| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h19m 29.2960s[1] |
| Declination | +13° 13′ 00.3571″[1] |
| Apparent magnitude (V) | 6.21[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1 III[4] |
| B−V color index | +1.63[2] |
| Astrometry | |
| Radial velocity (Rv) | 22.68±0.13[5] km/s |
| Proper motion (μ) | RA: −15.865 mas/yr[1] Dec.: −18.581 mas/yr[1] |
| Parallax (π) | 3.8556 ± 0.0442 mas[1] |
| Distance | 846 ± 10 ly (259 ± 3 pc) |
| Absolute magnitude (MV) | −0.46[6] |
| Details | |
| Mass | 1.77[7] M☉ |
| Radius | 57.5[8] R☉ |
| Luminosity | 592±16[9] L☉ |
| Surface gravity (log g) | 0.89[10] cgs |
| Temperature | 3,884±122[8] K |
| Metallicity [Fe/H] | +0.08[10] dex |
| Other designations | |
AG+13°2092, BD+12°4289, HD 193373, HIP 100208, HR 7771, SAO 105961[11] | |
| Database references | |
| SIMBAD | data |
HD 193373 (HR 7771) is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21,[2] placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant[1] and it is currently receding with a heliocentric radial velocityof22.7 km/s.[5]
This is an asymptotic giant branch star[3] with a stellar classification of M1 III.[4] In its current state, the object is fusing hydrogen and helium shells around an inert carbon core. HR 7771 has 177% the mass of the Sun[7] but has expanded to an enlarged radius of 57.5 R☉.[8] It radiates at 592 times the luminosity of the Sun[9] from its photosphere at an effective temperatureof3,884 K,[8] giving a red hue. HD 193373 has an iron abundance 120% that of the Sun, making it slightly metal enriched.[10]
