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Gamma Lup

HIP 76297; Gamma Lup DoubleStar Lupus (Lup) Visible Level 5 Expert level - Requires steady seeing
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Physical Properties

Magnitude 2.78
Spectral Type B2 IV
Star Color Blue (B-V -0.20)
Distance 408 ly

Position & Identifiers

RA 15h 35m 08.5s
Dec -41° 10' 01.0"
Constellation Lupus (Lup)
HR 5776
HIP 76297
Bayer Gamma

Visibility

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Multiple Star System

Separation 0.8″
Companion Mag 3.5
Position Angle 275°
Star Colors A: Blue B: Blue-white
Discoverer HJ 4786

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 275° A (2.8) B (3.5)

Sep: 0.8″ · PA: 275° · N up, E left

Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

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Stellar Absorption Spectrum

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Stellar Notes

3.5 B2IV-V, 3.6 B2IV-V, 147y, a = 0.59". Combined mag., colors.
Probable member of Sco-Cen cluster; upper Cen group of Sco-Cen assoc.
Spectra obtained in March 1987 at Vainu Bappu Obs. showed H alpha profiles with emission peaks. The star may be in | transition from B to Be type.
Expanding circumstellar shell.

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