Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
A | |
Right ascension | 20h 45m 39.75304s[1] |
Declination | +30° 43′ 10.9756″[1] |
Apparent magnitude (V) | 4.22[2] |
B | |
Right ascension | 20h 45m 40.206s[3] |
Declination | +30° 43′ 12.96″[3] |
Apparent magnitude (V) | 11.06[3] |
Characteristics | |
Spectral type | G9.5III[4] |
U−B color index | +0.88[2] |
B−V color index | +1.05[2] |
Astrometry | |
Radial velocity (Rv) | –0.72[5] km/s |
Proper motion (μ) | RA: –8.98[1] mas/yr Dec.: +24.11[1] mas/yr |
Parallax (π) | 16.22 ± 0.19 mas[1] |
Distance | 201 ± 2 ly (61.7 ± 0.7 pc) |
Details | |
Mass | 2.07[6] M☉ |
Radius | 13.81[6] R☉ |
Luminosity | 89[7] L☉ |
Surface gravity (log g) | 2.5[7] cgs |
Temperature | 4,677[7] K |
Metallicity [Fe/H] | −0.24[7] dex |
Rotational velocity (v sin i) | 3.7[7] km/s |
Age | 2.27[6] Gyr |
Other designations | |
A: HR 7942, HD 197912, HIP 102453, SAO 70467 | |
B: TYC 2687-2652-1 | |
Database references | |
SIMBAD | A |
B |
52 Cygni is a giant star in the northern constellation of Cygnus with an apparent magnitude of 4.22. Based on its Hipparcos parallax, it is about 291 light-years (89 pc) away.
52 Cygni is a probable horizontal branch (red clump) star, fusing helium in its core, although there is a 25% chance that it is still on the red giant branch (RGB) and fusing hydrogen in a shell around an insert core. As a clump giant it would be 2.27 billion years old, but only 910 million years if 52 Cygni is an RGB star.[6] It shines with a bolometric luminosity of about 90 L☉ at an effective temperature of 4,677 K.[7] It has a radius of about 14 R☉.[6]
At an angular separation of 6.0″ from 52 Cygni is a faint magnitude 9.5 companion.[4]