130 Elektra

130 Elektra
Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	February 17, 1873
Designations
Alternative designations
Minor planet category	Main belt
Orbital characteristics
	Epoch December 31, 2006 (JD 2454100.5)
Aphelion	565.778 Gm (3.782 AU)
Perihelion	369.263 Gm (2.468 AU)
Semi-major axis	467.521 Gm (3.125 AU)
Eccentricity	0.210
Orbital period	2017.954 d (5.52 a)
Average orbital speed	16.66 km/s
Mean anomaly	225.604°
Inclination	22.838°
Longitude of ascending node	145.635°
Argument of perihelion	234.753°
Known satellites	S/2003 (130) 1
Physical characteristics
Dimensions	215×155 ± 12 km
Mass	1.28±0.10×1019 kg
Mean density	3.8 ± 0.3 g/cm³
Equatorial surface gravity	0.07 m/s²
Equatorial escape velocity	0.13 km/s
Sidereal rotation period	0.230103 d (5.52247 h)
Axial tilt	157°
Pole ecliptic latitude	-88°
Pole ecliptic longitude	68°
Geometric albedo	0.076 ± 0.011
Spectral type	G
Absolute magnitude (H)	7.12

S/2003 (130) 1
Discovery
Discovered by	W. J. Merline, P. M. Tamblyn,; C. Dumas, L. M. Close,; C. R. Chapman, and F. Menard
Discovery date	15 August, 2003
Designations
Minor planet category	Main belt
Orbital characteristics
Semi-major axis	1252 ± 30 km
Eccentricity	unknown, likely small
Orbital period	3.92 ± 0.03 d
Average orbital speed	23 m/s
Inclination	uncertain
Satellite of	130 Elektra
Physical characteristics
Dimensions	6 ± 2 km
Mass	~4×1014 kg
Equatorial escape velocity	~ 4 m/s
Absolute magnitude (H)	14.5

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)[change | change source]

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]

References[change | change source]

↑ "Organic Matter on Asteroid 130 Elektra". Science. 238 (4824): 183–184. 1987. Bibcode:1987Sci...238..183C. doi:10.1126/science.238.4824.183. PMID 17800458. S2CID 46168765. {{cite journal}}: Cite uses deprecated parameter |authors= (help)
↑ ^2.0 ^2.1 ^2.2 ^2.3 F. Marchis; et al. (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. PMC 2600456. PMID 19081813.
↑ ^3.0 ^3.1 ^3.2 130 Elektra and S/2003 (130) 1, orbit data website maintained by F. Marchis. Archived 2007-07-24 at the Wayback Machine
↑ "IAUC 8183". Archived from the original on 2006-05-01. Retrieved 2007-12-25.
↑ Assuming a similar density to the primary.
↑ Discovery Circumstances: Numbered Minor Planets, Minor Planet Centre Archived 2008-05-10 at the Wayback Machine
↑ ASTORB^{[permanent dead link]} orbital elements database, Lowell Observatory
↑ Based in IRAS mean diameter of 182±12 km, a/b ratio of 1.4 as per the following references
↑ ^9.0 ^9.1 "Supplemental IRAS Minor Planet Survey". Archived from the original on 2010-01-17. Retrieved 2007-12-25.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
↑ PDS node spin vector database(in particular, the synthetic compiled value of a/b=1.4). Archived 2008-05-15 at the Wayback Machine
↑ (130) Elektra and S/2003 (130) 1, at Johnston's archive (maintained by W. R. Johnston). Archived 2011-06-03 at the Wayback Machine
↑ 130 Elektra and S/2003 (130) 1, F. Marchis Archived 2007-07-24 at the Wayback Machine
↑ Error estimate derived from consideration of $M\propto a^{3}/P^{2}$ and given errors in a and P. See propagation of uncertainty.
↑ ^14.0 ^14.1 On the extremities of the long axis.
↑ F. Marchis; et al. (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. PMC 2600456. PMID 19081813.
↑ Supplemental IRAS minor planet survey Archived 2009-08-17 at the Wayback Machine
↑ PDS node taxonomy database Archived 2007-03-10 at the Wayback Machine

Other websites[change | change source]

130 Elektra and S/2003 (130) 1, orbit data website maintained by F. Marchis. Includes adaptive optics image of primary, and satellite orbit diagram.
Data on (130) Elektra from Johnston's archive (maintained by W. R. Johnston)

[CruBro87-1] "Organic Matter on Asteroid 130 Elektra". Science. 238 (4824): 183–184. 1987. Bibcode:1987Sci...238..183C. doi:10.1126/science.238.4824.183. PMID 17800458. S2CID 46168765. {{cite journal}}: Cite uses deprecated parameter |authors= (help)

[MarKaaHom06-2] 2.0 ^2.1 ^2.2 ^2.3 F. Marchis; et al. (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. PMC 2600456. PMID 19081813.

[marchis-3] 3.0 ^3.1 ^3.2 130 Elektra and S/2003 (130) 1, orbit data website maintained by F. Marchis. Archived 2007-07-24 at the Wayback Machine

[iauc8183-4] "IAUC 8183". Archived from the original on 2006-05-01. Retrieved 2007-12-25.

[mass-5] Assuming a similar density to the primary.

[6] Discovery Circumstances: Numbered Minor Planets, Minor Planet Centre Archived 2008-05-10 at the Wayback Machine

[7] ASTORB^{[permanent dead link]} orbital elements database, Lowell Observatory

[about-8] Based in IRAS mean diameter of 182±12 km, a/b ratio of 1.4 as per the following references

[IRAS-9] 9.0 ^9.1 "Supplemental IRAS Minor Planet Survey". Archived from the original on 2010-01-17. Retrieved 2007-12-25.{{cite web}}: CS1 maint: bot: original URL status unknown (link)

[pds_spin-10] PDS node spin vector database(in particular, the synthetic compiled value of a/b=1.4). Archived 2008-05-15 at the Wayback Machine

[johnston-11] (130) Elektra and S/2003 (130) 1, at Johnston's archive (maintained by W. R. Johnston). Archived 2011-06-03 at the Wayback Machine

[berkeley-12] 130 Elektra and S/2003 (130) 1, F. Marchis Archived 2007-07-24 at the Wayback Machine

[error-13] Error estimate derived from consideration of $M\propto a^{3}/P^{2}$ and given errors in a and P. See propagation of uncertainty.

[pointyend-14] 14.0 ^14.1 On the extremities of the long axis.

[harvard39-15] F. Marchis; et al. (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. PMC 2600456. PMID 19081813.

[psi-16] Supplemental IRAS minor planet survey Archived 2009-08-17 at the Wayback Machine

[PDStax-17] PDS node taxonomy database Archived 2007-03-10 at the Wayback Machine

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