Theta Oph
HIP 84970; Theta Oph; 42 Oph
DoubleStar
Oph
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
3.27
Range
3.26 - 3.29
Period
3.4 hours
Variable Type
Beta Cephei (Pulsating)
Spectral Type
B2 IV
Star Color
Blue
(B-V -0.22)
Distance
436 ly
Position & Identifiers
RA
17h 22m 00.6s
Dec
-24° 59' 58.0"
Constellation
Oph
HR
6453
HIP
84970
Bayer
Theta
Flamsteed
42 Oph
Variable ID
The Oph
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Visibility
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Light Curve
Multiple Star System
Separation
0.2″
Companion Mag
6.2
Position Angle
55°
Star Colors
A: Blue
B: White
Discoverer
CHR 182
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
Beta C 3.25 - 3.31V, multi-periodic 0.140531 and others ranging from 0.0464 to 0.1399d.
3.6, 5.6v, sep. 0.00003", 11.44d. K 5.25k/s, V0 -1.5k/s. Also 0.29d.
Sco OB2; Sco-Cen cluster; Sco-Cen assoc.; upper Sco.
Survey Image
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