205 Martha

205 Martha
Discovery
Discovered by	Johann Palisa
Discovery date	13 October 1879
Designations
MPC designation	(205) Martha
Pronunciation	/ˈmɑːrθə/
Named after	Martha
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°
Argument of perihelion	177.281°
Physical characteristics
Dimensions	80.58±1.4 km
Synodic rotation period	14.911 h (0.6213 d)
Geometric albedo	0.0553±0.002
Spectral type	C
Absolute magnitude (H)	9.23

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.

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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
205 Martha at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by .

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[jpldata-2] "205 Martha". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[mpb41_1_47-3] 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.

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