16 Sgr
HIP 89440; 16 Sgr
DoubleStar
Sgr
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
5.95
Spectral Type
O9.5II
Star Color
White
(B-V 0.02)
Position & Identifiers
RA
18h 15m 12.9s
Dec
-20° 23' 17.0"
Constellation
Sgr
HR
6823
HIP
89440
Flamsteed
16 Sgr
Double Cat
11191
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Visibility
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Multiple Star System
Separation
6.1″
Companion Mag
13.0
Position Angle
216°
Star Colors
A: White
B: Yellow-white
Discoverer
BU 286
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 6.1″ · PA: 216° · 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
Companion A3V.
Sgr OB7; exciting star of HII region S35; NGC 6526.
SiII suspected of variability. Also classified O9II, O9III and O9.5II-III((n)).
Survey Image
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