29 Amphitrite

29 Amphitrite
Discovered by A. Marth
Discovery date March 1, 1854
Alternative names A899 NG
Minor planet
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)
Semi-major axis 382.103 Gm (2.554 AU)
Eccentricity 0.073
Orbital period 1491.013 d (4.08 a)
Average orbital speed 18.61 km/s
Mean anomaly 229.662°
Inclination 6.096°
Longitude of ascending node 356.501°
Argument of perihelion 63.433°
Physical characteristics
Dimensions 212.2 km
Mass 1.0×1019 kg
Mean density 2.0 g/cm³
Equatorial surface gravity 0.0593 m/s²
Escape velocity 0.1122 km/s
Rotation period 0.2246 d (5.390 h) [1]
Albedo 0.1793 (geometric) [2]
Temperature ~170 K
Spectral type S
Apparent magnitude 8.58 to 11.38
Absolute magnitude 5.85
Angular diameter 0.21" to 0.078"

29 Amphitrite (pronounced /ˌæmfɪˈtraɪti/, Greek: Αμφιτρίτη) is one of the largest S-type asteroids, probably third in diameter after Eunomia and Juno, although Iris and Herculina are similar in size.

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 larger cousins - being indeed the most circular of any asteroid discovered up to that point - and as a consequence it never becomes as bright as Iris or Hebe, especially as it is much further 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 discovered by Albert Marth on March 1, 1854. It was his only asteroid discovery. It is named after Amphitrite, a sea goddess in Greek mythology.

A satellite is suspected based on the lightcurve data.[1] [2]


1. ^ Tedesco, E. F. (March 1979). "Binary Asteroids: Evidence for Their Existence from Lightcurves". Science, New Series 203 (4383): 905-907.

2. ^ van Flandern, T. C.; Tedesco, E. F.; Binzel, R. P. (1979). "Satellites of asteroids". 'Asteroids': 443-465, Tucson, AZ: University of Arizona Press.


* Orbital simulation from JPL (Java) / Ephemeris

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