42 Draconis b

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Exoplanet
42 Draconis b (Orbitar)
Constellation Dragon
Position
equinox : J2000.0
Right ascension 18h 25m 59.13734s
declination + 65 ° 33 ′ 48.5288 ″
Orbit data
Central star 42 Draconis (Fafnir)
Major semi-axis 1.19 ± 0.01 AU
eccentricity 0.38 ± 0.06
Period of circulation 479.1 ± 6.2 d
Further data
Minimum dimensions 3.88 ± 0.85 M J
distance 97.3 ± 5 pc
history
discovery Döllinger et al.
Date of discovery 2009

42 Draconis b (also abbreviated 42 Dra b ), the net name Orbitar is a Exoplanet that the approximately 317 light-years from the sun away giant Red 42 Draconis ( Fafnir ) in the constellation Dragon orbits.

Origin of name

42 After a public IAU competition, Draconis b received the proper name Orbitar on December 15, 2015 in addition to its systematic designation ; this on the basis of a proposal by the Brevard Astronomical Society , an astronomical association from Brevard County in Florida ( USA ). The name is a self-invented made-up word and is intended to honor NASA's activities in space travel.

discovery

The planet was discovered as part of a three-year measurement campaign by a team led by the German astronomer Michaela Döllinger with the Alfred Jensch telescope of the Thuringian State Observatory Tautenburg , during which the radial speeds of 62 red giant stars of spectral class K were precisely measured. In March 2009, the discovery of two planets around the stars 42 Draconis and HD 139357 was finally published.

properties

According to model calculations, 42 Draconis b has a minimum mass of slightly less than four Jupiter's masses and orbits 42 Draconis every 479 days in an eccentric orbit with an orbital radius of about 1.2 AU . Because of its large mass, it must be a gas giant .

Individual evidence

  1. ↑ SIMBAD: Fafnir. Retrieved January 3, 2016 .
  2. ↑ a b c d e The Extrasolar Planets Encyclopaedia: Planet 42 Dra b. Retrieved January 3, 2016 .
  3. ^ A b International Astronomical Union: NameExoWorlds - The Approved Names. Retrieved January 3, 2016 .
  4. ↑ a b c Doellinger, MP, et al .: Planetary companion candidates around the K giant stars 42 Dra and HD 139357 . arxiv : 0903.3593 .