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Upsilon Orionis — Star in Orion

Magnitude 4.6m Star Orion (Ori) Visible
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1Physical Properties

Magnitude 4.62
Spectral Type B0V
Star Color Blue (B-V -0.26)

2Position & Identifiers

RA 05h 31m 55.8s
Dec -07° 18' 05.0"
Constellation Orion (Ori)
HR 1855
HIP 25923
HD 36512
SAO 132222
Bayer Upsilon
Flamsteed 36 Ori
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 Nov – Jan (peak: Dec)

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

Ori OB1c; sword of Orion.
Expanding circumstellar shell.
Thabit; Tabit. See HR 1543.

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 1999
Medium
Reflection nebula around a bright star
Reflection Nebula mag 9.50 1.3° Orion
Nair al Saif
HIP 26241; Iota Orionis; 44 Orionis
Easy
Easy double, sep 11.2″
Double Star mag 2.77 1.6° Orion
NGC 1980
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 2.50 1.6° Orion
Theta Ori
HIP 26221; Theta1 Orionis; 41 Orionis
Easy
Hot blue O-type star
Star mag 5.13 2.1° Orion
NGC 1973
Medium+
Diffuse nebula
Diffuse Nebula mag 7.00 2.7° Orion
Show on Map

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