(250) Bettina

from Wikipedia, the free encyclopedia
Asteroid
(250) Bettina
Properties of the orbit ( animation )
Orbit type Outer main belt
Major semi-axis 3.149  AU
eccentricity 0.132
Perihelion - aphelion 2.732 AU - 3.566 AU
Inclination of the orbit plane 12.8 °
Length of the ascending node 23.9 °
Argument of the periapsis 76.7 °
Time of passage of the perihelion September 12, 2015
Sidereal period 5 a 214 d
Mean orbital velocity 16.7 km / s
Physical Properties
Medium diameter 121 km
Albedo 0.112
Rotation period 5 h 3 min
Absolute brightness 7.58 mag
Spectral class M.
history
Explorer Johann Palisa
Date of discovery September 3, 1885
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(250) Bettina is an asteroid of the outer main asteroid belt , which on 3 September 1885 by Johann Palisa at the observatory of Vienna was discovered. The asteroid was named after Bettina von Rothschild, the wife of Albert Salomon Anselm von Rothschild , who bought the naming rights for £ 50. Due to its spectral characteristics, Bettina is an M-type asteroid .

Orbit data

Bettina's light curve. The apparent brightness is shown .
An estimate of Bettina's geometry from the light curve

Bettina moves at a distance of 2.7325 ( perihelion ) to 3.5657 ( aphelion ) astronomical units around the sun in 5.59 years . The orbit is inclined 12.8194 ° to the ecliptic , the orbital eccentricity is 0.1323.

properties

Bettina has a mean diameter of around 121 kilometers and a light surface with an albedo of 0.112. Similar to many M-type asteroids, the reflection spectrum is flat and largely structureless. Bettina's light curve shows an irregular behavior with a rotation period of around 5 hours and 3 minutes and a brightness change of 0.17 ± 0.01 mag .

See also

Individual evidence

  1. Paul Murdin: Rock Legends: The Asteroids and Their Discoverers . Springer, 13 July 2016, ISBN 978-3-319-31836-3 , pp. 86–.
  2. ^ CI Lagerkvist, H. Rickman: The spin periods of M asteroids , Moon and the Planets 24: 437-440 (1981). bibcode : 1981M & P .... 24..437L
  3. P. Handersen et al .: The M- / X-asteroid menagerie: Results of an NIR spectral survey of 45 main-belt asteroids , Meteoritics and Planetary Science 46 (12): 1910-1938 (2011). doi : 10.1111 / j.1945-5100.2011.01304.x
  4. ^ E. Dotto et al .: M-type asteroids - Rotational properties of 16 objects , Astronomy and Astrophysics Supplement Series 95 (2): 195-211 (1992). bibcode : 1992A & AS ... 95..195D
  5. (250) Bettina in the Small-Body Database of the Jet Propulsion Laboratory (English).