Dschubba
HIP 78401; Delta Sco; 7 Sco
HIP 78401; Delta Sco; 7 Sco
DoubleStar
Sco
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
2.32
Range
1.6 - 2.3
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B0.3 IV
Star Color
Blue-white
(B-V -0.12)
Distance
396.1 ly
Position & Identifiers
RA
16h 00m 20.0s
Dec
-22° 37' 18.0"
Constellation
Sco
HR
5953
HIP
78401
Bayer
Delta
Flamsteed
7 Sco
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Visibility
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Multiple Star System
Components
4
Component IDs
O
Separation
0.1″
Companion Mag
4.6
Companion Sp
B2
Position Angle
16°
Star Colors
A: Blue-white
B: Blue
Discoverer
LAB 3
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: 16° · 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
Possible quadruple system: SB 3.0, 5.0v, sep. 0.00001", 3.3v at 0.1", and 4.9v at 0.186".
Primary SB about 20d. Another companion 4.9v at 0.181", discovered by occultation and speckle interferometry, has | longer period. Resolved by speckle observations 1986.45, sep. 0.17".
Color excess E(B-V) = +0.16. Conspicuous infrared deficiency.
Sco OB2; Sco-Cen cluster; upper Sco region; HII region.
Dschubba; Iclarkrau.
Diam. = 0.00045 - 0.00046".
Survey Image
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