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

(153814) 2001 WN5
Discovery [1]
Discovered byLONEOS
Discovery siteAnderson Mesa Stn.
Discovery date20 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 arc21.88 yr (7,990 days)
Aphelion2.5114 AU
Perihelion0.9125 AU
1.7119 AU
Eccentricity0.4670
2.24 yr (818 days)
46.227°
0° 26m 24s / day
Inclination1.9197°
277.51°
44.569°
Earth MOID0.0015 AU · 0.6 LD
Physical characteristics
Mean diameter
0.932±0.011 km[2]
0.097±0.016[2]
18.3[1]

DescriptionEdit

 
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 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[7] data
69230 Hermes 1942-04-26 1.651 1.651 1.651 17.5 700-900[7] 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

ReferencesEdit

  1. ^ a b c d e f g "JPL Small-Body Database Browser: 153814 (2001 WN5)" (2017-12-26 last obs.). Jet Propulsion Laboratory. Retrieved 13 January 2018.
  2. ^ a b c 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. ^ 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. Retrieved 24 August 2018.

External linksEdit