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Gamma Cassiopeiae

Gamma Cassiopeiae, Latinized from γ Cassiopeiae formally named Tiansi, is a multiple star system at the center of the distinctive "W" asterism in the northern circumpolar constellation of Cassiopeia. It was observed in 1866 by Angelo Secchi, the first star ever observed with emission lines. It is now considered a Be star.

Physical properties, Names & Companions

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Apparent magnitude (V)
2.39 (varies by±0.01)
B−V color index
−0.15
Constellation
Cassiopeia
Declination
+60° 43′ 00.2984″
Evolutionary stage
main sequence
Right ascension
00h 56m 42.50108s

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Physical properties

Companions

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Gamma Cassiopeiae

Nodes59
Edges58
Triples92
Avg. degree1.97
Density0.033898
Components1

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Gamma Cassiopeiae

Top relations

related to Names · 25
Gamma Cassiopeiae → Although, Arabic, Bayer, Cas, Cassiopeiae, Cassiopeiae Aa, Chinese, Cè, Flamsteed, Gamma, Gamma Cas, Heavenly Quadriga, IAU Catalog, Latin, Latinized, November, Star Names, The, The Chinese, The IAU Working Group
related to Companions · 14
Gamma Cassiopeiae → Additionally, An, Component, Earth, Finally, Gaia Data Release, HD, Hipparcos, HR, It, Star, Sun, The, This
related to Physical properties · 13
Gamma Cassiopeiae → Alpha Cassiopeiae, At, Beta Cassiopeiae, Caph, Cassiopeiae, In, It, November, Observations, Schedar, TESS, The, When
related to External links · 11
Gamma Cassiopeiae → Active Stars ResearchGamma Cassiopeiae, Astronomy Picture, Be Stars, Day, December, Friends, Gamma Cas, Hot, New Class, Philippe Stee's, X-ray Star
related to X-ray emission · 9
Gamma Cassiopeiae → Be, Historically, In, It, Observations, The, X-ray, X-rays, XRISM
see also · 7
Gamma Cassiopeiae → ChaffeeSh, Dnoces, Ed WhiteGamma Velorum, II, Iota Ursae Majoris, Regor, Roger
is a · 2
Gamma Cassiopeiae → rapidly spinning star with a projected rotational velocity of 389 km/s, variable star system
Apparent magnitude (V) · 1
Gamma Cassiopeiae → 2.39 (varies by±0.01)
B−V color index · 1
Gamma Cassiopeiae → −0.15
Constellation · 1
Gamma Cassiopeiae → Cassiopeia

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Important terminology

star cassiopeiae gamma disk stars system x-ray magnitude name emission variable hot magnetic white lines mass hd primary surface tiansi

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Gamma CassiopeiaeApparent magnitude (V)2.39 (varies by±0.01)1.00infobox
Gamma CassiopeiaeB−V color index−0.151.00infobox
Gamma CassiopeiaeConstellationCassiopeia1.00infobox
Gamma CassiopeiaeDeclination+60° 43′ 00.2984″1.00infobox
Gamma CassiopeiaeEvolutionary stagemain sequence1.00infobox
Gamma CassiopeiaeRight ascension00h 56m 42.50108s1.00infobox
Gamma CassiopeiaeSpectral typeB0.5IVe1.00infobox
Gamma CassiopeiaeU−B color index−1.081.00infobox
Gamma CassiopeiaeVariable typeγ Cas1.00infobox
Gamma Cassiopeiaeis avariable star system0.90text
Gamma Cassiopeiaeis arapidly spinning star with a projected rotational velocity of 389 km/s0.90text
a white dwarf or neutron star.Observations are incompatible with the wind-disk collisioninstance ofor from accretion onto the surface of a degenerate companion0.80text

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