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13 Monocerotis — Star in Monoceros

Magnitude 4.5m Star Monoceros (Mon) Visible
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Observe

1Physical Properties

Magnitude 4.50
Spectral Type A0Ib supergiant
Star Color White (B-V 0.00)
Distance 466 ly

2Position & Identifiers

RA 06h 32m 54.2s
Dec +07° 19' 59.0"
Constellation Monoceros (Mon)
HR 2385
HIP 31216
HD 46300
SAO 114034
Flamsteed 13 Mon
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 Nov – Jan (peak: Dec)

5Survey Image

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7

Size Comparison

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8

Compare Stars

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

Discover

15Stellar Notes

R-I also found at -0.02.
Mon OB1; in reflection nebula; member assoc. Mon R1 at 1050 pc.
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.

NGC 2254
Easy
Open cluster
Open Cluster mag 9.7 0.8° Monoceros
T Mon
Easy
Pulsating variable, period 27.0d
Variable Star mag 5.98 1.9° Monoceros
Hubble's Variable Nebula
NGC 2261
Medium
Reflection nebula around a bright star
Reflection Nebula mag 10.0 2.1° Monoceros
Show on Map

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Monoceros
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