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V919 Scorpii — Star in Scorpius

Wolf-Rayet

Late-stage massive star with a dense stellar wind; radius is taken from published spectral models rather than estimated from spectral class.

Read: Wolf-Rayet Stars — The Shortest, Fiercest Lives in the Galaxy
Magnitude 6.5–6.6m Star Scorpius (Sco) Visible
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1Physical Properties

Magnitude 6.49
Range 6.45 - 6.61
Period 2.0 days
Variable Type Wolf-Rayet Variable
Spectral Type WN7-A Wolf-Rayet
Late-stage massive star with a dense stellar wind; radius is taken from published spectral models rather than estimated from spectral class.
Star Color Blue (B-V 0.23) (reddened by dust)
Radius 17.0 R☉

2Position & Identifiers

RA 16h 52m 19.1s
Dec -41° 51' 16.0"
Constellation Scorpius (Sco)
HR 6249
HIP 82543
HD 151932
SAO 227328
Variable ID V919 Sco
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Hard V. hard+ V. hard
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Apr – Jun (peak: May)

5Survey Image

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6

Size Comparison

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

13

Stellar Fusion

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14Stellar Notes

6.51 - 6.61V, HeI, NII 4097 var. 3.5d.
Strongly reddened.
Sco OB1; HII region; member NGC 6231. See HR 6260.
Circumstellar matter. Helium rich. The A in the spectral type here means narrow lines, not an A-type spectrum.
3.5d not confirmed.

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

HIP 82706
Easy
Wolf-Rayet star — rare, hot emission spectrum
Star mag 6.59 0.4° Scorpius
C76
NGC 6231
Easy
Rich open cluster
Open Cluster mag 2.6 0.4° Scorpius
V861 Sco
Medium
Eclipsing binary, period 7.8d
Variable Star mag 6.15 1.3° Scorpius
V918 Sco
Hard+
Hot blue O-type star
Double Star mag 5.47 3.1° Scorpius
NGC 6139
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.2 5.6° Scorpius
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