2 Sco
Observable Double Star
Good (47/100)
Sep: 2.0", Companion: mag 7.0
HIP 77840; 2 Sco
DoubleStar
Sco
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.59
Spectral Type
B2.5Vn
Star Color
Blue-white
(B-V -0.07)
Distance
543.6 ly
Position & Identifiers
RA
15h 53m 36.7s
Dec
-25° 19' 38.0"
Constellation
Sco
HR
5904
HIP
77840
Flamsteed
2 Sco
Double Cat
9823
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Visibility
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Multiple Star System
Separation
2.0″
Companion Mag
7.0
Position Angle
273°
Star Colors
A: Blue-white
B: White
Discoverer
BU 36
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 2.0″ · PA: 273° · 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
CPM. Combined mag., color.
Sco OB2; Sco-Cen assoc.; probable member of Sco-Cen cluster; upper Sco region; embedded in reflection nebulosity.
Rapidly rotating star which may become Be star.
Survey Image
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