| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h39m 23.1274s[1] |
| Declination | +45° 40′ 00.9405″[1] |
| Apparent magnitude (V) | 6.61±0.01[2] |
| Characteristics | |
| Spectral type | B5 IV[3] |
| U−B color index | -0.59[4][2] |
| B−V color index | −0.07[2] |
| Astrometry | |
| Radial velocity (Rv) | −15±2[5] km/s |
| Proper motion (μ) | RA: +3.737 mas/yr[1] Dec.: −1.586 mas/yr[1] |
| Parallax (π) | 2.4923 ± 0.0284 mas[1] |
| Distance | 1,310 ± 10 ly (401 ± 5 pc) |
| Absolute magnitude (MV) | −1.15[6] |
| Details | |
| Mass | 4.21[7] M☉ |
| Radius | 5.17[8] R☉ |
| Luminosity | 379[6] L☉ |
| Surface gravity (log g) | 3.52[7] cgs |
| Temperature | 13,399[9] K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotational velocity (v sin i) | 135[10] km/s |
| Other designations | |
BD+45°3233, GC 28793, HD 197036, HIP 101934, HR 7912, SAO 49898, GSC 03574-03107 | |
| Database references | |
| SIMBAD | data |
HD 197036 is a single star in the northern constellation Cygnus. It has an absolute magnitude of −1.15[6] and an apparent magnitude of 6.61,[2] below the max naked eye visibility. Located 1,310 light years away, it is approaching Earth with a heliocentric radial velocityof−15 km/s.[5]
HD 197036 is a bluish white subgiant star of the spectral type B5IV, and has an angular diameterof0.12 mas.[11] This yields a radius of 5.17 R☉[8] at its estimated distance. At present it has 4.21 times the mass of the Sun[7] and shines at 379 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 13,399 K,[9] giving it a bluish white hue. Like many hot stars, it spins rapidly with a projected rotational velocity of 135 km/s−1[10] and has a near solar metallicity.[7]
