69230 Hermes

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69230 Hermes
Synodic rotation period
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

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]

Discovery

Hermes was discovered by German astronomer

lost asteroid.[17] It thus did not receive a number, but Reinmuth nevertheless named it after the Greek god Hermes. It was the third unnumbered but named asteroid, having only the provisional designation 1937 UB. The two others long lost were (1862) Apollo, discovered in 1932 and numbered in 1973, and (2101) Adonis, discovered in 1936 and numbered in 1977.[18]

On 15 October 2003,

LONEOS project made an asteroid observation that, when the orbit was calculated backwards in time (by Timothy B. Spahr, Steven Chesley and Paul Chodas), turned out to be a rediscovery of Hermes. It has been assigned sequential number 69230. Additional precovery observations were published by the Minor Planet Center, the earliest being found in images taken serendipitously by the MPG/ESO 2.2-m La Silla telescope on 16 September 2000.[1]

Naming

This

M.P.C. 50255).[19]

Orbit and classification

Hermes is an

Venus-crosser. Frequent close approaches to both Earth and Venus make it unusually challenging to forecast its orbit more than a century in advance, though there is no impact risk within that timeframe.[20]

Close approaches

Animation of 69230 Hermes's orbit - close approach in 1942
   Sun ·    Earth ·   69230 Hermes

The asteroid has an Earth

magnitude
.

History of close approaches of large near-Earth objects since 1908 (A)
PHA
 Date Approach distance (
lunar dist.
)
H
) 		Diameter (C)
(
m
) 		Ref (D)
Nomi-
nal(B) 		Mini-
mum 		Maxi-
mum
(33342) 1998 WT24 1908-12-16 3.542 3.537 3.547 17.9 556–1795 data
(458732) 2011 MD5 1918-09-17 0.911 0.909 0.913 17.9 556–1795 data
(7482) 1994 PC1 1933-01-17 2.927 2.927 2.928 16.8 749–1357 data
69230 Hermes 1937-10-30 1.926 1.926 1.927 17.5 668–2158 data
69230 Hermes 1942-04-26 1.651 1.651 1.651 17.5 668–2158 data
(137108) 1999 AN10 1946-08-07 2.432 2.429 2.435 17.9 556–1795 data
(33342) 1998 WT24 1956-12-16 3.523 3.523 3.523 17.9 556–1795 data
(163243) 2002 FB3 1961-04-12 4.903 4.900 4.906 16.4 1669–1695 data
(192642) 1999 RD32 1969-08-27 3.627 3.625 3.630 16.3 1161–3750 data
(143651) 2003 QO104 1981-05-18 2.761 2.760 2.761 16.0 1333–4306 data
2017 CH1 1992-06-05 4.691 3.391 6.037 17.9 556–1795 data
(170086) 2002 XR14 1995-06-24 4.259 4.259 4.260 18.0 531–1714 data
(33342) 1998 WT24 2001-12-16 4.859 4.859 4.859 17.9 556–1795 data
4179 Toutatis 2004-09-29 4.031 4.031 4.031 15.3 2440–2450 data
2014 JO25
 2017-04-19 4.573 4.573 4.573 17.8 582–1879 data
(137108) 1999 AN10 2027-08-07 1.014 1.010 1.019 17.9 556–1795 data
(35396) 1997 XF11 2028-10-26 2.417 2.417 2.418 16.9 881–2845 data
(154276) 2002 SY50 2071-10-30 3.415 3.412 3.418 17.6 714–1406 data
(164121) 2003 YT1 2073-04-29 4.409 4.409 4.409 16.2 1167–2267 data
(385343) 2002 LV 2076-08-04 4.184 4.183 4.185 16.6 1011–3266 data
(52768) 1998 OR2 2079-04-16 4.611 4.611 4.612 15.8 1462–4721 data
(33342) 1998 WT24 2099-12-18 4.919 4.919 4.919 17.9 556–1795 data
(85182) 1991 AQ 2130-01-27 4.140 4.139 4.141 17.1 1100 data
314082 Dryope
 2186-07-16 3.709 2.996 4.786 17.5 668–2158 data
(137126) 1999 CF9 2192-08-21 4.970 4.967 4.973 18.0 531–1714 data
(290772) 2005 VC 2198-05-05 1.951 1.791 2.134 17.6 638–2061 data
(A) List includes near-Earth approaches of less than 5
JPL SBDB, with AU
converted into LD (1 AU≈390 LD)
(E) Color codes:   unobserved at close approach   observed during close approach   upcoming approaches

