HD 59686

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HD 59686
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Gemini
Right ascension 7h 31m 48.40s[1]
Declination +17° 05′ 09.8″[1]
Apparent magnitude (V) +5.45
Spectral type K2III
B−V color index 1.135
Variable type “none”
Radial velocity (Rv) –40.2 km/s
Proper motion (μ) RA: 41.29 ± 0.28[1] mas/yr
Dec.: -74.80 ± 0.17[1] mas/yr
Parallax (π) 10.32 ± 0.28[1] mas
Distance 316 ± 9 ly
(97 ± 3 pc)
Absolute magnitude (MV) 0.62
Radius 11.62 ± 0.34 R
Other designations
BD+17º1596, GC 10073, GSC 01364-01582, HIP 36616, HR 2877, SAO 96985.
Database references

HD 59686 is a 5th magnitude star approximately 316 light years away in the constellation Gemini.


It is an orange giant meaning it has ceased fusing hydrogen in its core and on its way to becoming a red giant. The stellar radius is very large (11.6 times that of our Sun).

Planetary system[edit]

In November 2003, the planet was announced orbiting the giant star by Mitchell which he used Doppler spectrometer to look for effects on the star caused by the gravitational tug of the orbiting planet. Using the amplitude from the radial velocity method, he calculated the planetary mass as 5.25 Jupiter masses and with period 303 days. However the mass is only minimum because the inclination of the orbit is not known. Using the stellar mass and period, he calculated semimajor axis as 0.911 astronomical units. He found that the shape of the stellar wobble is circular, implying that the planet has zero eccentricity.

The HD 59686 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >5.25 MJ 0.911 303 0

See also[edit]


  1. ^ a b c d e van Leeuwen, F. (2007). "HIP 36616". Hipparcos, the New Reduction. Retrieved 2010-04-04. 

External links[edit]

  • "HD 59686". The Extrasolar Planets Encyclopaedia. 

Coordinates: Sky map 07h 31m 48.3969s, +17° 05′ 09.765″