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Upsilon Geminorum — Star in Gemini

Magnitude 4.1m Star Gemini (Gem) Visible
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Observe

1Physical Properties

Magnitude 4.06
Range 4.04 - 4.09
Variable Type Slow Irregular Variable
Spectral Type M0III-IIIb giant
Star Color Red (B-V 1.54)
Distance 233 ly

2Position & Identifiers

RA 07h 35m 55.3s
Dec +26° 53' 45.0"
Constellation Gemini (Gem)
HR 2905
HIP 36962
HD 60522
SAO 79533
Bayer Upsilon
Flamsteed 69 Gem
SIMBAD

3How easy to spot?

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

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

Wolf 630 group.
Ultraviolet FeII emission.
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.

Pollux
HIP 37826; Beta Geminorum; 78 Geminorum
Easy
Bright naked-eye star, mag 1.1
Star mag 1.14 2.4° Gemini
NGC 2420
Easy
Open cluster
Open Cluster mag 8.3 5.4° Gemini
Eskimo Nebula
NGC 2392
Medium+
Small bright planetary nebula
Planetary Nebula mag 9.2 6.2° Gemini
NGC 2418
Hard+
Elliptical galaxy
Galaxy mag 13.0 9.0° Gemini
Show on Map

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