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U Antliae — Star in Antlia

Carbon Star

Famous for its deep ruby-red color — a rewarding visual target in any telescope.

Read: Carbon Stars — The Reddest Stars You'll Ever See
Magnitude 5.3–6.0m Star Antlia (Ant) Visible
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1Physical Properties

Magnitude 5.38
Range 5.27 - 6.04
Variable Type Slow Irregular Variable
Spectral Type N0:
Star Color Deep ruby red (B-V 2.88)

2Position & Identifiers

RA 10h 35m 12.9s
Dec -39° 33' 46.0"
Constellation Antlia (Ant)
HR 4153
HIP 51821
HD 91793
SAO 201533
Variable ID U Ant
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Hard+ 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 Jan – Mar (peak: Feb)

5Survey Image

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6

Size Comparison

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7

Compare Stars

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

Lb 8.1 - 9.7p. Amp. 0.25V.
Also classified C5,3 (Nb).

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.

NGC 3250
Medium+
Elliptical galaxy
Galaxy mag 11.0 1.7° Antlia
Eight Burst Nebula
NGC 3132
Easy
Small bright planetary nebula
Planetary Nebula mag 8.0 5.5° Vela
C79
NGC 3201
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 6.8 7.6° Vela
Show on Map

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Antlia
Mythology, bright stars, and deep-sky highlights.
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The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
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