Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Gemini (The Twins) Constellation

Gemini (pronounced ˈdʒɛmɪnaɪ) is the Latin name of a constellation situated close to the celestial equator. As such, it is at least partly visible from both hemispheres in certain times of the year.

In English language this constellation is also known as "The Twins" while in astronomical texts and literature this constellation is often abbreviated as "Gem" (according to the standard of the International Astronomical Union - IAU) or as "Gemi" (according to a naming convention used by NASA).

The Latin genitive of the constellation name is "Geminorum" (pronounced ˌdʒɛmɪˈnɒrəm) and it is used to identify some of the brightest stars in this constellation based on the Bayer or Flamsteed star naming convention. For instance: α Geminorum (the brightest star of Gemini based on the Bayer catalog); or 23 Geminorum (the 23th star in the constellation of Gemini based on the Flamsteed catalog).

Gemini is above the horizon from Greenwich, United Kingdom [change]. Altitude: 3°.
Available Resources for Gemini

Sky Chart of Gemini Constellation

Here we provide a simplified sky chart of the Gemini constellation. Alternatively it is possible to locate Gemini in the night sky using our Online Interactive Planetarium.

Chart of  constellation
This constellation image is derivatve work based on original work by IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) CC-BY-3.0.

Visibility of Gemini Constellation

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Gemini rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 67.1°
Max altitude: 61.4°
Azimuth: 292.9°
Gemini is above the horizon from Greenwich, United Kingdom

The rise and set times provided here are just directional indications and they refer to a point approximately placed at the center of the constellation. In case of very large constellations these times can have little relevance.

Bright Stars in Gemini Constellation

The table below lists the top 20 brightest stars in the Gemini constellation. See also the complete list of 123 stars brighter than magnitude 6.5 (approximate) in the constellation of Gemini. Click on each star to see more details about it.

HR Number(*) Star designation Proper name Visual magnitude Color Notes
HR2990 β Geminorum Pollux 1.14 Variable; Multiple;
HR2421 γ Geminorum Alhena 1.93 Multiple;
HR2891 α Geminorum Castor 1.98 Variable; Multiple;
HR2890 α Geminorum 2.88 Multiple;
HR2286 μ Geminorum Tejat 2.88 Variable; Multiple;
HR2473 ε Geminorum Mebsuta 2.98 Variable; Double;
HR2216 η Geminorum Propus 3.28 Variable; Multiple;
HR2484 ξ Geminorum Alzirr 3.36 Variable;
HR2777 δ Geminorum Wasat 3.53 Multiple;
HR2985 κ Geminorum 3.57 Double;
HR2763 λ Geminorum 3.58 Variable; Multiple;
HR2540 θ Geminorum 3.6 Multiple;
HR2650 ζ Geminorum Mekbuda 3.79 Variable; Multiple;
HR2821 ι Geminorum 3.79
HR2905 υ Geminorum 4.06 Variable; Double;
HR2343 ν Geminorum 4.15 Multiple;
HR2134 1 Geminorum 4.16 Variable; Multiple;
HR2852 ρ Geminorum 4.18 Multiple;
HR2973 σ Geminorum 4.28 Variable; Double;
HR2697 τ Geminorum 4.41 Variable; Multiple;
...go to the complete list of 123 bright stars in the constellation of Gemini

(*) HR stands for Harvard Revised Bright Star Catalogue, which is also known as the Yale Catalogue of Bright Stars.

Deep Sky Objects in Gemini Constellation

The table below lists the 20 brightest deep sky objects in the Gemini constellation. See also the complete list of 106 deep sky objects in the constellation of Gemini. The list includes objects from the Messier, New General Catalogue (NGC) and Index Catalogue (IC).

Name Type Magnitude
Messier 35 Open Cluster 5.1 (V)
NGC 2129 Open Cluster 6.7 (V)
IC 444 Reflection Nebula 7.03 (B)
NGC 2395 Open Cluster 8 (V)
NGC 2420 Open Cluster 8.3 (V)
IC 2157 Open Cluster 8.4 (V)
NGC 2331 Open Cluster 8.5 (V)
NGC 2158 Open Cluster 8.6 (V)
NGC 2266 Open Cluster 9.5 (V)
NGC 2392 (Eskimo Nebula) Planetary Nebula 9.61 (V)
NGC 2355 Open Cluster 9.7 (V)
NGC 2304 Open Cluster 10 (V)
NGC 2371 Planetary Nebula 11.2 (V)
IC 443 (Gem A) Supernova Remnant 12 (B)
NGC 2342 Galaxy 12.15 (V)
NGC 2487 Galaxy 12.23 (V)
NGC 2339 Galaxy 12.3 (B)
NGC 2415 Galaxy 12.5 (B)
NGC 2341 Galaxy 12.88 (V)
NGC 2486 Galaxy 13.26 (V)
...go to the complete list of 106 deep sky objects in the constellation of Gemini