BD -21°5081

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BD -21°5081
Stellar characteristics
Right ascension (Epoch J2000)18h 38m 53.40s
Declination (Epoch J2000)-21° 03' 06.70"
Spectral typeG5 V
Distance from Sol42.3 ly
Other designationsHR 6998, Gl 722, Hip 91438, HD 172051, BD -21°5081, SAO 187086.
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BD -21°5081 is located about 42.3 light-years from Sol. This southern star lies in the western part of the constellation Sagittarius, the Archer. BD -21°5081 is a yellow-orange main sequence dwarf star of spectral and luminosity type G5 V. The star may have a mass similar to that of Sol, 93 percent of its diameter[1], and 65 percent of its luminosity.

For an Earth-type planet around BD -21°5081 to have liquid water at its surface, it would need a stable orbit centered around 0.81 AU -- between the orbital distances of Venus and Earth in the Solar System. Such a planet would have an orbital period less than one Earth year.

(Data from


  1. (Johnson and Wright, 1983, page 691)