Rho Cygni

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. The measured annual parallax shift is 26.39 milliarcseconds, which yields a distance estimate of 124 light years. It is moving further from the Sun with a radial velocity of +6.88. The star is a member of the thin disk population of the Milky Way galaxy.

ρ Cygni
Location of ρ Cygni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 21h 33m 58.85298s
Declination 45° 35 30.6179
Apparent magnitude (V) 4.02
Characteristics
Spectral type G8 III Fe-0.5
U−B color index +0.56
B−V color index +0.89
Astrometry
Radial velocity (Rv)+6.88 km/s
Proper motion (μ) RA: −23.79 mas/yr
Dec.: −93.70 mas/yr
Parallax (π)26.39 ± 0.15 mas
Distance123.6 ± 0.7 ly
(37.9 ± 0.2 pc)
Absolute magnitude (MV)1.11
Details
Mass2.16 M
Radius7.81 R
Luminosity37.1 L
Temperature5,100 K
Metallicity [Fe/H]−0.05 dex
Rotational velocity (v sin i)0.71 km/s
Age660 Myr
Other designations
ρ Cyg, 73 Cygni, BD+44° 3865, FK5 1568, GC 30207, HD 205435, HIP 106481, HR 8252, SAO 51035
Database references
SIMBADdata

This is an evolved giant star of type G with an estimated age of 660 million years and a stellar classification of G8 III Fe-0.5. 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. The star is radiating 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,100 K.

Rho Cygni is a bright X-ray source with a luminosity of 10.26×1029 ergs s−1. It has a maximum magnetic field strength of 7.3±0.5 G at the surface.

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