Eta Aql
Observable Variable Star
Excellent (67/100)
Range: 3.49 - 4.3, Period: 7.2d, Type: DCEP
HIP 97804; Eta Aql; 55 Aql
VariableStar
Aql
Visible
Level 1
Naked eye / Binoculars - Monitor brightness changes
Physical Properties
Magnitude
3.90
Range
3.49 - 4.3
Period
7.177 days
Variable Type
Classical Cepheid
Spectral Type
F7-G2Ib
Star Color
Orange
(B-V 0.89)
Distance
1382.0 ly
Position & Identifiers
RA
19h 52m 28.4s
Dec
+01° 00' 20.0"
Constellation
Aql
HR
7570
HIP
97804
Bayer
Eta
Flamsteed
55 Aql
Variable ID
Eta Aql
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Visibility
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Light Curve
Comparison Stars for Eta Aql (3.5–4.3)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
0.6″
Companion Mag
10.0
Companion Sp
F3V
Position Angle
91°
Star Colors
A: Orange
B: Yellow-white
Discoverer
EVS 2
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.6″ · PA: 91° · 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
Discovered by Pigott in 1784. CDelta 3.50 - 4.30V, 7.176641d. Period changes. Variable He 10830 in emission and | absorption.
Also classified F6Ib-G4Ib. UV suggests A0V companion.
Survey Image
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