Rho Cas
HIP 117863; Rho Cas; 7 Cas
Star
Cas
Visible
Level 2
Small telescope (4")
Physical Properties
Magnitude
4.54
Range
4.1 - 6.2
Variable Type
Yellow Hypergiant
Spectral Type
G20e
Star Color
Red
(B-V 1.22)
Distance
141.8 ly
Position & Identifiers
RA
23h 54m 23.0s
Dec
+57° 29' 58.0"
Constellation
Cas
HR
9045
HIP
117863
Bayer
Rho
Flamsteed
7 Cas
Variable ID
Rho Cas
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
SRd 4.1 - 6.2v, periods about 110 and 1100d (1946 minimum lasted 320d). Rapid spectral variation from cF5 to M5p. | Photoelectric observations since June 1986 indicate an amp. of only about 0.8V and 0.3(B-V).
Possibly wide CPM pair with HR 9052.
Cas OB5, within 51' of center of cluster NGC 7789, nonmember.
Also classified F8Ia-K0pIa-0.
Envelope has expansion velocity about 40k/s.
Survey Image
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