When is the best time to observe HIP 74941?

HIP 74941 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is HIP 74941 located in the sky?

HIP 74941 lies in the constellation Circinus at right ascension 15h 19m and declination -60° 30′.

What telescope do I need to see HIP 74941?

At magnitude 5.5, HIP 74941 is visible to the naked eye from dark skies, easy in any binoculars.

HIP 74941 — Star in Circinus

Magnitude 5.5^m Star Circinus (Cir) Visible

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Observe

1Physical Properties

Magnitude 5.46

Spectral Type O7.5III((f)) giant

Star Color Blue-white (B-V -0.10)

2Position & Identifiers

RA 15h 18m 48.9s

Dec -60° 29' 47.0"

Constellation Circinus (Cir)

HR 5680

HIP 74941

HD 135591

SAO 253101

SIMBAD

3How easy to spot?

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Medium	Hard+	Hard
50 mm finder 50mm finder	Easy	Easy	Easy
150 mm telescope 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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7

Compare Stars

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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

Double Star

Companions: B, B9V; C, A-type spectrum.

Spectral

Also classified O7I.

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.

Delta Cir

Easy

Hot blue O-type star

Star mag 5.09 0.5° Circinus

AX Cir

Hard+

Pulsating variable, period 5.3d

Variable Star mag 5.87 4.5° Circinus

Rigil Kentaurus

HIP 71681; Alpha2 Centauri

Easy

Easy double, sep 8.1″

Double Star mag 1.33 4.8° Centaurus

Open Cluster mag 7.9 5.2° Circinus

NGC 5938

Hard+

Barred spiral galaxy

Galaxy mag 11.49 6.7° Triangulum Australe

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