70 Virginis b

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Exoplanet
70 Virginis b

Artist's impression of 70 Virginis b

Artist's impression of 70 Virginis b
Constellation Virgin
Position
equinox : J2000.0
Right ascension 13h 28m 25.81s
declination + 13 ° 46 ′ 43.6 ″
Orbit data
Central star 70 Virginis
Major semi-axis 0.481 ± 0.003 AU
eccentricity 0.399 ± 0.002
Period of circulation 116.6926 ± 0.0014 d
Further data
Minimum dimensions 7.40 ± 0.02 M J
distance 18.1 ± 0.2 pc
history
discovery Geoffrey Marcy , R. Paul Butler
Date of discovery 1996

70 Virginis b is an exoplanet that the approximately 59 light-years from the sun away Yellow Dwarf 70 Virginis in the constellation Virgo orbits. He is assigned to the group of eccentric Jupiter .

discovery

The planet was discovered on December 30, 1995 by R. Paul Butler and the discovery, along with that of 47 Ursae Majoris b , was announced by Geoffrey Marcy on January 17, 1996 at the meeting of the American Astronomical Society . The discovery was made using the radial velocity method . 70 Virginis b was the second discovered exoplanet around a main sequence star similar to the Sun , after the planet 51 Pegasi b, which was detected a few months earlier .

properties

The planet orbits 70 Virginis at a mean distance of around 0.481 astronomical units and has a high orbital eccentricity of around 0.4. As a result, its actual distance from the star fluctuates greatly within its orbit. Its minimum mass was initially given as 6.6 Jupiter's masses ; according to recent studies it is around 7.40 masses of Jupiter. The discoverers did not rule out that the mass of 70 Virginis b could also be significantly higher and that it is therefore a brown dwarf . The estimated effective temperature is 360 Kelvin .

Individual evidence

  1. ^ Van Leeuwen, F .: HIP 65721. Retrieved May 9, 2015 .
  2. ↑ a b c d NASA Exoplanet Archives: 70 Vir b. Retrieved May 9, 2015 .
  3. ↑ Piper, Sven: Exoplanets. The search for a second earth, Heidelberg 2014, p. 31f
  4. ↑ a b Kane, SR; Boyajian, TS; Henry, GW; Feng, YK; Hinkel, NR; Fischer, DA; von Braun, K .; Howard, AW; Wright, JT: A Comprehensive Characterization of the 70 Virginis Planetary System . arxiv : 1504.04066 .
  5. ↑ a b c Marcy, GW; Butler, P .: A Planetary Companion to 70 Virginis. Retrieved May 9, 2015 .