1355 Magoeba

1355 Magoeba

Discovery
Discovered by	C. Jackson
Discovery site	Johannesburg Obs.
Discovery date	30 April 1935
Designations
MPC designation	1355 Magoeba
Named after	Magoeba (a native chief)
Alternative names	1935 HE
Minor planet category	main-belt (inner) · Hungaria
Orbital characteristics
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc	79.86 yr (29,170 days)
Aphelion	1.9367 AU
Perihelion	1.7705 AU
Semi-major axis	1.8536 AU
Eccentricity	0.0448
Orbital period	2.52 yr (922 days)
Mean anomaly	293.62°
Inclination	22.823°
Longitude of ascending node	225.26°
Argument of perihelion	340.17°
Physical characteristics
Dimensions	4.828±0.094 km 5.96 km (calculated)
Rotation period	2.9712 h 32.9±0.1 h 31.65±0.005 h 5.99±0.05 h 2.972±0.002 h
Geometric albedo	0.267±0.095 0.4663±0.0824 0.3 (assumed)
Spectral type	B–V = 0.713 U–B = 0.255 Tholen = X X
Absolute magnitude (H)	13.05

1355 Magoeba, provisional designation 1935 HE, is a bright asteroid from the inner regions of the asteroid belt, about 5 kilometers in diameter. It was discovered on 30 April 1935, by English-born, South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, South Africa.

The asteroid is a member of the Hungaria family, that form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.8–1.9 AU once every 2 years and 6 months (922 days). Its orbit shows an eccentricity of 0.04 and is significantly tilted by 23 degrees to the plane of the ecliptic.

The body's rotation around its own axis has been measured several times at the Palmer Divide Observatory (see video in § External links) with divergent results. A more recent light-curve observation in September 2014 found a rotation period of 2.971 hours significantly shorter than some previous photometric observations. The X-type asteroid has a bright geometric albedo between 0.27 and 0.47. While observations at the Argentinian Lencito Complex in 2007 categorize the asteroid in the metallic M-type class, bodies with an albedo above 0.30 are usually not classified as metallic M-types but rather as E or Xe subtypes.

The minor planet was named after Magoeba, a native chief of the North Transvaal in South Africa.

External links

• The Palmer Divide Observatory: Tour given by Brian Warner on YouTube (time 4:03 min.)
• Asteroid Lightcurve Database (LCDB), query form (info)
• 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
• 1355 Magoeba at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters

• Dynamical evolution of the Hungaria asteroids