29 Amphitrite
29 Amphitrite is one of the biggest S-type asteroids, probably third in diameter after Eunomia and Juno, although Iris and Herculina are similar in size.
| Discovery | |
|---|---|
| Discovered by | A. Marth |
| Discovery date | March 1, 1854 |
| Designations | |
| A899 NG | |
| Main belt | |
| Orbital characteristics | |
| Epoch June 14, 2006 (JD 2453900.5) | |
| Aphelion | 409.809 Gm (2.739 AU) |
| Perihelion | 354.398 Gm (2.369 AU) |
| 382.103 Gm (2.554 AU) | |
| Eccentricity | 0.073 |
| 1491.013 d (4.08 a) | |
Average orbital speed | 18.61 km/s |
| 229.662° | |
| Inclination | 6.096° |
| 356.501° | |
| 63.433° | |
| Physical characteristics | |
| Dimensions | 212.2 km |
| Mass | 1.0×1019 kg |
Mean density | 2.0 g/cm³ |
| 0.0593 m/s² | |
| 0.1122 km/s | |
| 0.2246 d (5.390 h) [1] | |
| Albedo | 0.1793 (geometric) [2] |
| Temperature | ~170 K |
Spectral type | S |
| 8.58 to 11.38 | |
| 5.85 | |
| 0.21" to 0.078" | |
It is probably not a fully solid body, since its density is too low for a solid silicate object and much lower than Eunomia or Juno. Its orbit is less eccentric and inclined than those of its bigger cousins - being indeed the most circular of any asteroid found up to that point - and as a consequence it never becomes as bright as Iris or Hebe, especially as it is much farther from the Sun than those asteroids. It can reach magnitudes of around +8.6 at a favorable opposition, but more usually is around the binocular limit of +9.5.
Amphitrite was found by Albert Marth on March 1, 1854. It was the only asteroid he found. It is named after Amphitrite, a sea goddess in Greek mythology.
References
change- ↑ PSI.edu
- ↑ "PSI.edu - Albedos". Archived from the original on 2012-06-27. Retrieved 2007-12-19.
- ↑ Tedesco, E. F. (March 1979). "Binary Asteroids: Evidence for Their Existence from Lightcurves". Science, New Series. 203 (4383): 905–907. Bibcode:1979Sci...203..905T. doi:10.1126/science.203.4383.905. PMID 17771729. S2CID 19431574.
- ↑ van Flandern, T. C.; Tedesco, Edward F.; Binzel, Richard P. (1979). "Satellites of asteroids". Asteroids. Tucson, AZ: University of Arizona Press. pp. 443–465. Bibcode:1979aste.book..443V.
Other websites
change- Orbital simulation from JPL (Java) / Ephemeris