Zeta Her
Observable Double Star
Fair (30/100)
Sep: 1.6", Companion: mag 5.4
HIP 81693; Zeta Her; 40 Her
DoubleStar
Her
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
2.81
Spectral Type
G2IV
Star Color
Yellow
(B-V 0.65)
Distance
35.0 ly
Position & Identifiers
RA
16h 41m 17.2s
Dec
+31° 36' 11.0"
Constellation
Her
HR
6212
HIP
81693
Bayer
Zeta
Flamsteed
40 Her
Double Cat
10157
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Visibility
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Multiple Star System
Separation
1.6″
Companion Mag
5.4
Position Angle
110°
Star Colors
A: Yellow
B: Orange
Discoverer
STF2084
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.6″ · PA: 110° · 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
ADS 10157A is var. suspect NSV 7915.
ADS 10157AB, 2.90 F9IV, 5.53 G7V, 34.49y, a = 1.355". ADS 10157A*, 10.5y, a = 0.08".
ADS 10157A, 34.417y D, K 3.8k/s, V0 -69.9k/s, asini 590. Resolved by speckle interferometry.
Zeta Her group.
0.096".
Survey Image
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