  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 29m 23.73561s[1] |
| Declination | +30° 22′ 06.7968″[1] |
| Apparent magnitude (V) | 4.02[2] |
| Characteristics | |
| Evolutionary stage | supergiant[3] |
| Spectral type | F5Ib-II[3] |
| B−Vcolor index | +0.38[2] |
| Variable type | constant[3] |
| Astrometry | |
| Radial velocity (Rv) | −18.20[4] km/s |
| Proper motion (μ) | RA: 6.89[1]mas/yr Dec.: −0.87[1]mas/yr |
| Parallax (π) | 4.24±0.16 mas[1] |
| Distance | 770 ± 30 ly (236 ± 9 pc) |
| Absolute magnitude (MV) | −3.32[5] |
| Details | |
| Mass | 5.3±0.4[6] M☉ |
| Radius | 27.01+2.51 −1.01[7] R☉ |
| Luminosity | 1,197±90[7] L☉ |
| Surface gravity (log g) | 2.32±0.08[6] cgs |
| Temperature | 6533+126 −283[7] K |
| Metallicity[Fe/H] | 0.00±0.07[6] dex |
| Rotational velocity (v sin i) | 9.5±2.0[3] km/s |
| Age | 85[6] Myr |
| Other designations | |
| 41 Cyg,BD+29°4057,HD 195295,HIP 101076,HR 7834,SAO 70095[8] | |
| Database references | |
| SIMBAD | data |
41 Cygni is a single[9]star in the northernconstellation ofCygnus, located near the southern border withVulpecula. It is visible to the naked eye as a faint, yellow-white hued star with anapparent visual magnitude of 4.02.[2] The star lies at a distance of around 770 light years from the Sun, based onparallax, and is drifting closer with aradial velocity of −18 km/s.[4]
This is a sharp-linedsupergiant star[10] with astellar classification of F5Ib-II.[3] It is 85[6] million years old with 5.3[6] times themass of the Sun and is spinning with aprojected rotational velocity of 9.5 km/s.[3] Having exhausted the supply of hydrogen at itscore, the star has expanded to 27[7] times theSun's radius. It is radiating about 1,200[7] times theSun's luminosity from its swollenphotosphere at aneffective temperature of 6,533 K.[7]
It is the brightest star in Cygnus without aBayer designation. It was once designatedi Cygni byJohn Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.[11]