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130 Elektra




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130 Elektra is a very big farther main belt asteroid. It was found by C. H. F. Peters on February 17, 1873 and named after Electra, an avenger in Greek mythology.

Its spectrum is of the G type, so it is probably made up like Ceres. Spectral signatures of organic compounds have been seen on Elektra's surface [1]

Recent optical sightings have found a moon (see below). Using its orbit, Elektra's mass can be found more correctly. The value of 1.3×1019 kg indicates an unusually high density (for asteroids) of 3.8 ± 0.3 g/cm³. Optical sightings have also determined that Elektra's shape is quite non-spherical, as well as giving indications of albedo differences of 5-15% on its surface.[2]

Moon (S/2003 (130) 1)

In 2003, a small moon of Elektra was detected using the Keck II telescope. The diameter of the moon is 4 km and it orbits at a distance of about 1170 km. The moon has been given the provisional designation S/2003 (130) 1. Due to only a few sightings to date, its orbit is still not well known [3]

S/2003 (130) 1
Discovery[4]
Discovered byW. J. Merline, P. M. Tamblyn,
C. Dumas, L. M. Close,
C. R. Chapman, and F. Menard
Discovery date15 August, 2003
Designations
Main belt
Orbital characteristics[3]
1252 ± 30 km
Eccentricityunknown, likely small
3.92 ± 0.03 d
23 m/s
Inclinationuncertain
Satellite of130 Elektra
Physical characteristics
Dimensions6 ± 2 km [2]
Mass~4×1014 kg [5]
Equatorial escape velocity
~ 4 m/s
14.5[2]

130 Elektra
Discovery[6]
Discovered byChristian Heinrich Friedrich Peters
Discovery dateFebruary 17, 1873
Designations
 
Main belt
Orbital characteristics[7]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion565.778 Gm (3.782 AU)
Perihelion369.263 Gm (2.468 AU)
467.521 Gm (3.125 AU)
Eccentricity0.210
2017.954 d (5.52 a)
16.66 km/s
225.604°
Inclination22.838°
145.635°
234.753°
Known satellitesS/2003 (130) 1
Physical characteristics
Dimensions215×155 ± 12 km[8][9][10][11]
Mass1.28±0.10×1019 kg [12][13]
Mean density
3.8 ± 0.3 g/cm³ [3]
Equatorial surface gravity
0.07 m/s²[14]
Equatorial escape velocity
0.13 km/s[14]
0.230103 d (5.52247 h)[15]
157°
-88°[2]
68°
0.076 ± 0.011 [16]
Surface temp. min mean max
Kelvin ~157 251
Celsius -23°
G [17]
7.12 [9]

References

  1. D.P. Cruikshank and R.H. Brown (1987). "Organic Matter on Asteroid 130 Elektra". Science 238: 183. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1987Sci...238..183C&db_key=AST&data_type=HTML&format=&high=444b66a47d14088. 
  2. 2.0 2.1 2.2 2.3 F. Marchis (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus 185 (1): 39–63. doi:10.1016/j.icarus.2006.06.001 . PMC 2600456 . PMID 19081813 . 
  3. 3.0 3.1 3.2 130 Elektra and S/2003 (130) 1, orbit data website maintained by F. Marchis. Archived 2010-01-17 at WebCite
  4. "IAUC 8183". http://cfa-www.harvard.edu/iauc/08100/08183.html#Item1. 
  5. Assuming a similar density to the primary.
  6. Discovery Circumstances: Numbered Minor Planets, Minor Planet Centre Archived 2007-06-21 at WebCite
  7. ASTORB orbital elements database, Lowell Observatory
  8. Based in IRAS mean diameter of 182±12 km, a/b ratio of 1.4 as per the following references
  9. 9.0 9.1 "Supplemental IRAS Minor Planet Survey". http://www.psi.edu/pds/resource/imps.html. 
  10. PDS node spin vector database(in particular, the synthetic compiled value of a/b=1.4). Archived 2010-01-17 at WebCite
  11. (130) Elektra and S/2003 (130) 1, at Johnston's archive (maintained by W. R. Johnston). Archived 2011-05-26 at WebCite
  12. 130 Elektra and S/2003 (130) 1, F. Marchis Archived 2010-01-17 at WebCite
  13. Error estimate derived from consideration of [math]M \propto a^3/P^2[/math] and given errors in a and P. See propagation of uncertainty.
  14. 14.0 14.1 On the extremities of the long axis.
  15. F. Marchis (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus 185: 39. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006Icar..185...39M&db_key=AST&data_type=HTML&format=&high=444b66a47d32271. 
  16. Supplemental IRAS minor planet survey Archived 2010-01-17 at WebCite
  17. PDS node taxonomy database Archived 2010-01-17 at WebCite

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