RSGC1-F01 is a red supergiant star located approximately 22,000 light-years away in the constellation Scutum. With an estimated radius of 1,450 to 1,530 solar radii, it is one of the largest stars known. The supergiant is member of the massive young star cluster RSGC1. Discovered in 2006, the cluster and its members are invisible to the unaided eye and cannot be seen in optical telescopes.| Star Facts
Delta Scuti (δ Sct) is a yellow-white giant located 201 light years away in the constellation Scutum. The star serves as the prototype for a class of variable stars known as the Delta Scuti variables.| Star Facts
Messier 16 (M16), the famous Eagle Nebula, is a star-forming nebula with a young open star cluster located in Serpens. M16 lies near the borders with the constellations Sagittarius and Scutum. The nebula is best known for the Pillars of Creation region, three large pillars of gas famously photographed by Hubble in 1995. Also known… Read More »Messier 16: Eagle Nebula| Messier Objects
Serpens is a large constellation in the northern sky. It represents the snake. It is divided into Serpens Caput (the serpent's head) and Serpens Cauda (the serpent's tail) by the constellation Ophiuchus.| www.constellation-guide.com
Corvus, the Crow, is a small constellation in the southern sky. It represents the sacred bird of Apollo. The constellation is home to the navigational star Gienah and the famous Antennae Galaxies (NGC 4038 and NGC 4039).| www.constellation-guide.com
The Northern Cross is a prominent asterism formed by the brightest stars in the constellation Cygnus. It appears in a rich Milky Way field and outlines the body of the celestial Swan.| www.constellation-guide.com
The Coathanger is an asterism located in the northern constellation Vulpecula (the Fox). With an apparent magnitude of 3.6 and an apparent size of 60 arcminutes, it is visible to the unaided eye.| www.constellation-guide.com
Equuleus is the smallest constellation in the northern sky. It represents a little horse or foal and lies near the larger horse, Pegasus. The constellation is home to the yellow giant Kitalpha and the spiral galaxy NGC 7015.| www.constellation-guide.com
Delphinus is one of the smallest northern constellations. Recognizable for its distinctive quadrilateral shape, the constellation is home to the Blue Flash Nebula (NGC 6905) and the globular clusters NGC 6934 and NGC 7006.| www.constellation-guide.com
Acrux, Alpha Crucis (α Cru), is a multiple star system located at a distance of 320 ly from Earth in the constellation Crux. It is the brightest star of the Southern Cross.| Star Facts
The Saturn Nebula (NGC 7009) is a small but bright planetary nebula located 2,000 to 4,000 light years away in the constellation Aquarius. It can be seen in small and medium telescopes.| www.constellation-guide.com
Hydra is the largest constellation in the sky. Located in the southern celestial hemisphere, the constellation contains the open cluster Messier 48, the Porpoise Galaxy (NGC 2936), and the Southern Pinwheel Galaxy (M83).| www.constellation-guide.com
Cygnus, the Swan, is one of the largest northern constellations. Recognizable for the Northern Cross, it is home to the bright supergiant Deneb, the North America Nebula (NGC 7000) and the Gamma Cygni Nebula (IC 1318).| www.constellation-guide.com
Hercules is one of the largest constellations in the sky. Representing the mythical Greek hero, the constellation is home to the Hercules Globular Cluster (M13), the globular cluster Messier 92, and the Hercules Cluster of galaxies.| www.constellation-guide.com
Ara is a small constellation in the southern sky. It represents the altar. It contains the open clusters NGC 6193 and the Ara Cluster, the planetary nebula known as the Stingray Nebula, and the pre-planetary Water Lily Nebula.| www.constellation-guide.com
Aquarius is one of the constellations of the zodiac. Representing the Water Bearer, the constellation is home to the yellow supergiants Sadalsuud and Sadalmelik and the famous Helix Nebula.| www.constellation-guide.com
Asterisms are defined as patterns formed by stars of one or more constellations. These star patterns are commonly recognized by observers across the world and once served as a basis for the modern 88 constellations.| www.constellation-guide.com
Lupus (the Wolf) is a southern constellation located between Scorpius and Centaurus. It hosts the historic supernova remnant SN 1006, the globular clusters NGC 5824 and NGC 5986, and the Retina Nebula (IC 4406).| www.constellation-guide.com
