Rhea (minor planet designation: 577 Rhea) is a minor planet orbiting the sun. It is named after Rhea, one of the Titans in Greek mythology. The name may have been inspired by the asteroid's provisional designation 1905 RH.
![]() Modelled shape of Rhea from its lightcurve | |
Discovery | |
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Discovered by | M. F. Wolf |
Discovery site | Heidelberg |
Discovery date | 20 October 1905 |
Designations | |
MPC designation | (577) Rhea |
Pronunciation | /ˈriːə/[1] |
Alternative designations | 1905 RH |
Orbital characteristics[2] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 110.32 yr (40296 d) |
Aphelion | 3.5931 AU (537.52 Gm) |
Perihelion | 2.6297 AU (393.40 Gm) |
Semi-major axis | 3.1114 AU (465.46 Gm) |
Eccentricity | 0.15481 |
Orbital period (sidereal) | 5.49 yr (2004.6 d) |
Mean anomaly | 105.219° |
Mean motion | 0° 10m 46.524s / day |
Inclination | 5.2964° |
Longitude of ascending node | 328.579° |
Argument of perihelion | 330.784° |
Physical characteristics | |
Mean radius | 19.765±1.15 km |
Synodic rotation period | 12.249 h (0.5104 d) |
Geometric albedo | 0.1792±0.023 |
Absolute magnitude (H) | 9.4 |
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