Gamma Sgr
HIP 88567; Gamma1 Sgr
Observable Variable Star
Excellent (62/100)
Range: 4.3 - 5.1, Period: 7.6d
HIP 88567; Gamma1 Sgr
VariableStar
Sgr
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
4.69
Spectral Type
F4-G1Ib
Star Color
Orange
(B-V 0.78)
Position & Identifiers
RA
18h 05m 01.3s
Dec
-29° 34' 48.0"
Constellation
Sgr
HR
6742
HIP
88567
Bayer
Gamma1
Variable ID
W Sgr
Double Cat
11029
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Visibility
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Comparison Stars for Gamma Sgr (4.3–5.1)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
4
Separation
34.0″
Companion Mag
13.5
Companion Sp
A0V
Position Angle
232°
Star Colors
A: Orange
B: Blue-white
Discoverer
SEE 346
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 34.0″ · PA: 232° · 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
ADS 11029A, CDelta 4.30 - 5.08V, 7.594710d. Period changes. Spectrum and magnetic field variable. One component of | SB.
ADS 11029A is speckle interferometric double, sep. 0.116". Visual companions, 13.5v at 33" and 13.5v at 48".
80y, K 2.65k/s, V0 -27.7k/s, asini 60.
Although HR 6742 and 6746 are named gamma1 and gamma2 Sgr, respectively, more often 6746 is simply called gamma Sgr | and the Greek letter is omitted for HR 6742.
Survey Image
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