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HIP 81304 — Star in Scorpius

Magnitude 4.2m Star Scorpius (Sco) Visible
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1Physical Properties

Magnitude 4.16
Range 4.15 - 4.18
Variable Type Slow Irregular Variable
Spectral Type K6III giant
Star Color Red (B-V 1.57)
Distance 148 ly

2Position & Identifiers

RA 16h 36m 22.5s
Dec -35° 15' 20.0"
Constellation Scorpius (Sco)
HR 6166
HIP 81304
HD 149447
SAO 207814
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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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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15

Light Travel Time Machine

16

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.

Larawag
HIP 82396; Epsilon Scorpii; 26 Scorpii
Easy
Bright naked-eye star, mag 2.3
Star mag 2.29 3.0° Scorpius
NGC 6139
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.2 4.0° Scorpius
Pipirima
HIP 82545; Mu Scorpii
Easy
Hot blue O-type star
Star mag 3.57 4.2° Scorpius
NGC 6242
Easy
Rich open cluster
Open Cluster mag 6.4 5.7° Scorpius
V923 Sco
Hard+
Eclipsing binary, period 34.8d
Variable Star mag 5.91 6.2° Scorpius
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