74 Galatea
Galatea (minor planet designation: 74 Galatea) is a large C-type main-belt asteroid. Its carbonaceous surface is very dark in color with an albedo of just 0.034. Galatea was found by the prolific comet discoverer Ernst Tempel on August 29, 1862, in Marseilles, France. It was his third asteroid discovery. It is named after one of the two Galateas in Greek mythology. A stellar occultation by Galatea was observed on September 8, 1987. The name Galatea has also been given to one of Neptune's satellites.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | August 29, 1862 |
| Designations | |
MPC designation | (74) Galatea |
| Pronunciation | /ɡæləˈtiːə/ |
Named after | Galatea |
Minor planet category | Main belt |
| Adjectives | Galatean |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 515.376 Gm (3.445 AU) |
| Perihelion | 315.937 Gm (2.112 AU) |
Semi-major axis | 415.657 Gm (2.778 AU) |
| Eccentricity | 0.240 |
Orbital period (sidereal) | 1691.658 d (4.63 a) |
Mean anomaly | 36.838° |
| Inclination | 4.075° |
Longitude of ascending node | 197.313° |
| 174.519° | |
| Physical characteristics | |
| Dimensions | 120.67 ± 7.15 km |
| Mass | (6.13 ± 5.36) × 1018 kg |
Mean density | 6.66 ± 5.94 g/cm3 |
Synodic rotation period | 17.270 h |
| 0.043 | |
| C | |
| 8.66 | |
Photometric observations of this asteroid made during 2008 at the Organ Mesa Observatory in Las Cruces, New Mexico gave a light curve with a period of 17.270 ± 0.002 hours and a brightness variation of 0.08 ± 0.01 in magnitude. The curve displays four minima and four maxima. The spectra of the asteroid does not display evidence of aqueous alteration.