Omega Cyg
HIP 101138; Omega1 Cyg; 45 Cyg
HIP 101138; Omega1 Cyg; 45 Cyg
DoubleStar
Cyg
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.95
Spectral Type
B2.5IV
Star Color
Blue-white
(B-V -0.09)
Position & Identifiers
RA
20h 30m 03.5s
Dec
+48° 57' 06.0"
Constellation
Cyg
HR
7844
HIP
101138
Bayer
Omega1
Flamsteed
45 Cyg
Double Cat
13932
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Visibility
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Multiple Star System
Components
3
Component IDs
AC
Separation
15.0″
Companion Mag
12.9
Position Angle
336°
Star Colors
A: Blue-white
Discoverer
BU 669
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 15.0″ · PA: 336° · 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
Component B, 12.9v A5V at 18", optical.
In reflection nebula.
See HR 7828. In the older literature HR 7844 often confused with HR 7851 (q.v.) because the magnitudes and separations | of the two brighter components of each, 7844AB, 7851AC, are nearly the same, although the position angles differ. In | Allen under the star named Ruchba the P.A. corresponds to HR 7844 while the color clearly refers to HR 7851.
Survey Image
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