205 Martha
Martha (minor planet designation: 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 13 October 1879, in Pola and was named after Martha, a woman in the New Testament.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 13 October 1879 |
| Designations | |
MPC designation | (205) Martha |
| Pronunciation | /ˈmɑːrθə/ |
Named after | Martha of Bethany |
Alternative designations | A879 TB |
Minor planet category | 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) |
Semi-major axis | 2.7771 AU (415.45 Gm) |
| Eccentricity | 0.035571 |
Orbital period (sidereal) | 4.63 yr (1690.3 d) |
Average orbital speed | 17.87 km/s |
Mean anomaly | 198.37° |
Mean motion | 0° 12m 46.692s / day |
| Inclination | 10.696° |
Longitude of ascending node | 211.792° |
| 177.281° | |
| Physical characteristics | |
| Dimensions | 80.58±1.4 km |
Synodic rotation period | 14.911 h (0.6213 d) |
| 0.0553±0.002 | |
| C | |
| 9.23 | |
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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