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19 Monocerotis — Star in Monoceros

Magnitude 5.0m Star Monoceros (Mon) Visible
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1Physical Properties

Magnitude 4.99
Range 4.96 - 5.01
Period 4.6 hours
Variable Type Beta Cephei (Pulsating)
Spectral Type B1V
Star Color Blue (B-V -0.20)

2Position & Identifiers

RA 07h 02m 54.8s
Dec -04° 14' 21.0"
Constellation Monoceros (Mon)
HR 2648
HIP 33971
HD 52918
SAO 134106
Flamsteed 19 Mon
Variable ID V637 Mon
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Medium 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 Dec – Feb (peak: Jan)

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

Beta C 4.96 - 5.01V, 0.19120d, secondary 0.19740d, beat period 6.09d.
H alpha emission. uv indicates gB1.
Rotational velocity vsini 336k/s.

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 2311
Easy
Open cluster
Open Cluster mag 10.0 1.3° Monoceros
NGC 2282
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 10.00 6.9° Monoceros
Show on Map

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