Star in the constellation Capricornus
47 Capricorni Observation dataEpoch J2000 Equinox J2000 Constellation Capricornus Right ascension 21h 46m 16.26887s [ 2] Declination −09° 16′ 33.3799″[ 2] Apparent magnitude (V)6.00[ 3] (5.90 - 6.14) [ 4] Characteristics Evolutionary stage giant Spectral type M2III[ 5] B−Vcolor index ± 0.010[ 3] Variable type SRb [ 4] Astrometry Radial velocity (Rv )± 0.89[ 6] km/s Proper motion (μ)RA: +18.731 [ 2] mas /yr Dec.: +8.387 [ 2] mas /yr Parallax (π)2.7933± 0.2052 mas [ 2] Distance 1,170 ± 90 ly pc ) Absolute magnitude (MV )−1.76[ 3] Details Radius +11 [ 2] R ☉ Luminosity ± 162[ 2] L ☉ Temperature +188 [ 2] K Other designations c2 Cap 47 Cap AG Cap BD −09°5833HD 207005HIP 107487HR 8318SAO 145648[ 7] Database references SIMBAD data
47 Capricorni is avariable star located around 1,170[ 2] light years from the Sun in the southernconstellation Capricornus ,[ 7] Aquarius . It has thevariable star designation ofAG Capricorni and aBayer designation ofc2 Capricorni ;[ 8] 47 Capricorni is theFlamsteed designation naked eye as a dim, red-hued point of light with anapparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentricradial velocity of +20 km/s.[ 6]
In 1963,Alan William James Cousins announced that 47 Capricorni is a variable star.[ 9] [ 10]
This is an agingred giant star with astellar classification of M2III.[ 5] semiregular variable star of subtype SRb with a period of 30.592 days and a maximum brightness of 5.9 magnitude.[ 4] core exhausted, the star has expanded to around 102[ 2] Sun's radius . It is radiating 1,940[ 2] luminosity of the Sun from its swollenphotosphere at aneffective temperature of 3,784 K.[ 2]
^ "Hipparcos Tools Interactive Data Access" .Hipparcos . ESA. Retrieved8 December 2021 .^a b c d e f g h i j k l Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source atVizieR .^a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation",Astronomy Letters ,38 (5): 331,arXiv :1108.4971 Bibcode :2012AstL...38..331A ,doi :10.1134/S1063773712050015 ,S2CID 119257644 . ^a b c 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 .1 .Bibcode :2009yCat....102025S . ^a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars".Michigan Spectral Survey .5 .Bibcode :1999MSS...C05....0H . ^a b Famaey, B.; et al. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations".Astronomy and Astrophysics .498 (2): 627.arXiv :0901.0934 Bibcode :2009A&A...498..627F .doi :10.1051/0004-6361/200810698 .S2CID 18739721 . ^a b "47 Cap" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2014-05-12 .^ Kostjuk, N. D. (2002)."HD 207005" .HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index . Institute of Astronomy of Russian Academy of Sciences;CDS . IV/27A ^ Cousins, A. W. J. (1963)."Photometric Data for Stars in the Equatorial Zone (Third List)" .Monthly Notes of the Astron. Soc. Southern Africa .22 : 12.Bibcode :1963MNSSA..22...12C . Retrieved8 December 2024 . ^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973)."59th Name-List of Variable Stars" (PDF) .Information Bulletin on Variable Stars .834 .Bibcode :1973IBVS..834....1K . Retrieved8 December 2024 .
