Eta Sgr
Excellent (61/100)
HIP 89642; Eta Sgr
DoubleStar
Sgr
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
3.11
Range
3.05 - 3.12
Variable Type
LB:
Spectral Type
M2 III
Star Color
Red
(B-V 1.56)
Distance
146 ly
Position & Identifiers
RA
18h 17m 37.6s
Dec
-36° 45' 42.0"
Constellation
Sgr
HR
6832
HIP
89642
Bayer
Eta
Variable ID
Eta Sgr
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Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
3.5″
Companion Mag
8.0
Position Angle
110°
Star Colors
A: Red
Discoverer
BU 760
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.5″ · PA: 110° · 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 Fusion
Stellar Notes
Lb 3.08 - 3.12V.
Ultraviolet FeII emission.
Survey Image
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