While northern hemisphere observers can see dozens of constellations at different times of the year, seven are traditionally associated with the winter sky: Orion, Perseus, Taurus, Canis Major, Cetus, Eridanus, and Gemini.
In addition, several northern constellations are circumpolar from mid-northern latitudes and can be seen throughout the year as they appear to circle the North Star (Polaris). These include Cassiopeia, Cepheus, Draco, Ursa Major, and Ursa Minor.
What Constellations Can Be Seen in Winter?
In this post, seven prominent northern winter constellations are presented in an easy-to-digest format for quick reference. Each section highlights a notable deep-sky object, together with other interesting sights that can be explored with binoculars or a modest telescope. More detailed guides to individual star constellations can be found by following the links provided.
Let us begin our tour of some of the most prominent constellations of the northern winter sky.
Orion Constellation
- Constellation: Orion
- Best seen: At 21:00 (9 PM local time) during January
- Visible between latitudes: +85° and -75°
- Messier objects: M42, M43, M78
- Brightest star: Rigel (Beta Orionis), magnitude 0.18
- Neighboring constellations: Eridanus, Gemini, Lepus, Monoceros, and Taurus
Orion Nebula (M42)
The Orion Nebula (M42) lies in the middle of Orion’s Sword. To the naked eye it appears as a slightly fuzzy patch rather than a sharp stellar point, while binoculars reveal a brighter central region surrounded by the spreading glow of the nebula.
Situated about 1,350 light-years away, M42 is a vast stellar nursery where new stars are forming from clouds of gas and dust. Through a small telescope its structure becomes much more apparent, with bright nebulosity extending outward from the central region.
M42 spans roughly 24 light-years and contains the famous Trapezium, a compact group of young, hot stars whose intense ultraviolet radiation illuminates and ionizes the surrounding gas. Four of its brightest stars can be resolved with a modest telescope under good conditions.
Other notable sights in Orion include the red supergiant Betelgeuse, the Horsehead Nebula, De Mairan’s Nebula (M43), and the three bright stars of Orion’s Belt. The Orionids meteor shower also has its radiant in the constellation.
Perseus
- Constellation: Perseus
- Best seen: At 21:00 (9 PM local time) during December
- Visible between latitudes: +90° and -35°
- Messier objects: M34, M76
- Brightest star: Mirfak (Alpha Persei), magnitude 1.79
- Neighboring constellations: Andromeda, Aries, Auriga, Camelopardalis, Cassiopeia, Taurus, and Triangulum
The Double Cluster (NGC 869 & NGC 884)
The Double Cluster is one of the finest binocular sights in the winter sky. Under dark conditions the pair can be detected with the naked eye as a hazy patch between Perseus and Cassiopeia, while binoculars immediately separate it into two concentrations of stars.
Known individually as NGC 869 and NGC 884, the clusters lie roughly 7,500 light-years away and are only around 14 million years old. They are physically associated and contain numerous luminous young blue-white stars along with several contrasting orange and red stars.
A wide-field telescope shows both clusters together, while higher magnification reveals hundreds of individual stars. Perseus is also home to the California Nebula (NGC 1499) and Little Dumbbell Nebula (M76), while the famous Perseid meteor shower has its radiant in the constellation.
Taurus
- Constellation: Taurus
- Best seen: At 21:00 (9 PM local time) during January
- Visible between latitudes: +90° and -65°
- Messier objects: M1, M45
- Brightest star: Aldebaran (Alpha Tauri), magnitude 0.85
- Neighboring constellations: Aries, Auriga, Cetus, Eridanus, Gemini, Orion, and Perseus
M45 (The Pleiades)
The Pleiades (M45) is one of the most recognizable open star clusters in the entire sky. It lies about 440 light-years away, while the nearby Hyades is much closer at around 150 light-years.
Several Pleiades stars are easily visible to the naked eye, while binoculars reveal dozens more spread across a field much larger than the full Moon. The cluster actually contains well over 1,000 known stars, most too faint to see without optical aid.
The Hyades forms the distinctive V-shaped head of Taurus. Bright orange Aldebaran appears to belong to this pattern but is actually a foreground star unrelated to the cluster.
