Gemini, the Twins (Gem)

(JEM-uh-nye)

The Northern constellation of Gemini, the Twins, is best viewed in Winter during the month of February. It's brightest star is Pollux at magnitude 1.15. The boundary of the Gemini constellation contains 11 stars that host known exoplanets.

1. Pronunciation:
2. JEM-uh-nye

1. Meaning:
2. Twins

1. Genitive:
2. Geminorum

1. Abbreviation:
2. Gem

1. Constellation Family:
2. Zodiacal

1. Hemisphere:
2. Northern

1. Quadrant:
2. NQ2

1. Best viewing month*:
2. February

1. Right Ascension (avg):
2. 6h 51m

1. Declination (avg):
2. 24° 49'

1. Meteor showers:
2. Geminids

1. Brightest star:
2. Pollux (1.15)

1. Stars with planets:
2. 11

1. Messier catalog objects:
2. M35 |

1. Caldwell catalog objects:
2. C39 |

Brightest Stars in Gemini

The 10 brightest stars in the constellation Gemini by magnitude.

1. Star
2. Magnitude
3. Spectral class

1. Beta Geminorum (β Gem)
2. 1.16
3. K0III

1. Alpha Geminorum (α Gem)
2. 1.9
3. A2Vm

1. Gamma Geminorum (γ Gem)
2. 1.93
3. A0IV

1. Mu Geminorum (μ Gem)
2. 2.87
3. M3.0III

1. Alpha Geminorum (α Gem)
2. 2.88

1. Epsilon Geminorum (ε Gem)
2. 3.06
3. G8Ib

1. Eta Geminorum (η Gem)
2. 3.31
3. M3III

1. Xi Geminorum (ξ Gem)
2. 3.35
3. F5IV

1. Delta Geminorum (δ Gem)
2. 3.5
3. F0IV

1. Kappa Geminorum (κ Gem)
2. 3.57
3. G8III

Double Stars in Gemini

These are the brightest and easiest-to-find double, triple, and quadruple star systems in the constellation Gemini. Also see all star clusters.

1. Star system
2. Magnitudes
3. Type

1. Delta Geminorum
2. 3.6, 8.2
3. double

1. Alpha Geminorum
2. 1.9, 3.0
3. double

Star Clusters in Gemini

The most notable and easy-to-find star clusters in the constellation Gemini . Also see all star clusters.

1. Star cluster
2. Catalog #
3. Cluster type

1. Messier 35
2. M35
3. open

1. NGC 2129
3. open

1. NGC 2158
3. open

1. NGC 2355
3. open

Nebulae in Gemini

Notable and easy-to-find nebulae in the constellation Gemini . Also see all nebulae.

1. Nebula name
2. Catalog #
3. Nebula type

1. Eskimo Nebula
2. C39
3. planetary

1. Jellyfish Nebula
3. supernova remnant

1. Medusa Nebula
3. planetary

Neutron Stars in Gemini

These are the most well-known neutron stars in the constellation Gemini. Although neutron stars cannot be seen in any amateur telescope, they are at the center of many supernova remnant nebulae, which can be seen. Also see all neutron stars.

1. Neutron star
3. Type

1. Geminga
3. pulsar

1. Jellyfish Nebula pulsar
3. pulsar

Black Holes in Gemini

These are the most well-known smaller (non-supermassive) black holes in the constellation Gemini. Although black holes cannot be seen directly, the smaller ones are at the center of some star clusters and supernova remnant nebulae, which can be seen. Supermassive black holes are at the center of most galaxies, such as Sagittarius A* at the center of our Milky Way galaxy. Also see all black holes.

1. Black hole
3. Type

1. LB-1
3. stellar

Exoplanets in Gemini

These are the most notable named exoplanet systems known in the constellation Gemini. Bear in mind that we will likely discover billions of exoplanets in the years to come. Also see all exoplanets.

1. Host star name
3. Exoplanet name

1. Pollux
3. Thestias

* For southern latitudes, flip the season listed. For example, if a constellation is listed as best viewed in the summer in the month of July, in the southern hemisphere the constellation would be best viewed in the winter in January and would be upside-down.

** Circumpolar constellations are visible year-round in the hemisphere listed (and not at all in the opposite).