Diadem — Star in Coma Berenices
HIP 64241; Alpha Comae Berenices; 42 Comae Berenices
Observe
1Physical Properties
Magnitude
5.22
Spectral Type
F5V
Star Color
Yellow
(B-V 0.45)
Distance
60 ly
2Position & Identifiers
RA
13h 09m 59.3s
Dec
+17° 31' 46.0"
Constellation
Coma Berenices
(Com)
HR
4968
HIP
64241
HD
114378
Bayer
Alpha
Flamsteed
42 Com
Double Cat
8804
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3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium | Hard+ | Hard |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
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Best season
Mar – May
(peak: Apr)
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5
Size Comparison
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6
Compare Stars
7
Spectral Classification
8
Hertzsprung-Russell Diagram
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9
Stellar Lifecycle
10
Blackbody Spectrum
11
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
12
Stellar Fusion
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13Stellar 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.
14
Light Travel Time Machine
15
Relativistic Travel
Survey Image
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Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
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