69230 Hermes

69230 Hermes
Recovery of Hermes on 15 October 2003
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date28 October 1937
Designations
(69230) Hermes
Pronunciation/ˈhɜːrmiːz/[2]
Named after
Hermes (Greek mythology)[3]
1937 UB
NEO · PHA · Apollo [1][4]
Mars- and Venus-crosser
AdjectivesHermian, Hermean /ˈhɜːrmiən, hərˈmiːən/
Orbital characteristics [4]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc80.94 yr (29,565 d)
Earliest precovery date25 October 1937
Aphelion2.6878 AU
Perihelion0.6226 AU
1.6552 AU
Eccentricity0.6239
2.13 yr (778 d)
73.583°
0° 27m 46.08s / day
Inclination6.0670°
34.217°
92.746°
Known satellites1[5]
(P:13.892±0.006 h)[6][7]
(D: 0.54 km,[8] 0.56 km[9])
Earth MOID0.0043 AU (1.6752 LD)
Physical characteristics
0.8±0.1 km[6]
0.81 km (derived)[5]
0.85 km[7][10]
Mean density
1.6 g/cm3 (assumed)[5]
13.894 h[11][12][a]
0.25±0.12[5][11]
0.265±0.099[6]
S [13][b] · Sq [7][14]
17.48[6]
17.5[1][4]
17.55[15]
17.57[7][11][16]

69230 Hermes is a sub-kilometer sized asteroid and binary system on an eccentric orbit,[10] classified as a potentially hazardous asteroid and near-Earth object of the Apollo group, that passed Earth at approximately twice the distance of the Moon on 30 October 1937. The asteroid was named after Hermes from Greek mythology.[3] It is noted for having been the last remaining named lost asteroid, rediscovered in 2003. The S-type asteroid has a rotation period of 13.9 hours.[7] Its synchronous companion was discovered in 2003. The primary and secondary are similar in size; they measure approximately 810 meters (2,700 ft) and 540 meters (1,800 ft) in diameter, respectively.[5]

  1. ^ a b c Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ "Hermes". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. ^ a b Cite error: The named reference springer was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference jpldata was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference johnstonsarchive was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Marchis-2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference lcdb was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Johnson archive was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Radar Arecibo was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Margot-2003b was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Pravec-2006 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference geneva-obs was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Rivkin-2004 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Thomas-2014 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Pravec-2003b was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Pravec-2012b was invoked but never defined (see the help page).


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