Physical characteristics

Spectral type

Hermes is a stony

Richard Binzel.[13][b] It has been characterized as a Sq-subtype using the SpeX instrument at NASA Infrared Telescope Facility. Sq-types transition to the Q-type asteroid.[14]

Lightcurves

Three rotational

U=3/3/3).[15][11][12]
[a]

Binary system

Arecibo radar image from 19 October 2003, showing the relative motion of the components.[9]

Radar observations led by

Hill radius of 35 km.[8]

The two components are in double synchronous rotation (similar to the trans-Neptunian system Pluto and Charon).[9] Hermes is one of only four systems of that kind known in the near-Earth object population. The other three are 1994 CJ1, (190166) 2005 UP156, and 2017 YE5.[22]

In popular culture

In the 1978 novel The Hermes Fall by John Baxter, the asteroid endangers the Earth in 1980.[23] It is not explicitly made clear as to whether or not the Hermes asteroid from The Hermes Fall is 69230 Hermes.

Notes

  1. ^
    Palmer Divide Observatory, Brian D. Warner (2003). Summary figures at LCDB
    .
  2. ^ a b Infrared spectroscopic observations of 69230 Hermes (1937 UB): possible unweathered endmember among ordinary chondrite analogs

References

  1. ^ a b c d e "69230 Hermes (1937 UB)". Minor Planet Center. Retrieved 12 March 2017.
  2. ^ "Hermes". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. ^
    ISBN 978-3-540-34361-5
    .
  4. ^ a b c d e "JPL Small-Body Database Browser: 69230 Hermes (1937 UB)" (2018-10-05 last obs.). Jet Propulsion Laboratory. Retrieved 30 October 2018.
  5. ^ a b c d e Johnston, Robert (20 September 2014). "(69230) Hermes". johnstonsarchive.net. Retrieved 28 June 2017.
  6. ^
    hdl:2060/20130014861
    . Retrieved 28 June 2017.
  7. ^ a b c d e "LCDB Data for (69230) Hermes". Asteroid Lightcurve Database (LCDB). Retrieved 28 June 2017.
  8. ^ a b "(69230) Hermes". Asteroids with Satellites Database – Johnston's Archive. Retrieved 13 September 2017.
  9. ^ a b c d Margot, Jean-Luc. "Radar observations of long-lost asteroid 1937 UB (Hermes)". Earth, Planetary, and Space Sciences. UCLA. Archived from the original on 11 August 2006. Retrieved 13 September 2017.
  10. ^
    Bibcode:2003IAUC.8227....2M
    . Retrieved 28 June 2017.
  11. ^
    doi:10.1016/j.icarus.2005.10.014
    . Retrieved 28 June 2017.
  12. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (69230) Hermes". Geneva Observatory. Retrieved 28 June 2017.
  13. ^
    doi:10.1016/j.icarus.2004.07.006
    . Retrieved 28 June 2017.
  14. ^
    hdl:2060/20140012047
    . Retrieved 28 June 2017.
  15. ^
    Bibcode:2003IAUC.8233....3P
    . Retrieved 28 June 2017.
  16. doi:10.1016/j.icarus.2012.07.026
    . Retrieved 28 June 2017.
  17. ^ a b Brian G. Marsden (29 March 1998). "How the Asteroid Story Hit: An Astronomer Reveals How a Discovery Spun Out of Control". Minor Planet Center and Boston Globe newspaper. Retrieved 30 November 2017.
  18. ^ D. Schmadel, Dictionary of Minor Planet Names
  19. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 June 2017.
  20. ^ https://science.nasa.gov/science-news/science-at-nasa/2003/31oct_hermes "The Curious Tale of Asteroid Hermes." Retrieved 27/12/2017.
  21. ^ a b "JPL Close-Approach Data: 69230 Hermes (1937 UB)" (2011-08-20 last obs (arc=73.82 years)). Retrieved 12 November 2011.
  22. ^ "Goldstone Radar Observations Planning: 2001 QP153 and 2005 UP156". Goldstone observatory. Retrieved 13 September 2017.
  23. ISBN 978-0-586-04610-4
    .

External links
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