17 Com
Observable Double Star
Sep: 146.4", Companion: mag 6.6
Observable Variable Star
Good (54/100)
Range: 5.23 - 5.4, Period: 5.1d, Type: ACV+DSCT
HIP 60904; 17 Com
VariableStar
Com
Visible
Level 1
Naked eye / Binoculars - Requires steady seeing
Physical Properties
Magnitude
5.29
Range
5.23 - 5.4
Period
5.063 days
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
A1IVp
Star Color
Blue-white
(B-V -0.05)
Distance
155.3 ly
Position & Identifiers
RA
12h 28m 54.7s
Dec
+25° 54' 46.0"
Constellation
Com
HR
4752
HIP
60904
Flamsteed
17 Com
Variable ID
AI Com
Double Cat
8568
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Visibility
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Light Curve
Comparison Stars for 17 Com (5.2–5.4)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
3
Component IDs
AB
Separation
146.4″
Companion Mag
6.6
Position Angle
251°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
STFA 21
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 146.4″ · PA: 251° · N up, E left
Resolved · 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
Alpha CV + Delta Sct 5.23 - 5.40V, 5.0633 or 5.0754d and possible pulsation 0.052d. Var. magnetic field UII varies with | period 71 min.
CPM with HR 4751.
Mel 111 #146 (Coma).
CrEuSr star.
78 Vir type. Var. about 71 min.
Radius relative to Sun = 2.0.
Survey Image
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