21 Hya
Good (56/100)
HIP 45184; 21 Hya
VariableStar
Hydra
(Hya)
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
6.11
Range
6.11 - 6.58
Period
7.7 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
A3III:m+A0V:
Star Color
Yellow-white
(B-V 0.22)
Position & Identifiers
RA
09h 12m 26.0s
Dec
-07° 06' 35.0"
Constellation
Hydra
(Hya)
HR
3655
HIP
45184
Flamsteed
21 Hya
Variable ID
KW Hya
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Light Curve
Comparison Stars for 21 Hya (6.1–6.6)
Nearby stable stars for estimating brightness (AAVSO)
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
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Stellar Fusion
Stellar Notes
EA 6.11 - 6.58V, 7.750d. Misnamed KM Hya in the 64th Name List of Variable Stars (IBVS 1581) and propagated in | IBVS 2015, the KM designation having previously been asigned to a faint star. HR 3655 has now been corrected to | KW Hya (IBVS 2681).
7.7504d, K 73.2k/s, V0 -4k/s, msin3i 1.59, asini 7.75. Primary, giant; secondary dA0?
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