15 Sagittae
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| 15 Sadittae | |
| Stellar characteristics | |
|---|---|
| Constellation | Sagitta |
| Right ascension (Epoch J2000) | 20h 4m 6.2s |
| Declination (Epoch J2000) | +17° 4' 12.6" |
| Spectral type | G1 V |
| Distance from Sol | 57.6 ± 0.02 ly |
| Other designations | 15 Sge, HR 7672, Gl 779, Hip 98819, HD 190406, BD+16 4121, SAO 105635, LHS 3515, LTT 15872, LFT 1517, Wolf 866 |
15 Sagittae is a yellow-orange main sequence dwarf star of spectral and luminosity type G1 V. The star may have a mass near that of Sol's, 1.1 times its diameter, and 1.3 times its luminosity. It exhibits higher chromospheric activity than Sol and appears to be one to three billion years old -- substantially younger than Sol's 4.6 billion years (press release), and one analysis of isochrones suggests that the star may only be 2.0 billion years old (Guinan et al, 1999).
The SIMBAD Astronomical Database identifies 15 Sge as a variable star, and it has been given the New Suspected Variable designation NSV 12757. The star has as many as four visual companions that are not bound to it.
Past radial velocity analysis suggests that giant planets of one tenth to 10 times the mass of Jupiter do not exist within 0.1 to four AUs of 15 Sge (Cummings et al, 1999). Moreover, the brown dwarf companion to 15 Sge may eventually prove to have a highly circular orbit that is coplanar with the circumstellar disk so that planets formed in inner orbits around the star. If so, then conditions would be more favorable for the existence of stable orbit for an Earth-like planet (with liquid water) centered around 1.15 AU from around 15 Sge -- between the orbital distances of Earth and Mars in the Solar System. Assuming that 15 Sge has a mass equal to Sol's, then such a planet would have an orbital period of about 450 days, or just over 1.2 years.
(Data from SolStation.com)
