Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 21h 33m 58.85298s[1] |
Declination | 45° 35′ 30.6179″[1] |
Apparent magnitude (V) | 4.02 [2] |
Characteristics | |
Spectral type | G8 III Fe-0.5[3] |
U−B color index | +0.56[2] |
B−V color index | +0.89[2] |
Astrometry | |
Radial velocity (Rv) | +6.88[4] km/s |
Proper motion (μ) | RA: −23.79[1] mas/yr Dec.: −93.70[1] mas/yr |
Parallax (π) | 26.39 ± 0.15 mas[1] |
Distance | 123.6 ± 0.7 ly (37.9 ± 0.2 pc) |
Absolute magnitude (MV) | 1.11[5] |
Details | |
Mass | 2.16[6] M☉ |
Radius | 7.81[6] R☉ |
Luminosity | 37.1[6] L☉ |
Temperature | 5,100[6] K |
Metallicity [Fe/H] | −0.05[7] dex |
Rotational velocity (v sin i) | 0.71[7] km/s |
Age | 660[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Rho Cygni, Latinized from ρ Cygni, is a yellow-hued star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent magnitude of 4.02.[2] The measured annual parallax shift is 26.39 milliarcseconds,[1] which yields a distance estimate of 124 light years. It is moving further from the Sun with a radial velocity of +6.88.[4] The star is a member of the thin disk population of the Milky Way galaxy.[7]
This is an evolved giant star of type G with an estimated age of 660[7] million years and a stellar classification of G8 III Fe-0.5.[3] The suffix notation indicates the spectrum shows a mild underabundance of iron in the outer atmosphere. It has about 2.16 times the mass of the Sun and 7.81 times the Sun's girth.[6] The star is radiating 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,100 K.[6]
Rho Cygni is a bright X-ray source with a luminosity of 10.26×1029 ergs s−1.[8] It has a maximum magnetic field strength of 7.3±0.5 G[9] at the surface.