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Monoceros

Genitive: Monocerotis

Equatorial 482 sq° Mon

Brightest star: Beta Monocerotis

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Mythology

The Unicorn, a relatively modern constellation. Beta Monocerotis is one of the finest triple star systems in the sky.

Observing Highlights

Lies in a rich Milky Way field between Orion and Canis Major. Contains the Rosette Nebula (NGC 2237), Christmas Tree Cluster (NGC 2264), and Hubble's Variable Nebula (NGC 2261).

Main Stars

20
Alpha Mon

HIP 37447; Alpha Mon; 26 Mon

3.93 mag K0 III
Gamma Mon

HIP 29651; Gamma Mon; 5 Mon

3.98 mag K1.5IIIBa0.3
Delta Mon

HIP 34769; Delta Mon; 22 Mon

4.15 mag A2V
Zeta Mon

HIP 39863; Zeta Mon; 29 Mon

4.34 mag 33.2″ B: 10.3 G2Ib
Epsilon Mon

HIP 30419; Epsilon Mon; 8 Mon

4.44 mag 12.1″ B: 6.6 A5IV
18 Mon

HIP 32578; 18 Mon

4.47 mag 0.6″ B: 11.0 K0+IIIaBa0.2
13 Mon

HIP 31216; 13 Mon

4.50 mag A0Ib
Beta Mon

HIP 30867; Beta Mon; 11 Mon

4.60 mag 7.3″ B: 5.0 B3Ve
15 Mon

HIP 31978; 15 Mon

4.66 mag 3.0″ B: 7.8 O7V((f))
28 Mon

HIP 39211; 28 Mon

4.68 mag K4III
17 Mon

HIP 32533; 17 Mon

4.77 mag K4III
20 Mon

HIP 34622; 20 Mon

4.92 mag K0III
27 Mon

HIP 39079; 27 Mon

4.93 mag K2III
3 Mon

HIP 28574; 3 Mon

4.95 mag 2.0″ B: 8.0 B5III
19 Mon

HIP 33971; 19 Mon

4.99 mag B1V
2 Mon

HIP 28325; 2 Mon

5.03 mag A6IIIm vs
HIP 29417
5.05 mag B2V
10 Mon

HIP 30772; 10 Mon

5.06 mag 77.0″ B: 9.6 B2V
HIP 32558
5.07 mag M1+Ib-IIa
HIP 31278
5.10 mag B5Vn

Double Stars

15
Beta Mon

HIP 30867; Beta Mon; 11 Mon

4.60 mag 7.3″ B: 5.0 B3Ve
HIP 30422
6.72 mag 12.1″ B: 6.6 F5V
Epsilon Mon

HIP 30419; Epsilon Mon; 8 Mon

4.44 mag 12.1″ B: 6.6 A5IV
HIP 36640
5.90 mag 23.9″ B: 8.7 F5V
HIP 39675
6.23 mag 30.6″ B: 7.8 B9V
HIP 31066
6.14 mag 16.2″ B: 9.1 B2V:nne
HIP 30675
6.27 mag 20.8″ B: 9.2 A0Vn
HIP 33873
6.17 mag 24.6″ B: 10.1 G5II
V569 Mon

HIP 34234

6.49 mag 6.4″ B: 10.1 B0.5V+F5III
14 Mon

HIP 31385; 14 Mon

6.45 mag 11.0″ B: 10.6 A0V s
HIP 30906
6.16 mag 19.4″ B: 10.4 gM1
HIP 32851
5.77 mag 6.6″ B: 11.1 F2V
15 Mon

HIP 31978; 15 Mon

4.66 mag 3.0″ B: 7.8 O7V((f))
HIP 29711
5.99 mag 4.3″ B: 10.0 A5IV s
10 Mon

HIP 30772; 10 Mon

5.06 mag 77.0″ B: 9.6 B2V

Variable Stars

2
T Mon

HIP 30541

5.98 mag 5.6 - 6.6 DCEP F7Iab-K1Iab
1 Mon

HIP 28321; 1 Mon

6.12 mag 5.94 - 6.31 HADS F2IV

Deep Sky Objects

30
Open Cluster (24)
Caldwell 50

NGC 2244

4.8 mag 24
Messier 50

NGC 2323

5.9 mag 16.
NGC 2232
3.9 mag 30.
NGC 2286
7.5 mag 15.
NGC 2353
7.1 mag 20.
Caldwell 54

NGC 2506

7.6 mag 7
NGC 2301
6.0 mag 12.
NGC 2251
7.3 mag 10.
NGC 2252
8.0 mag 20.
NGC 2335
7.2 mag 12.
NGC 2343
6.7 mag 7.
NGC 2215
8.4 mag 11.
NGC 2236
8.5 mag 7.
NGC 2324
8.4 mag 8.
Rosette nebula

NGC 2239

— mag 16.
NGC 2250
9.0 mag 8.
NGC 2302
8.9 mag 3.
NGC 2259
11.0 mag 5.
NGC 2311
10.0 mag 7.
NGC 2254
9.7 mag 4.
NGC 2269
10.0 mag 4.
NGC 2309
11.0 mag 3.
NGC 2368
12.0 mag 5.
NGC 2262
11.0 mag 4.
Galaxy (1)
NGC 2377
15.0 mag 1.8 Sc
Planetary Nebula (1)
NGC 2346
— mag 0.9
Emission Nebula (2)
Rosette Nebula

NGC 2237

C49

6.0 mag 80
IC 448
— mag 15.
Diffuse Nebula (1)
IC 2169
— mag 25.
Reflection Nebula (1)
Hubble's Variable Nebula

NGC 2261

C46

10.0 mag 2