What to see in September? – astronomia-iniciacion.com

Objects visible in the sky in September

This is a list of some of the brightest and most interesting celestial objects that can be seen in the September night sky.

The objects are grouped in three blocks. Those that can be easily seen with the naked eye , without binoculars or telescopes, which can be easily seen with binoculars and those that can be seen require a telescope .

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Meaning of the abbreviations in the Type column

Gal Galaxy
Its T Star
Double Double Star
Var Variable Star
Neb Nebula
ND Diffuse Nebula
NP Planetary Nebula
DO NOT Dark Nebula
AC Open Cluster
CG Globular Cluster


  • Naked eye
  • With binoculars
  • With telescopes

Objects visible to the naked eye in the southern hemisphere in September.

Altair Aql Its T The brightest star of the Eagle. Its name means “eagle in flight”. Dist 16.7 to
to Centauri Cen Double The bright star closest to the Sun at 4.4 at the telescope appears as a bright double star. Period of 80 years.
ß Centauri Cen Its T Together with Alpha Centauri forms the so-called “Pointer of the Cross”. Dist 525 al
Coalsack Cru Neb The dark nebula visible to the naked eye most famous. It requires dark skies. Its name means “Sack of coal”. Dist 600 al
Deneb Cyg Its T The brightest star in the Swan. Bluish supergiant of about 20-25 solar masses and a radius between 200 and 300 solar radios. He has a short life left and will become a supernova within a few million years. One of the greatest known supergiants. Dist 1,400 to
Achernar Eri / td> Its T The brightest star of Eridanus, The River. Its name in Arabic means “the end of the river”. Dist 140 al
to Herculis Her Var Semi-regular variable. Its magnitude varies between 3.1 and 3.9 in 90 days. He has a companion of mag 5,4.
Vega Lyr Its T The 5th brightest star in the sky. A blue-white star. Dist 25 al
Fomalhaut PsA Its T The brightest star of Pisces Austrinus. Its name in Arabic means “the mouth of the fish”. Dist 25 al
Antares Sco Its T Supergiant red star. Its name means “rival of Mars”. Dist 135.9 al
Spica Vir Its T Its name in Latin means “ear of wheat” and it is found in the left hand of Virgo. Dist 250 al

Objects easy to see with binoculars in the southern hemisphere in September.

NGC 6397 Ara CG It is believed to be the closest globular. Dist 7000 al
M2 Here CG One of the most compact and rich accumulations known. It contains about 150,000 stars.
? Centauri Cen CG The largest and brightest globular cluster in the sky. It contains several million stars. Dist 18000 to the estimated Age 12 billion years.
NGC 4755 Cru AC The Jeweler Outstanding cluster of stars. A lot of contrast of colors, with a central red supergiant surrounded by blue stars. Dist 7600 to
? Cygni Cyg Its T Pulsating variable star of long period. Magnitude that oscillates between +3,62 and +15,00 in 407 days, the greater change of luminosity known in a star. Distance 300 to
LMC Dor Gal Large Cloud of Magellan. A galaxy neighboring the Milky Way, the third closest. Dist 180000 al
M13 Her CG The best globular cluster in the northern hemisphere. Discovered by Halley in 1714. Dist 23000 al
R Hydrae Hya Var It is a bright red giant variable of long period. Its mag varies between +3.5 and +10.9 during 389 days.
R Lyrae Lyr Its T Variable star that goes from mag 5 to 3.88 in 46 days. It is a red giant in the last stages of its life.
e Lyrae Lyr Double Famous double double. The binoculars show a double star. More increases reveal that each is double as well. It is located at 180
M10 Oph CG At 3 degrees from the weakest M12. Both can be glimpsed with binoculars. Dist 14000 al
? Pavonis Pav Var Typical Cepheid variable. Its mag varies between 3.9 and 4.8 in 9.088 days.
NGC 6752 Pav CG One of the best and most beautiful globular in the sky. Dist 14000 al
M15 Peg CG One of the densest clusters of the Milky Way. The only known globular containing a planetary nebula. Mag 14. Distance 33.600 to
M8 Sgr ND Lagoon Nebula Bright nebula crossed by a dark black line. Dist 5200 to the Discovered in 1747 by Guillaume Le Gentil .
M22 Sgr CG A spectacular globular cluster. It has found 32 variable stars and a planetary nebula. Dist 10000 al
M25 Sgr AC Brilliant cluster located about 6 degrees N of the teapot. Dist 1900 al
M4 Sco CG A globular closed. It can just be visible without optical help. Dist 7000 to Perhaps the globular cluster closest to the Solar System. It was the first in which individual stars were resolved.
M6 Sco AC Butterfly Cluster. More than 30 stars with binoculars of 7 increases. Dist 1960 al
M7 Sco AC Superb open cluster, also called Ptolemy’s Cluster. Visible to the naked eye Age 260 million years. Dist 780 al
NGC 253 Scu Gal Call the Galaxy the silver coin. We see it almost singing. It is a barred spiral discovered by Caroline Herschel in 1783. Dist 12.9 million
M5 Be CG Beautiful globular cluster. The telescope will reveal point stars. Dist 25000 al
NGC 6025 TrA AC Small open cluster in the Milky Way. Dist 2700 al
47 Tucanae Tuc CG Spectacular object, the second brightest cluster. A telescope will reveal stars. Near the edge of the Small Magellanic Cloud. Dist 20000 al
SMC Tuc Gal Small Cloud of Magellan Neighbor of the Milky Way. It requires dark skies. Dist 210000 al
Cr 399 Vul AC Broschi or Hanger Cluster. It is not really a cluster. Composed of about 40 stars. Ideal for binoculars. Dist 218 to 1140 al

