is well determined with an observation arc of 14.9 years which includes two radar delay observations. It has an Uncertainty Parameter of 0.[1]

    The asteroid will pass within 250,000 km (0.65 lunar distances) from the Earth on June 26, 2028.[5] During the close approach, the asteroid should peak at about apparent magnitude 6.7,[6] and will be visible in binoculars. It has an absolute magnitude (H) of 18.2.[1]

    According to observations by the NEOWISE mission, the asteroid measures approximately 0.9 km in diameter and its surface has a rather low albedo of 0.097.[2]

    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[7]data
    69230 Hermes1942-04-261.6511.6511.65117.5700-900[7]data
    (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. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 153814 (2001 WN5)" (2017-12-26 last obs.). Jet Propulsion Laboratory. Retrieved 13 January 2018.
    2. 1 2 3 Mainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results". The Astrophysical Journal. 743 (2): 17. arXiv:1109.6400. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156. Retrieved 13 January 2018.
    3. ↑ "153814 (2001 WN5)". Minor Planet Center. Retrieved 13 January 2018.
    4. ↑ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2011-10-16.
    5. ↑ "JPL Close-Approach Data: 153814 (2001 WN5)" (2011-01-04 last obs and observation arc=14.9 years). Retrieved 2011-10-16.
    6. ↑ "2001WN5 Ephemerides for 26 Jun 2028". NEODyS (Near Earth Objects - Dynamic Site). Retrieved 2011-10-16.
    7. 1 2 Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Retrieved 24 August 2018.
    Preceded by
    367943 Duende (2012 DA14)    		 Large NEO Earth close approach
    (inside the orbit of the Moon)
    26 June 2028    		 Succeeded by
    99942 Apophis
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