21 Hya
Observable Variable Star
Good (52/100)
Range: 6.11 - 6.58, Period: 7.7d, Type: EA/DM
HIP 45184; 21 Hya
VariableStar
Hya
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
6.11
Range
6.11 - 6.58
Period
7.750 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
Hya
HR
3655
HIP
45184
Flamsteed
21 Hya
Variable ID
KW Hya
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Visibility
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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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Multiple Star System
Separation
0.0″
Companion Mag
6.5
Position Angle
73°
Star Colors
A: Yellow-white
Discoverer
GAA 7
Eyepiece View
15x
Dawes: 1.9″
TFOV: 3.3°
Realistic = true angular size
Sep: 0.0″ · PA: 73° · N up, E left
Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
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 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?
Survey Image
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