U Sgr
Excellent (62/100)
HIP 90836
VariableStar
Sgr
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
6.68
Range
6.28 - 7.15
Period
6.7 days
Variable Type
Classical Cepheid
Spectral Type
G1.5Ib
Star Color
Orange
(B-V 1.13)
Position & Identifiers
RA
18h 31m 53.3s
Dec
-19° 07' 30.0"
Constellation
Sgr
HR
6947
HIP
90836
Variable ID
U Sgr
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Visibility
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Light Curve
Comparison Stars for U Sgr (6.3–7.1)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System U,V,W: optical
Components
17
Component IDs
AG
Separation
66.2″
Companion Mag
9.1
Companion Sp
A0
Position Angle
252°
Star Colors
A: Orange
B: Blue-white
Discoverer
BU 966
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 66.2″ · PA: 252° · 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
CDelta 6.34 - 7.08V, 6.744925d. May have blue companion.
M25; in cluster IC 4725 #103.
Survey Image
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