V509 Cas
Excellent (62/100)
HIP 113561
VariableStar
Cas
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
5.00
Range
4.75 - 5.38
Period
175 days
Variable Type
Yellow Hypergiant
Spectral Type
G40
Star Color
Red
(B-V 1.42)
Distance
1,631 ly
Position & Identifiers
RA
23h 00m 05.1s
Dec
+56° 56' 43.0"
Constellation
Cas
HR
8752
HIP
113561
Variable ID
V509 Cas
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Visibility
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Light Curve
Comparison Stars for V509 Cas (4.8–5.5)
Nearby stable stars for estimating brightness (AAVSO)
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Size Comparison
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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 Fusion
Stellar Notes
SRd 4.75 - 5.50V. Spectrum variable. Variable NII emission. Probable nonradial pulsations coupled with mass loss. | Phase between V and B-V curves changed between 1980 and 1985, from half phase out of cycle to in phase. Cycles on | time scale of about a year. Bimodal radial pulsation inferred (Sheffer and Lambert 1987, PASP, 99, 1277) from analysis | of a decade of spectroscopic observations. As opposed to remarks on spectral type, the star appears to be getting | bluer (IBVS 3170), implying an increase in temperature of 800 K over the past decade.
Cep OB1.
Formerly classified G0Ia, but is intrinsically considerably brighter. Also classified F8e-KIa + BIV. According to | Morgan and Keenan (1973, ARA&A, 11, 29) spectrum has varied slowly from G0 0 to G5 0 over the last 20 years.
Survey Image
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