HD 193472
Am star in the constellation Delphinus
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HD 193472 (HR 7774) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.94,[3] making it visible with the naked eye if viewed under ideal conditions. Parallax measurements put it at a distance of 282 light years[2] and has a radial velocity of −8 km/s,[7] indicating that the object drifting towards the Solar System.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus[1] |
| Right ascension | 20h 20m 00.1887s[2] |
| Declination | +13° 32′ 53.118″[2] |
| Apparent magnitude (V) | 5.94±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | kA4hF0mF[4][5] |
| U−B color index | +0.12[6] |
| B−V color index | +0.28[6] |
| Astrometry | |
| Radial velocity (Rv) | −8.00±1.78[7] km/s |
| Proper motion (μ) | RA: −3.900 mas/yr[2] Dec.: −5.007 mas/yr[2] |
| Parallax (π) | 11.5644±0.0547 mas[2] |
| Distance | 282 ± 1 ly (86.5 ± 0.4 pc) |
| Absolute magnitude (MV) | +1.44[1] |
| Details | |
| Mass | 1.61±0.25[8] M☉ |
| Radius | 3.15±0.11[8] R☉ |
| Luminosity | 23.9±0.9[8] L☉ |
| Surface gravity (log g) | 3.65±0.08[8] cgs |
| Temperature | 7,188±114[8] K |
| Metallicity [Fe/H] | +0.43±0.20[9] dex |
| Rotational velocity (v sin i) | 105[10] km/s |
| Age | 1.02+0.18 −0.16[11] Gyr |
| Other designations | |
| AG+13°2095, BD+13°4360, GC 28275, HD 193472, HIP 100256, HR 7774, SAO 105974 | |
| Database references | |
| SIMBAD | data |
HD 193472 has a stellar classification of kA4hF0mF, indicating that its an Am star with the calcium K-line of an A4 star, the hydrogen lines and effective temperature of a F0 star, and the metallic lines of a F2 star. Due to a radius over three times that of the Sun and a relatively low surface gravity, it appears to be slightly evolved. HD 193472 has 161% the mass of the Sun and shines at 24 times the luminosity of the Sun[12] from its photosphere at an effective temperature of 7,188 K, giving it a yellowish white glow. HD 193472 has a projected rotational velocity of 105 km/s.[10]