HD 194953
High proper motion star
From Wikipedia, the free encyclopedia
HD 194953 (HR 7824) is a solitary star in the equatorial constellation Delphinus. It is faintly visible to the naked eye with an apparent magnitude of 6.19[3] and is located 414 light years away.[2] However, it is approaching the Solar System with a heliocentric radial velocity of −28 km/s.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus[1] |
| Right ascension | 20h 28m 16.7824s[2] |
| Declination | +02° 56′ 14.030″[2] |
| Apparent magnitude (V) | 6.19±0.01[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | G8 III/IV[4] |
| U−B color index | +0.56[5] |
| B−V color index | +0.90[5] |
| Astrometry | |
| Radial velocity (Rv) | −28±0.4[6] km/s |
| Proper motion (μ) | RA: +50.801 mas/yr[2] Dec.: −5.249 mas/yr[2] |
| Parallax (π) | 7.8706±0.1437 mas[2] |
| Distance | 414 ± 8 ly (127 ± 2 pc) |
| Absolute magnitude (MV) | +0.74[1] |
| Details | |
| Mass | 2.38[7] M☉ |
| Radius | 10.22[8] R☉ |
| Luminosity | 53.7[9] L☉ |
| Surface gravity (log g) | 2.88[10] cgs |
| Temperature | 5,101±122[8] K |
| Metallicity [Fe/H] | −0.11[10] dex |
| Rotational velocity (v sin i) | 2.4±1.2[11] km/s |
| Age | 640[7] Myr |
| Other designations | |
| 6 G. Delphini, AG+02°2586, BD+02°4175, GC 28470, HD 194953, HIP 100969, HR 7824, SAO 125843[12][13] | |
| Database references | |
| SIMBAD | data |
HD 194953 has a stellar classification of G8 III/IV[4] — a blended luminosity class of a subgiant and giant. It has 2.38 times the mass of the Sun[7] and an enlarged radius of 10.2 R☉[8] at an age of 640 million years.[7] It radiates at 54 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 5,101 K,[8] giving a yellow hue. HD 194953 is slightly metal deficient with an iron abundance 78% that of the Sun[10] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[11]