HD 177809
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.07[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M3- IIIab[1] |
| B−V Template:Engvar | +1.575[1] |
| Astrometry | |
| Radial velocity (Rv) | −19.35[4] km/s |
| Proper motion (μ) | RA: +31.265[2] mas/yr Dec.: −25.486[2] mas/yr |
| Parallax (π) | 4.9114±0.0698 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.39[1] |
| Details | |
| Mass | 1.3[5] Template:Solar mass |
| Radius | 50[6] Template:Solar radius |
| Luminosity | 477[6] Template:Solar luminosity |
| Surface gravity (log g) | 1.81[5] cgs |
| Temperature | 3,798[6] K |
| Metallicity [Fe/H] | −0.22[5] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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HD 177809 is a 6th magnitude star in the constellation Lyra, approximately 664 light years away from Earth. It is a red giant star of the spectral type M3- IIIab<, meaning it possesses a surface temperature of under Script error: No such module "val".. In comparison to the Sun, it is much larger and brighter, but its surface is cooler.
References
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