205 Martha
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 13 October 1879 |
| Designations | |
| MPC designation | (205) Martha |
|
Named after
|
Martha |
| Main belt | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.51 yr (49860 d) |
| Aphelion | 2.8758 AU (430.21 Gm) |
| Perihelion | 2.6783 AU (400.67 Gm) |
| 2.7771 AU (415.45 Gm) | |
| Eccentricity | 0.035571 |
| 4.63 yr (1690.3 d) | |
|
Average orbital speed
|
17.87 km/s |
| 198.37° | |
| 0° 12m 46.692s / day | |
| Inclination | 10.696° |
| 211.792° | |
| 177.281° | |
| Earth MOID | 1.6818 AU (251.59 Gm) |
| Jupiter MOID | 2.28738 AU (342.187 Gm) |
| Jupiter Tisserand parameter | 3.309 |
| Physical characteristics | |
| Dimensions | 80.58±1.4 km |
| 14.911 h (0.6213 d) | |
| 0.0553±0.002 | |
| C | |
| 9.23 | |
205 Martha is a large main belt asteroid. It is a dark, primitive carbonaceous C-type asteroid. This object was discovered by Johann Palisa on October 13, 1879, in Pola and was named after Martha, a woman in the New Testament.
Efforts to determine the rotation period for this asteroid have produced wildly different results, in large part because the actual period is close to half of an Earth day. A study performed during 2013 showed that the light curve changed significantly during the observation period, adding to the difficulty. This study gave a synodic rotation period of 14.905 ± 0.001 h.
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