Diadem
HIP 64241; Alpha Com; 42 Com
HIP 64241; Alpha Com; 42 Com
DoubleStar
Com
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
5.22
Spectral Type
F5V
Star Color
Yellow
(B-V 0.45)
Distance
60.4 ly
Position & Identifiers
RA
13h 09m 59.3s
Dec
+17° 31' 46.0"
Constellation
Com
HR
4968
HIP
64241
Bayer
Alpha
Flamsteed
42 Com
Double Cat
8804
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
0.4″
Companion Mag
5.5
Companion Sp
F6V
Position Angle
192°
Star Colors
A: Yellow
B: Yellow
Discoverer
STF1728
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.4″ · PA: 192° · 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
Var. of combined light with HR 4969 not confirmed, but 90d inclination of orbit indicates eclipses possible.
AB 5.05 F5V, 5.08 F5V, 25.87y, a = 0.662". Colors, spectrum for combined light. Mag. of blended HR 4968, 4969 is | 4.32V. ADS 8804A speckle interferometric sep. 0.43" 1978.40, 0.58" 1981.47.
Spectrum blended with HR 4969.
0.058".
Probably blended with HR 4969.
Diadem.
Survey Image
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