HD 177830
Binary star system in the constellation Lyra / From Wikipedia, the free encyclopedia
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HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than the Sun, but cooler being a type K star. Therefore, it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun, but because of its distance, about 204 light years, it is not visible to the unaided eye. With binoculars it should be easily visible.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 05m 20.7732s[1] |
Declination | +25° 55′ 14.373″[1] |
Apparent magnitude (V) | 7.175 |
Characteristics | |
Spectral type | K0IV[2]/M4V[3] |
Astrometry | |
Radial velocity (Rv) | −71.86 ± 0.06[4] km/s |
Proper motion (μ) | RA: −41.248(12) mas/yr[1] Dec.: −52.580(17) mas/yr[1] |
Parallax (π) | 16.0063 ± 0.0165 mas[1] |
Distance | 203.8 ± 0.2 ly (62.48 ± 0.06 pc) |
Details | |
Mass | 1.48[5] M☉ |
Radius | 2.99[5] R☉ |
Surface gravity (log g) | 4.03[5] cgs |
Temperature | 4948[5] K |
Metallicity [Fe/H] | 0.55 ± 0.03[6] dex |
Rotational velocity (v sin i) | 2.54[5] km/s |
Age | 4.4 ± 2.2[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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The primary star is known to have two extrasolar planets orbiting around it.