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Gemini

Genitive: Geminorum

Northern 514 sq° Gem

Brightest star: Pollux

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Mythology

The Twins Castor and Pollux, inseparable brothers from Greek mythology. Pollux was immortal (son of Zeus) while Castor was mortal. Zeus placed them both in the sky together.

Observing Highlights

Castor is a remarkable sextuple star system. Contains the open cluster M35, the Eskimo Nebula (NGC 2392), and the Jellyfish Nebula. A zodiacal winter constellation and radiant of the Geminid meteors.

Main Stars

20
Pollux

HIP 37826; Beta Gem; 78 Gem

1.14 mag G9III
Alhena

HIP 31681; Gamma Gem; 24 Gem

1.93 mag A1.5IV
Castor

HIP 36850; Alpha Gem; 66 Gem

1.98 mag 5.4″ B: 3.0 A1.5IV+
Tejat Posterior

HIP 30343; Mu Gem; 13 Gem

2.88 mag 121.7″ B: 11.3 M3IIIab
Mebsuta

HIP 32246; Epsilon Gem; 27 Gem

2.98 mag 109.9″ B: 9.6 G9Ib
Propus

HIP 29655; Eta Gem; 7 Gem

3.28 mag 1.9″ B: 6.2 M2IIIa
Alzirr

HIP 32362; Xi Gem; 31 Gem

3.36 mag F5IV-V
Wasat

HIP 35550; Delta Gem; 55 Gem

3.53 mag 5.5″ B: 8.2 F2V Fe-0.5
Kappa Gem

HIP 37740; Kappa Gem; 77 Gem

3.57 mag 7.0″ B: 10.0 G9III
Lambda Gem

HIP 35350; Lambda Gem; 54 Gem

3.58 mag 9.7″ B: 10.7 A3V
Theta Gem

HIP 33018; Theta Gem; 34 Gem

3.60 mag 3.2 - 3.9 A2IV
Mekbuda

HIP 34088; Zeta Gem; 43 Gem

3.79 mag 3.62 - 4.18 DCEP G1Ib
Iota Gem

HIP 36046; Iota Gem; 60 Gem

3.79 mag 0.1″ B: 4.7 G9IIIb
Upsilon Gem

HIP 36962; Upsilon Gem; 69 Gem

4.06 mag M0III-IIIb
Nu Gem

HIP 30883; Nu Gem; 18 Gem

4.15 mag 112.8″ B: 8.0 B6IIIe
1 Gem

HIP 28734; 1 Gem

4.16 mag 0.1″ B: 5.5 G7III
Rho Gem

HIP 36366; Rho Gem; 62 Gem

4.18 mag F0V
Sigma Gem

HIP 37629; Sigma Gem; 75 Gem

4.28 mag 195.5″ B: 10.8 K1III
Tau Gem

HIP 34693; Tau Gem; 46 Gem

4.41 mag 1.8″ B: 11.0 K2-III
30 Gem

HIP 32249; 30 Gem

4.49 mag K0IIICN1Ca1

Double Stars

15
Castor

HIP 36850; Alpha Gem; 66 Gem

1.98 mag 5.4″ B: 3.0 A1.5IV+
Wasat

HIP 35550; Delta Gem; 55 Gem

3.53 mag 5.5″ B: 8.2 F2V Fe-0.5
38 Gem

HIP 33202; 38 Gem

4.65 mag 7.3″ B: 7.8 F0Vp
HIP 36690
6.54 mag 11.7″ B: 8.2 K0II-III+F8V
Pi Gem

HIP 38016; Pi Gem; 80 Gem

5.14 mag 19.0″ B: 11.4 M1IIIa
HIP 36616
5.42 mag 5.6″ B: 10.1 gK2
Kappa Gem

HIP 37740; Kappa Gem; 77 Gem

3.57 mag 7.0″ B: 10.0 G9III
45 Gem

HIP 34440; 45 Gem

5.44 mag 15.9″ B: 10.9 G8III
HR 2366
6.20 mag 7.9″ B: 10.1 K2III
Mebsuta

HIP 32246; Epsilon Gem; 27 Gem

2.98 mag 109.9″ B: 9.6 G9Ib
Nu Gem

HIP 30883; Nu Gem; 18 Gem

4.15 mag 112.8″ B: 8.0 B6IIIe
Lambda Gem

HIP 35350; Lambda Gem; 54 Gem

3.58 mag 9.7″ B: 10.7 A3V
Tejat Posterior

HIP 30343; Mu Gem; 13 Gem

2.88 mag 121.7″ B: 11.3 M3IIIab
25 Gem

HIP 32019; 25 Gem

6.42 mag 30.5″ B: 11.7 G5Ib
63 Gem

HIP 36238; 63 Gem

5.22 mag 42.7″ B: 10.9 F5V+F5V

Variable Stars

7
3 Gem

HIP 29225; 3 Gem

5.75 mag 5.71 - 5.77 ACYG B2.5Ib
Mekbuda

HIP 34088; Zeta Gem; 43 Gem

3.79 mag 3.62 - 4.18 DCEP G1Ib
R Gem

HIP 34356

7.68 mag 6.00 - 14.10 M S3.9e
6 Gem

HIP 29450; 6 Gem

6.39 mag 5.74 - 7.4 SRC M1-2Ia-Iab
TV Gem

HIP 29416

6.56 mag 6.27 - 7.50 LC M0-1Iab
TU Gem

HR 9120

7.30 mag 6.88 - 8.0 SRB C
Theta Gem

HIP 33018; Theta Gem; 34 Gem

3.60 mag 3.2 - 3.9 A2IV

Deep Sky Objects

30
Open Cluster (10)
Messier 35

NGC 2168

5.3 mag 28.
NGC 2129
6.7 mag 7.
NGC 2331
9.0 mag 18.
NGC 2395
8.0 mag 12.
NGC 2420
8.3 mag 10.
NGC 2158
8.6 mag 5.
NGC 2304
10.0 mag 5.
IC 2157
8.4 mag 7.
NGC 2266
10.0 mag 7.
NGC 2355
10.0 mag 9.
Galaxy (17)
NGC 2339
11.6 mag 2.8 Sbc
NGC 2357
14.0 mag 4.5 Sc
NGC 2341
14.0 mag 1.1 Sc
NGC 2342
13.0 mag 1.6 Sc
NGC 2389
12.8 mag 2.1 SABc
NGC 2290
15.0 mag 1.5 Sa
NGC 2487
14.0 mag 2.8 Sb
IC 2185
15.0 mag 0.5 Sbc
IC 2211
14.0 mag 0.8 SBa
IC 2181
15.0 mag 1.0 Sab
IC 2203
14.0 mag 1.2 SBc
IC 2204
15.0 mag 1.1 Sab
NGC 2379
13.5 mag 1.1 S0
IC 2180
15.0 mag 1.2 Sab
IC 2201
15.0 mag 1.3 Sa
IC 2207
15.0 mag 2.0 SBc
NGC 2275
14.0 mag Sa
Planetary Nebula (2)
Eskimo Nebula

NGC 2392

C39

9.2 mag 0.8
NGC 2371
13.0 mag 0.9
Supernova Remnant (1)
IC 443
— mag 50.