Hellenica World

HD 210702

HD 210702 is an orange subgiant star located approximately 179 light-years away in the constellation of Pegasus. With a mass of 1.8 times that of the Sun, the star spent its main-sequence life as an A-type star. The visual luminosity is 11.38 times that of the Sun and it is 182.4 light years away. The magnitude is near the naked-eye limit, but binoculars can easily see it.

The star shows variability in its radial velocity consistent with a planet-mass companion in a Keplerian orbit,[2] and one was duly discovered in April 2007, from observations at Lick and Keck Observatories in Mount Hamilton (California) and Mauna Kea (Hawai'i), USA.

The HD 210702 system[2]
(in order from star)
Mass Semimajor axis
Orbital period
b >2.0 MJ 1.17 341.1 ± 7 0.152 ± 0.08

See also

* HD 175541
* HD 192699
* List of extrasolar planets


1. ^ a b c d e van Leeuwen, F. (2007). "HIP 109577". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=109208. Retrieved 2010-12-25.
2. ^ a b Johnson et al.; Fischer, Debra A.; Marcy, Geoffrey W.; Wright, Jason T.; Driscoll, Peter; Butler, R. Paul; Hekker, Saskia; Reffert, Sabine et al. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal 665 (1): 785–793. doi:10.1086/519677. http://www.iop.org/EJ/article/0004-637X/665/1/785/71436.html.

* "HR 8461". http://webviz.u-strasbg.fr/. http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%208461.

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