Eta Cyg
HIP 98110; Eta Cyg; 21 Cyg
DoubleStar
Cyg
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
3.89
Spectral Type
K0III
Star Color
Orange
(B-V 1.02)
Distance
134.9 ly
Position & Identifiers
RA
19h 56m 18.4s
Dec
+35° 05' 00.0"
Constellation
Cyg
HR
7615
HIP
98110
Bayer
Eta
Flamsteed
21 Cyg
Double Cat
13149
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Visibility
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Multiple Star System
Components
5
Component IDs
AC
Separation
7.2″
Companion Mag
12.0
Position Angle
206°
Star Colors
A: Orange
Discoverer
BU 980
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 7.2″ · PA: 206° · 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
AB CPM. B, 12v at 7". Other components optical.
0.035".
Survey Image
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