HD 193373
Star in the constellation of Delphinus
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HD 193373 (HR 7771) is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21,[3] placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant[2] and it is currently receding with a heliocentric radial velocity of 22.7 km/s.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus[1] |
| Right ascension | 20h 19m 29.2960s[2] |
| Declination | +13° 13′ 00.357″[2] |
| Apparent magnitude (V) | 6.21[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M1 III[5] |
| B−V color index | +1.63[3] |
| Astrometry | |
| Radial velocity (Rv) | 22.68±0.13[6] km/s |
| Proper motion (μ) | RA: −15.865 mas/yr[2] Dec.: −18.581 mas/yr[2] |
| Parallax (π) | 3.8556±0.0442 mas[2] |
| Distance | 846 ± 10 ly (259 ± 3 pc) |
| Absolute magnitude (MV) | −0.46[1] |
| 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 |
This is an asymptotic giant branch star[4] with a stellar classification of M1 III.[5] 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 temperature of 3,884 K,[8] giving a red hue. HD 193373 has an iron abundance 120% that of the Sun, making it slightly metal enriched.[10]