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HIP 82706 — 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 6.6m Star Scorpius (Sco) Visible
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1Physical Properties

Magnitude 6.59
Spectral Type WC7+O5-8 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 0.21) (reddened by dust)
Radius 3.5 R☉

2Position & Identifiers

RA 16h 54m 19.6s
Dec -41° 49' 12.0"
Constellation Scorpius (Sco)
HR 6265
HIP 82706
HD 152270
SAO 227390
Variable ID Var?
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

7

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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

Innes and IDS data on components and number of components appear inconsistent. Probably different cluster components | measured.
Component A of visual double, 8.893d, K 142k/s, V0 -27.2k/s, msin3i 1.75, asini 17.4. Same period for both | absorption and emission lines, but differ in phase by 0.5 period.
Strongly reddened.
In cluster NGC 6231 #220. See HR 6260.
Shell of WR component expanding at 1688k/s.

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.

C76
NGC 6231
Easy
Rich open cluster
Open Cluster mag 2.6 0.0° Scorpius
V919 Sco
Easy
Wolf-Rayet star — rare, hot emission spectrum
Star mag 6.49 0.4° Scorpius
V861 Sco
Medium
Eclipsing binary, period 7.8d
Variable Star mag 6.15 1.1° Scorpius
V918 Sco
Hard+
Hot blue O-type star
Double Star mag 5.47 3.5° Scorpius
NGC 6139
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.2 5.9° Scorpius
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