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Chi Lupi — Star in Lupus

Magnitude 4.0m Star Lupus (Lup) Visible
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1Physical Properties

Magnitude 3.95
Spectral Type B9III giant
Star Color Blue-white (B-V -0.04)
Distance 195 ly

2Position & Identifiers

RA 15h 50m 57.5s
Dec -33° 37' 38.0"
Constellation Lupus (Lup)
HR 5883
HIP 77634
HD 141556
SAO 207040
Bayer Chi
Flamsteed 5 Lup
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy 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

15.2565d, K 135.6k/s, V0 -16.3Vk/s, asini 28.4. Primary mercury-platinum star B9IV, secondary Am; possibly a third | spectroscopically invisible component.
Sco-Cen assoc.
HgMn star.
16

Light Travel Time Machine

17

Relativistic Travel

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.

Xi Lup
HIP 78105; Xi Lupi
Easy
Easy double, sep 10.2″
Double Star mag 5.12 1.3° Lupus
NGC 5986
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.1 4.3° Lupus
V856 Sco
Medium
Variable star, range 7.0–7.7
Variable Star mag 7.05 6.5° Scorpius
NGC 5843
Hard+
Barred spiral galaxy
Galaxy mag 12.28 9.3° Lupus
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