Global Information331 Etheridgea information
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 1 April 1892 |
| Designations | |
MPC designation | (331) Etheridgea |
| Pronunciation | /ˌɛθəˈrɪdʒiə/ |
Named after | Possibly Robert Etheridge |
Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.95 yr (45,274 d) |
| Aphelion | 3.32623 AU (497.597 Gm) |
| Perihelion | 2.72055 AU (406.988 Gm) |
Semi-major axis | 3.02339 AU (452.293 Gm) |
| Eccentricity | 0.10016 |
Orbital period (sidereal) | 5.26 yr (1,920.2 d) |
Mean anomaly | 88.5392° |
Mean motion | 0° 11m 14.939s / day |
| Inclination | 6.05385° |
Longitude of ascending node | 22.0346° |
Argument of perihelion | 333.055° |
| Physical characteristics | |
| Dimensions | 74.92±2.7 km |
Synodic rotation period | 25.315 h (1.0548 d) |
Geometric albedo | 0.0447±0.003 |
Absolute magnitude (H) | 9.62 |
Etheridgea (minor planet designation: 331 Etheridgea) is a large main belt asteroid.[1] It was discovered by Auguste Charlois on 1 April 1892 in Nice. The meaning of the name is unknown.[2] This asteroid is orbiting the Sun at a distance of 3.02 AU with a period of 5.26 years and an eccentricity (ovalness) of 0.10. The orbital plane is tilted at an angle of 6.05° to the plane of the ecliptic.[1]
Analysis of the asteroid light curve generated from photometric data collected in 2015 provided a rotation period of 25.315±0.001 h. This result is completely different from the previous rotation period estimates.[3] It is a low albedo, carbonaceous C-type asteroid and spans a girth of 74.9±2.7 km.[4]
It may have been named for the geologist and paleontologist Robert Etheridge (1819–1903).[5][6]
- ^ a b c Cite error: The named reference
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Schmadel2009was invoked but never defined (see the help page). - ^ Cite error: The named reference
Pilcher2016was invoked but never defined (see the help page). - ^ Cite error: The named reference
Fornasier_et_al_2014was invoked but never defined (see the help page). - ^ "April 01 – Discovery of Asteroid 331 Etheridgea (1892)". 1 April 2020.
- ^ Room, A. (1988). Dictionary of Astronomical Names. United Kingdom: Routledge.