U Oph
Observable Variable Star
Excellent (71/100)
Range: 5.8 - 6.6, Period: 1.7d, Type: EA
HIP 84500
VariableStar
Oph
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
5.88
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B5Vnn+B5V
Star Color
White
(B-V 0.06)
Distance
1630.8 ly
Position & Identifiers
RA
17h 16m 31.7s
Dec
+01° 12' 38.0"
Constellation
Oph
HR
6414
HIP
84500
Variable ID
U Oph
Double Cat
10428
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Visibility
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Comparison Stars for U Oph (5.8–6.6)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
20.7″
Companion Mag
13.0
Companion Sp
B5V
Position Angle
357°
Star Colors
A: White
B: Blue
Discoverer
HJ 854
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 20.7″ · PA: 357° · 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 10428A, EA 5.84 - 6.56V, 1.67734617d. Period changes. i 86.57d. Components 5.3 and 4.6 Suns.
B is dG0, optical.
ADS 10428A, B2, A0-2, 1.6773d, K 180.0k/s, V0 -10.8k/s, msin3i 5.00, asini 4.15. vsini secondary 92k/s.
Survey Image
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