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]

References

  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600Vizier catalog entry
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  3. ^ a b c Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  4. ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  5. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
  6. ^ a b c d e Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. S2CID 59334290.
  7. ^ a b c d e f Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397

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