149 Medusa
A three-dimensional model of 149 Medusa based on its light curve.
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Discovery[1] | |
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Discovered by | Henri Joseph Perrotin |
Discovery date | September 21, 1875 |
Designations | |
Named after
|
Medusa |
Main belt | |
Orbital characteristics[2][3] | |
Epoch December 31, 2006 (JD 2454100.5) | |
Aphelion | 346.542 Gm (2.316 AU) |
Perihelion | 304.026 Gm (2.032 AU) |
325.284 Gm (2.174 AU) | |
Eccentricity | 0.065 |
1171.128 d (3.21 yr) | |
Average orbital speed
|
20.18 km/s |
284.523° | |
Inclination | 0.937° |
159.647° | |
251.134° | |
Physical characteristics | |
Dimensions | 19.7 km |
Mass | 8.0×1015 kg |
Mean density
|
2.0 g/cm³ |
Equatorial surface gravity
|
0.0055 m/s² |
Equatorial escape velocity
|
0.0104 km/s |
26.038 h [4] | |
0.10 | |
Temperature | ~ 189 K |
S | |
10.79 | |
149 Medusa is a bright-coloured, stony main-belt asteroid that was discovered by French astronomer J. Perrotin on September 21, 1875, and named after the Gorgon Medusa, a snake-haired monster in Greek mythology.
When it was discovered, Medusa was by far the smallest asteroid found (although this was not known at that time). Since then, many thousands of smaller asteroids have been found. It was also the closest asteroid to the Sun discovered up to that point, beating the long-held record of 8 Flora. It remained the closest asteroid to the Sun until 433 Eros and 434 Hungaria were found in 1898, leading to the discovery of two new families of asteroids inward from the 4:1 Kirkwood gap which forms the boundary of the main belt.
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico, during 2010 gave a light curve with a rather long rotation period of 26.038 ± 0.002 hours and a brightness variation of 0.56 ± 0.03 in magnitude.[4]
References
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