2 Centauri

2 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 49m 26.72s[1]
Declination −34° 27′ 02.8″[1]
Apparent magnitude (V) 4.16 - 4.26[2]
Characteristics
Spectral type M5III[3]
U−B color index +1.44[4]
B−V color index +1.49[4]
Variable type SRb[2]
Astrometry
Radial velocity (Rv)+40.7 ± 0.7[5] km/s
Proper motion (μ) RA: -41.68 ± 0.23[1] mas/yr
Dec.: -59.77 ± 0.18[1] mas/yr
Parallax (π)17.82 ± 0.21[1] mas
Distance183 ± 2 ly
(56.1 ± 0.7 pc)
Absolute magnitude (MV)+0.51[6]
Other designations
g Centauri, V806 Centauri, HR 5192, HD 120323, CD−33° 9358, HIP 67457, SAO 204875, GC 18666
Database references
SIMBADdata

2 Centauri is a star in the constellation Centaurus.

2 Centauri is an M-type red giant with a mean apparent magnitude of +4.19. It is approximately 183 light years from Earth. It is classified as a semiregular variable star and its brightness varies from magnitude +4.16 to +4.26 with a period of 12. days.

References

  1. 1 2 3 4 5 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. Vizier catalog entry
  2. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. ↑ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440.


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