Other deep-sky objects in Taurus include the Crab Nebula (M1), Hind’s Variable Nebula (NGC 1555), and the Merope Nebula (NGC 1435). The Taurid meteor showers also have their radiants in the constellation.
Canis Major
- Constellation: Canis Major
- Best seen: At 21:00 (9 PM local time) during February
- Visible between latitudes: +60° and -90°
- Messier objects: M41
- Brightest star: Sirius (Alpha Canis Majoris), magnitude -1.46
- Neighboring constellations: Columba, Lepus, Monoceros, and Puppis
Messier 41 (NGC 2287)
Canis Major contains one Messier object, M41, an attractive open cluster located about four degrees south of Sirius, the brightest star in the night sky. At around 2,300 light-years away, the cluster contains roughly 100 stars spread across an area of sky larger than the full Moon.
M41 is visible as a faint hazy patch under dark skies and is an easy binocular target. A small telescope resolves dozens of stars, including several warmer-colored giants that stand out against the cluster’s bluer stars.
Another impressive deep-sky object in Canis Major is Thor’s Helmet (NGC 2359), an emission nebula shaped by powerful winds from the Wolf-Rayet star at its center.
Cetus
- Constellation: Cetus
- Best seen: At 21:00 (9 PM local time) during November
- Visible between latitudes: +70° and -90°
- Messier objects: M77
- Brightest star: Deneb Kaitos (Beta Ceti), magnitude 2.02
- Neighboring constellations: Aquarius, Aries, Eridanus, Fornax, Pisces, Sculptor, and Taurus
Messier 77 (NGC 1068)
Cetus is the fourth-largest constellation in the sky and contains one Messier object, M77 (NGC 1068). This face-on spiral galaxy lies roughly 45 million light-years away and is particularly notable for its exceptionally bright active nucleus.
M77 is a relatively approachable galaxy for amateur observers because its central region has a high surface brightness. Under a dark sky it can be detected in a small telescope as a compact fuzzy glow, while larger apertures begin to reveal more of the surrounding galaxy.
Cetus occupies part of the sky sometimes called the “Water,” alongside constellations such as Aquarius, Pisces, and Eridanus whose traditional figures are also associated with water.
Eridanus
- Constellation: Eridanus
- Best seen: At 21:00 (9 PM local time) during December
- Visible between latitudes: +32° and -90°
- Messier objects: None
- Brightest star: Achernar (Alpha Eridani), magnitude 0.46
- Neighboring constellations: Caelum, Cetus, Fornax, Horologium, Hydrus, Lepus, Orion, Phoenix, Taurus, and Tucana
Witch Head Nebula (IC 2118)
Located roughly 900 light-years away, the Witch Head Nebula is a large, extremely faint reflection nebula associated with the brilliant star Rigel in neighboring Orion. Its distinctive blue appearance results from dust grains scattering blue light more efficiently than longer wavelengths.
Despite its enormous apparent size, IC 2118 is challenging visually because its light is spread over such a large area. Very dark, transparent skies are essential, and a wide-field view is more useful than high magnification.
Elsewhere in Eridanus, telescopes reveal a number of galaxies, including the striking barred spiral NGC 1300 and the lenticular galaxy NGC 1332.
Gemini
- Constellation: Gemini
- Best seen: At 21:00 (9 PM local time) during February
- Visible between latitudes: +90° and -60°
- Messier objects: M35
- Brightest star: Pollux (Beta Geminorum), magnitude 1.14
- Neighboring constellations: Auriga, Cancer, Canis Minor, Lynx, Monoceros, Orion, and Taurus
NGC 2392 (Caldwell 39)
NGC 2392 is a compact planetary nebula in Gemini located several thousand light-years from Earth. The nebula formed when an aging star expelled its outer layers, leaving a hot stellar remnant at the center whose ultraviolet radiation causes the expanding gas to glow.
A small telescope shows NGC 2392 as a tiny blue-green disk, while increasing the aperture and magnification begins to reveal differences between its bright inner region and fainter outer envelope. Long-exposure images show the much more complicated shells, filaments, and knots of gas surrounding the central star.
Other notable deep-sky objects in Gemini include M35 (NGC 2168), the Jellyfish Nebula, the Medusa Nebula, and Geminga, a neutron star. The annual Geminid meteor shower also has its radiant in the constellation.