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Theta Lupi — Star in Lupus

Magnitude 4.2m Star Lupus (Lup) Visible
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1Physical Properties

Magnitude 4.23
Spectral Type B2.5Vn
Star Color Blue (B-V -0.17)

2Position & Identifiers

RA 16h 06m 35.5s
Dec -36° 48' 08.0"
Constellation Lupus (Lup)
HR 5987
HIP 78918
HD 144294
SAO 207332
Bayer Theta
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium+ Medium
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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7

Size Comparison

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8

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

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

14

Stellar Fusion

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15Stellar Notes

Sco-Cen stream; member of the local association (Pleiades group); probable member of Sco-Cen cluster; upper Cen group of | Sco-Cen assoc.
Rapidly rotating star that might become Be star.

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.

Eta Lup
Easy
Colorful double, sep 14.8″
Double Star mag 3.41 2.0° Lupus
V856 Sco
Medium
Variable star, range 7.0–7.7
Variable Star mag 7.05 2.3° Scorpius
NGC 5986
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.1 4.2° Lupus
NGC 6124
Easy
Rich open cluster
Open Cluster mag 5.8 5.3° Scorpius
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