Objects easy to see with telescopes in the southern hemisphere in September.

NGC 7009 Aqr NP Saturn Nebula It requires an 8-inch telescope to see the resemblance to the planet Saturn and its rings, seen in profile.
NGC 7293 Aqr NP Call Nebula of the Helix. Estimated age 10,600 years. Distance 680 to
NGC 5128 Cen Gal Crossed by a dark strip. Strong radio source. Dist 11 mill al
Albireo Cyg Double Beautiful double star. Contrast of colors orange and blue greenish. Sep 34.4 “.
? Delphini Of the Double They appear yellow and white. Mags 4.3 and 5.2. Dist 100 to The double Struve 2725 in the same field.
M83 Hya Gal Classic spiral seen from the front in a beautiful field of stars. Discovered in 1752 by Lacaille.
5822 Lup AC Large and attractive cluster. Dist 1800 to The open cluster NGC 5823 to the south.
ß Lyrae Lyr Double Binary eclipsing. Its magnitude varies between 3.3 and 4.3 in 12,940 days. The weakest blue star in mag 7.2.
M57 Lyr NP Ring Nebula. Magnificent object. Smoke ring shape. Dist 4100 to
M20 Sgr ND Trifid Nebula A telescope shows 3 lines of dust sectioning the nebula. Dist 5200 al
M17 Sgr ND Omega nebula It contains the cluster NGC 6618. Dist 4900 al
6124 Sco AC It contains 5 bright stars squeezed near the center. Chain of 7 stars. Dist 1600 al
M11 Sct AC Wild Duck Cluster. It looks like a globular with binoculars. Shape of V. Dist 5600 to
M16 Be ND Nebula of the Eagle. It requires large aperture telescopes. Dist 8150 al
M27 Vul NP Dumbbell nebula. Large, shaped like two lobes. The most spectacular planetary. Dist 975 al

Keep in mind that all objects, except the stars, appear more impressive when viewed through large binoculars or a telescope .

Tips for observing the night sky

When observing the night sky , and in particular the objects of deep sky, such as star clusters, nebulae and galaxies, it is always better to do it from a dark place. Avoid direct light from street lighting or other sources. If possible, it should be observed from a dark place away from the light pollution that surrounds most large cities today. You can see more stars when your eyes have adapted to the darkness, usually around ten to twenty minutes after being exposed to light.

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If you need to use a flashlight to see a map of the sky, you should cover the bulb with red cellophane. We can also buy flashlights with red light that can be easily found in stores.

Finally, even though the Moon is one of the most impressive objects to see through a telescope, its light is so bright that it illuminates the sky and makes many of the weak objects more difficult to see. Therefore, it is convenient to observe the night sky on moonless nights, preferably in the New Moon or in the Lower Quarter.