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 | |
| (205) Martha | |
| Pronunciation | /ˈmɑːrθə/[1] |
Named after | Martha of Bethany |
| A879 TB | |
| Main belt | |
| Orbital characteristics[2] | |
| 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° | |
| Physical characteristics | |
| Dimensions | 80.58±1.4 km |
| 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.[3]
References
- Noah Webster (1884) A Practical Dictionary of the English Language
- "205 Martha". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
- Hawkins, Scot; Ditteon, Richard (January 2014), "Asteroid Lightcurve Analysis at the Oakley Observatory - May 2007", Minor Planet Bulletin, 41 (1): 47–49, Bibcode:2014MPBu...41...47P.
External links
- Lightcurve plot of 205 Martha, Palmer Divide Observatory, B. D. Warner (2010)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 205 Martha at AstDyS-2, Asteroids—Dynamic Site
- 205 Martha at the JPL Small-Body Database
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