Sky & Deep Sky

28 Major Constellations

Named Stars

The Nick Strobel's Tutorial


25 Lesser Constellations

Southern Sky

Messier Tables

The Greek Alphabet

Major Constellations

Winter Spring Summer Autumn Circumpolaris


summer Const







SAGITTARIUS - the Archer - Sgr

Date & Time
Angular separation Al Nasl - Albaldah = 17°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Kaus Australis1.857611.200 B9EpsilonSgr
Nunki2.0217023.200 B2SigmaSgr
Ascella2.60749.360 A2ZetaSgr
Kaus Media2.701404.440 K3DeltaSgr
Kaus Borealis2.81624.680 K1LambdaSgr
Albaldah2.894807.080 F2PiSgr
Al Nasl2.991214.800 K0GammaSgr
Manubrium3.77744.940 G9OmicronSgr
Polis3.8627212.400 B8MuSgr
Rukbat3.9725012.400 B8AlphaSgr
Arkab Prior4.0127011.200 B9Beta1Sgr
Arkab Posterior4.291097.080 F2Beta2Sgr
Terebellum4.70535.500 G5OmegaSgr
Ain Al Rami4.831094.560 K2Nu 1Sgr
sagitt nebule

lagoonLagoon Nebula
M8 - NGC6523
The irregular distribution of stars in this part of thr sky is due mainly to clouds of dust that dim the light of vast clouds of stars that make Sagittarius one of the brightest parts of the Milky Way. The Lagoon Nebula is an illuminated part of such a dark cloud and it reveals the dust as dark lines and globules silhouetted against the luminous gas. Within the nebula is the young star cluster NGC 6350.  (Photograph by David Malin)
Trifid Nebula
M20 - NGC6514
Measuring some forty light years across, the Trifid Nebula contains enough gas to make many thousands of stars. Within it a number of young hot stars have already formed. They cause the surrounding gas, mostly hydrogen, to emit its characteristic red light. However, one side of the nebula contains many dust grains that reflect the star's light, producing a bluish color. In some parts of the nebula the dust grains are so numerous that they hide the glowing gas ,producing three dark lanes, which give this beautiful object its name.  (Photograph by David Malin)
Bright Nebula
Magn. 9.8

omegaOmega Nebula or
Swan Nebula or
Horseshoe Nebula
M17 - NGC6618
Magn. 7.5
Dist. 5.200 l.y.

SCORPIUS - the Scorpion - Sco

Date & Time
Angular separation Dschubba - Shaula = 25°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Antares0.963303.280 M1AlphaSco
Shaula1.6333023.200 B2LambdaSco
Sargas1.872007.240 F1ThetaSco
Dschubba2.3255028.000 B0DeltaSco
Graffias2.6282025.600 B1Beta1Sco
Lesath2.6946023.200 B2UpsilonSco
Alniyat2.8278028.000 B0TauSco
Alniyat2.8958025.600 B1SigmaSco
Rho4.6339522.400 B2RhoOph
Al Acrab5.07856.600 F5XiSco
Jabbah6.355012.400 B8NuSco

M 4M 4 - NGC 6121
Globular Cluster
Magn. 5.9
Dist. 6.800 l.y.
M4 is a globular cluster visible in dark skies about one degree west of the bright star Antares. M4 is perhaps the closest globular cluster at 6.800 light years, meaning that we see M4 only as it was 6.800 years ago, near the dawn of recorded human history. Although containing hundreds of thousands of stars and spanning over 50 light-years, M4 is one of the smallest and sparsest globular clusters known. A particularly unusual aspect for a globular cluster is M4's central bar of stars. M4 is one of the oldest objects for which astronomers can estimate age directly. Cluster white dwarfs appear to be at least nine billion years old - so ancient they limit the youth of our entire universe.
M 80 - NGC 6093
Magn. 7.2 - Dist. 27.100 l.y.

sco.neb.graf The dusty region between Ophiucus and Scorpius contains some of the most colorful and spectacular nebulae ever photographed. The upper part of the picture is filled with the bluish glow of reflected light from hot stars near a huge, cool cloud of dust and gas where stars are born. antares&ro
Dominating the lower half of ther picture is an over-exposed image of the red supergiant star Antares, a star that is steadily shedding material from its distended surface as it nears the end of its life. These solid particles reflect Antares' light and hide it in a nebula of its own making. Finally, partly surrounding Sigma Scorpii at the right of the picture is a red emission nebula, completing the most comprehensive collection of nebular types ever seen in one photograph. (by David Malin - Anglo-Australian Telescope).

M7 - NGC6475
Open Cluster
Magn. 3.4
80 Stars
Dist. 780 l.y.
M6 - NGC6405
Magn. 5.3
80 Stars from 6th magn.
Dist. 1960 l.y.
The Butterfly Cluster
Open Cluster
Magn. 2.6
40 Stars
Dist. 5.900 l.y.

M 7M 7M 6M 6
To some, the outline of the open cluster of stars M6 resembles a butterfly. Like other open clusters, M6 is composed predominantly of young blue stars, although the brightest star is nearly orange. M6 is estimated to be about 100 million years old. Determining the distance to clusters like M6 helps astronomers calibrate the distance scale of the universe.

