HD 20781 d

HD 20781 d
An artist's impression of HD 20781 d orbiting its host star.
Discovery[1]
Discovered byMayor et al.
Discovery siteLa Silla Observatory[2]
Discovery date2011
Doppler spectroscopy (HARPS)
Orbital characteristics[3]
Periastron0.15 AU
Apoastron0.18 AU
0.1647+0.0076
−0.0083 AU
Eccentricity0.11+0.05
−0.06
29.1580+0.0102
−0.0100 d
2,455,511.3258+2.4394
−2.4382 JD
60.99°+30.79°
−30.03°
Semi-amplitude2.82+0.17
−0.16 m/s
Physical characteristics
~3.18 R🜨 (estimate)[2]
Mass≥10.61+1.20
−1.19 M🜨[3]

HD 20781 d is an extrasolar planet orbiting the K-type main-sequence star HD 20781 117 light years away in the southern constellation Fornax. It was discovered in 2011 during a survey for southern exoplanets conducted with HARPS[1] using doppler spectroscopy, the radial velocity variations caused by the gravitational pull of the planet. Its existence was confirmed in another survey during 2017.[3]

  1. ^ a b Cite error: The named reference Mayor2011 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Brennan was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Udry2019 was invoked but never defined (see the help page).