52 Cygni

52 Cygni
Location of 52 Cygni (circled)
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]
Distance201 ± 2 ly
(61.7 ± 0.7 pc)
Details
Mass2.07[6] M☉
Radius13.81[6] R☉
Luminosity89[7] L☉
Surface gravity (log g)2.5[7] cgs
Temperature4,677[7] K
Metallicity [Fe/H]−0.24[7] dex
Rotational velocity (v sin i)3.7[7] km/s
Age2.27[6] Gyr
Other designations
ADS 14259, BD+30 4167, WDS J20456+3043, CCDM J20457+3043
A: HR 7942, HD 197912, HIP 102453, SAO 70467
B: TYC 2687-2652-1
Database references
SIMBADA
B
52 Cygni with NGC 6960, part of the Veil Nebula

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]

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  2. ^ a b c Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggleton was invoked but never defined (see the help page).
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  6. ^ a b c d e Cite error: The named reference reffert was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).