LYRA - the Lyre - Lyr

Date & Time
Angular separation Vega - Sulaphat = 8°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Vega0.039410.000 A0AlphaLyr
Sulaphat3.2419011.200 B9GammaLyr
Sheliak3.4515012.400 B8BetaLyr
Aladfar4.39163023.200 B2EtaLyr
Alathfar5.128209.040 A3MuLyr
The Ring Nebula - M57
NGC 6720
Planetary Nebula
Magn. 9.7 - Dist. 1960 l.y.
14.8 magn. central star
The famous Ring Nebula M57 is often regarded as the prototype of a planetary nebula, and a showpiece in the northern hemisphere summer sky. Recent research has confirmed that it is, most probably, actually a ring (torus) of bright light-emitting material surrounding its central star, and not a spherical (or ellipsoidal) shell, thus coinciding with an early assumption by John Herschel. There are even indications that the overall shape might be more that of a cylinder viewed along the direction of the axis than that of a ring, i.e., we are looking down a tunnel of gas ejected by a star at the end of its nuclear-burning life.
Color photos show that the material of the Ring is exposing a decreasing ionization level with increasing distance from the 100,000 to 120,000 K hot central star. The innermost region appears dark as it emits merely UV radiation, while in the inner visible ring, greenish forbidden light of ionized oxygene and nitrogene dominates the color, and in the outer region, only the red light of hydrogene can be excited.
The central star is a planet-sized white dwarf star, which shines at about 15th magnitude. Now over 100,000 K hot, it will soon start to cool down, shine as a white dwarf star for a while of several billions of years, and then eventually end as a cold Black Dwarf.
As for most planetary nebulae, the distance to the Ring Nebula M57 is not very wellknown. So, a good value for the distance still needs to be determined.

CYGNUS - the Swan - Cyg

Date & Time
Angular separation Deneb - Albireo = 22°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Deneb1.2514809.360 A2AlphaCyg
Sadr2.208006.240 F8GammaCyg
Gienah2.46724.800 K0EpsilonCyg
Albireo3.083804.440 K3BetaCyg
Azelfafage4.6761020.800 B3Pi 1Cyg
Ruchba5.44-3.160 M2Omega 2Cyg
NGC 7092
Open Cluster
Magn. 5.0 - Dist. 880 l.y.

NGC 7000
The North America Nebula
Bright Nebula
Magn. 7.0 - Dist. 2.300 l.y.
NGC6960 - The Veil Nebula
Bright Nebula
Filamentary, the Cygnus Loop
Magn. 8.0 - Dist. 2.600 l.y.
The large loop of gas was ejected about 30-40.000 years ago from a supernova, a star's final death throes. The loop is still expanding at a rate of 6 arc seconds every hundred years.

gamma cygni gamma cygni 
Sadr (Gamma Cygni) is the central star in Cygnus, the Swan, or Northern Cross, and is surrounded by nebulosity (IC 1318). In the bottom of the picture we see M29, open cluster (NGC6913) magn. 6.6, dist. 4.100 l.y., about 50 stars from 9th magnitude.
Other objects in the pictures are NGC6910, open cluster visible in both pictures, magn. 7.4, dist. 5.400 l.y., 50 stars and Cr 419, open cluster magn. 5.4.

AQUILA - the Eagle - Aql

Date & Time
Angular separation Altair - Al Thalimaim = 18°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Altair0.77168.000 A7AlphaAql
Tarazed2.722694.440 K3GammaAql
Deneb el Okab Aus.2.9911010.000 A0ZetaAql
Al Thalimaim3.4412011.200 B9LambdaAql
Alshain3.71425.080 G8BetaAql
Deneb el Okab Bor.4.021164.680 K1EpsilonAql
Al Thalimaim4.3682016.000 B5IotaAql

OPHIUCUS - the Serpant Bearer - Oph

Date & Time
Angular separation Ras Alhague - Sabik = 29°
Click on a star name for more informations        
NameMagn.Dist. (L.Y.)Temp.°KC.TypeGreekConst.
Ras Alhague2.08498.400 A5AlphaOph
Sabik2.43639.360 A2EtaOph
Fieht2.5653030.400 O9ZetaOph
Yed Prior2.741703.400 M0DeltaOph
Kelb Alrai2.771104.560 K2BetaOph
Yed Posterior3.241084.940 G9EpsilonOph
Marfic3.8233010.000 A0LambdaOph
M10 - NGC6254
m10Globular Cluster
Magn. 6.6
Dist. 14.300 l.y.

m12M12 - NGC6218
Globula Cluster
Magn. 6.6
Dist. 17.900 l.y.

back to top

Constellation pictures are modified screen displaies of Voyager II™ version 2.0 for the Macintosh™, the Astronomy Program of Carina Software, 12919 Alcosta Blvd Suite #7, San Ramon, CA 94583

Go ErectusHome Page

astro taxo sundial

  Please e-mail to Carlo Corti
any suggestion and criticism