Epoch J2000.0 Equinox J2000.0
|Right ascension||7h 31m 48.40s|
|Declination||+17° 05′ 09.8″|
|Apparent magnitude (V)||+5.45|
|B−V color index||1.135|
|Radial velocity (Rv)||–40.2 km/s|
|Proper motion (μ)||RA: 41.29 ± 0.28 mas/yr
Dec.: -74.80 ± 0.17 mas/yr
|Parallax (π)||10.32 ± 0.28 mas|
|Distance||316 ± 9 ly
(97 ± 3 pc)
|Absolute magnitude (MV)||0.62|
|Radius||11.62 ± 0.34 R☉|
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.
(in order from star)
- van Leeuwen, F. (2007). "HIP 36616". Hipparcos, the New Reduction. Retrieved 2010-04-04.
- Mitchell, D.; Frink, S.; Quirrenbach, A.; Fischer, D.; Marcy, G.; Butler, P. (2003). "Four Substellar Companions Found Around Nearby K Giant Stars". Bulletin of the American Astronomical Society. 35: 1234. Bibcode:2003AAS...203.1703M.
- "HD 59686". The Extrasolar Planets Encyclopaedia.