HD 177809
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Lyra |
| Right ascension | 19h 4m 58.2868s |
| Declination | +30° 44' 00.224" |
| Apparent magnitude (V) | 6.096 |
| Characteristics | |
| Spectral type | M2III |
| B−V color index | +1.549 |
| Astrometry | |
| Radial velocity (Rv) | -16 km/s |
| Proper motion (μ) | RA: 21.82 mas/yr Dec.: -21.53 mas/yr |
| Parallax (π) | 4.39 ± 0.60 mas |
| Distance | approx. 700 ly (approx. 230 pc) |
| Other designations | |
HD 177809 is a 6th magnitude star in the constellation Lyra, approximately 700 light years away from Earth. It is a red giant star of the spectral type M2III, meaning it possesses a surface temperature of under 3,500 kelvins. In comparison to our Sun, it is much larger and brighter, but its surface is cooler.[1]
[edit] References
- ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+177809&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Retrieved October 17, 2007.
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