Star in the constellation Cassiopeia
50 Cassiopeiae Location of 50 Cassiopeiae (circled in red)
Observation dataEpoch J2000 Equinox J2000 Constellation Cassiopeia [ 1] Right ascension 02h 03m 26.10206s [ 2] Declination +72° 25′ 16.6376″[ 2] Apparent magnitude (V)+3.95[ 1] Characteristics Evolutionary stage main sequence [ 3] Spectral type A2 V[ 3] B−Vcolor index ± 0.007[ 1] Astrometry Radial velocity (Rv )± 0.9[ 4] km/s Proper motion (μ)RA: −43.57[ 5] mas /yr Dec.: +22.30[ 5] mas /yr Parallax (π)20.76± 0.14 mas [ 5] Distance 157 ± 1 ly pc ) Absolute magnitude (MV )0.54[ 1] Details Mass ± 0.03[ 3] M ☉ Radius 2.5[ 6] R ☉ Luminosity +3.5 [ 3] L ☉ Temperature +240 [ 3] K Metallicity [Fe/H] ± 0.28[ 7] dex Rotational velocity (v sin i )91[ 3] Other designations Gang,50 Cas ,BD +71°117FK5 70GC 2445HD 12216HIP 9598HR 580SAO 4560NGC 771[ 8] Database references SIMBAD data
50 Cassiopeiae , also namedGang ,[ 9] star in the northernconstellation ofCassiopeia . In the past, it had been misidentified as a suspectednebula , and given the numberNGC 771 .[ 10] apparent visual magnitude of +3.95.[ 1] parallax shift ofmas light years away. It is moving closer, having a heliocentricradial velocity of −18 km/s,[ 4] [ 1]
50 Cassiopeiae in optical light Alight curve for 50 Cassiopeiae, plotted fromTESS [ 11] It is anA-type main-sequence star with astellar classification of A2 V.[ 3] [ 12] mass of the Sun ,[ 3] Sun's radius .[ 6] Sun's luminosity from itsphotosphere at aneffective temperature of around 9,376 K.[ 3]
The star was the brightest star in the occasionally used 1775 to 19th century constellationCustos Messium , typically drawn as a depiction ofCharles Messier standing on top of the giraffe (Camelopardalis ), betweenCepheus and Cassiopeia.[ 13]
InChinese astronomy , this star is part of the asterismGàng (槓 Huá Gài (華蓋 IAU Working Group on Star Names approved the name Gang for this star on 25 December 2025, and it is now so entered in the IAU Catalog of Star Names. The nameHuagai was adopted forι Cassiopeiae , andCustos (after Custos Messium) forBE Camelopardalis .[ 9]
^a b c d e f Anderson, E.; Francis, C (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 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 ^a b c d e f g h i Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities",Astronomy & Astrophysics ,537 : A120,arXiv :1201.2052 Bibcode :2012A&A...537A.120Z ,doi :10.1051/0004-6361/201117691 ,S2CID 55586789 . ^a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project",Astronomy & Astrophysics ,546 : 14,arXiv :1208.3048 Bibcode :2012A&A...546A..61D ,doi :10.1051/0004-6361/201219219 ,S2CID 59451347 , A61. ^a b c 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 18759600 . ^a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics",Astronomy and Astrophysics ,367 (2):521– 524,arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P ,doi :10.1051/0004-6361:20000451 ,S2CID 425754 . ^ Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass",The Astrophysical Journal ,826 (2): 14,arXiv :1604.07403 Bibcode :2016ApJ...826..171G ,doi :10.3847/0004-637X/826/2/171 S2CID 119241004 , 171. ^ "50 Cas" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2018-06-25 .^a b "IAU Catalog of Star Names" . Retrieved28 December 2025 .^ Wolfgang Steinicke (19 August 2010).Observing and Cataloguing Nebulae and Star Clusters: From Herschel to Dreyer's New General Catalogue ISBN 978-1-139-49010-8 ^ MAST: Barbara A. Mikulski Archive for Space Telescopes , retrieved8 December 2021 .^ Koen, Chris; Eyer, Laurent (2002)."New periodic variables from the Hipparcos epoch photometry" .Monthly Notices of the Royal Astronomical Society .331 (1):45– 59.arXiv :astro-ph/0112194 Bibcode :2002MNRAS.331...45K .doi :10.1046/j.1365-8711.2002.05150.x S2CID 10505995 . ^ Ian Ridpath's Star Tales - Custos Messium
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