Crux is the smallest and most distinctive constellation in the southern sky. Recognizable for the Southern Cross, formed by its brightest stars, it is home to the dark Coalsack Nebula and the Jewel Box Cluster (NGC 4755).| www.constellation-guide.com
Cassiopeia is a prominent constellation in the northern sky. Recognizable for its W shape, the constellation is home to the Heart Nebula, the Soul Nebula, the Pacman Nebula, and the open clusters Messier 52 and Messier 103.| www.constellation-guide.com
Canopus, Alpha Carinae (α Car), is a white bright giant star located at a distance of 310 light years from Earth in the constellation Carina. It is the second brightest star in the sky.| Star Facts
Centaurus is a large constellation located in the southern celestial hemisphere. It is home to Alpha Centauri, the nearest star system to Earth, the bright galaxy Centaurus A, and the globular cluster Omega Centauri.| www.constellation-guide.com
AG Carinae (HD 94910) is a luminous blue variable (LBV) located 17,000 light-years away in the constellation Carina (the Keel). It is one of the most luminous stars known in the Milky Way.| Star Facts
Sadalsuud, Beta Aquarii (β Aqr), is a yellow supergiant star located 540 light years away in the constellation Aquarius. It is the constellation's brightest star, with an apparent magnitude of 2.87.| Star Facts
Lyra is a small constellation in the northern sky. It represents the lyre of Orpheus. The constellation is home to Vega, the second brightest northern star, and the Ring Nebula (M57), a famous planetary nebula.| www.constellation-guide.com
Vulpecula is a faint constellation in the northern sky. It represents the little fox. The constellation is home to the red giant Anser, the Dumbbell Nebula (M27), and as asterism known as the Coathanger.| www.constellation-guide.com
Polaris (α UMi), the North Star, is a yellow supergiant located 446 light-years away in the constellation Ursa Minor. The star is part of the Little Dipp| Star Facts
Sagittarius is a large constellation in the southern sky. It is one of the constellations of the zodiac. It contains the Milky Way centre and some of the best known nebulae in the sky.| www.constellation-guide.com
The Southern Cross is a bright, diamond-shaped asterism located in the far southern sky. Formed by the brightest stars of the constellation Crux, the asterism is commonly used to find the south celestial pole.| www.constellation-guide.com
Aldebaran, Alpha Tauri (α Tau), is an orange giant star located at a distance of 65.3 ly from Earth in the constellation Taurus. It marks the eye of the Bull.| Star Facts
Alpha Centauri (α Cen) is a triple star system located at a distance of 4.37 light years from Earth in the constellation Centaurus. It is the nearest star system to the Sun and hosts the nearest extrasolar planets to Earth.| Star Facts
Ophiuchus, the Serpent Bearer, is a large constellation near the celestial equator. Representing the healer Asclepius in Greek mythology, the constellation is visible from both hemispheres.| www.constellation-guide.com
Messier 27 (M27), also known as the Dumbbell Nebula, Diabolo Nebula or Apple Core Nebula, is a planetary nebula in Vulpecula. The Dumbbell Nebula is large in size and quite bright, which makes it a popular object among amateur astronomers. It can be seen in binoculars and small telescopes. The nebula covers an area of… Read More »Messier 27: Dumbbell Nebula| Messier Objects
Antares, Alpha Scorpii (α Sco) is a red supergiant and supernova candidate located at a distance of 550 ly from Earth in the constellation Scorpius. It is the brightest star in Scorpius and one of the brightest stars in the sky.| Star Facts
The Summer Triangle is a northern summer asterism formed by the brightest stars in the constellations Lyra, Aquila and Cygnus. It can be used to find some of the best-known nebulae in the sky.| www.constellation-guide.com
Capricornus is a faint constellation in the southern sky. It represents the goat. The constellation is home to the multiple star system Delta Capricorni (Deneb Algedi) and the bright globular cluster Messier 30.| www.constellation-guide.com
Vega (Alpha Lyrae) is a fast-spinning white main sequence star located 25.04 light-years away in the constellation Lyra. Shining at magnitude 0.026, it is the fifth brightest star in the sky. It forms the Summer Triangle with Altair and Deneb.| Star Facts
Altair, Alpha Aquilae (α Aql), is a white main sequence star located 16.73 ly from Earth in the constellation Aquila. It forms the Summer Triangle with Vega and Deneb.| Star Facts
Deneb (α Cyg) is a blue-white supergiant located 2,615 light-years from Earth in the constellation Cygnus. The luminous star forms the Summer Triangle with Vega and Altair.| Star Facts