Saturday 01 September 2018 - 04:50:00 Posted by  Bobby

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 The Night Skies of September

 Days and nights become equal in length as the equinox approaches, around September 23, marking the start of northern fall and southern spring. The Great Square of Pegasus is well placed for observers in northern latitudes, while in the southern hemisphere the brightest stars are in the western sky.

 Top 2 Constellations For September

 Andromeda (The Chained Princess)


 Mythology of Andromeda

Andromeda is one of the most famous constellations. Andromeda depicts the princess in Greek myth who was chained to a rock as a sacrifice to a sea monster but was saved by the hero Perseus. The constellation contains the nearest major galaxy to us, M31, the Andromeda Galaxy, which is the most distant object visible to the naked eye.

 The Facts

  • Depiction: The Chained Princess
  • Pronounced: an-DROH-me-duh
  • Genitive: Andromedae
  • Abbreviation: And
  • Highest in the Sky: September to October
  • Size Ranking: 19th
  • Coverage Area: 722 Sq. Degrees
  • Right Acension: 1 Hour
  • Declination: 40°
  • Visibility: 90°N to 36°S

 Notable Objects

  • IC 239: Spiral galaxy
  • M31: Andromeda Galaxy
  • M32: Elliptical dwarf galaxy
  • M110: Elliptical dwarf galaxy
  • NGC 404: Elliptical dwarf galaxy
  • NGC 891: Spiral galaxy
  • NGC 7640: Spiral galaxy
  • NGC 7662: Blue Snowball, planetary nebula
  • NGC 7686: Open cluster
  • NGC 752: Open cluster

 Named Stars

  • Alpheratz, Alpha Andromedae
  • Mirach, Beta Andromedae
  • Alamak, Gamma Andromedae
  • Adhil, Xi Andromedae

 Best Viewed Objects/Stars

Gamma Andromedae

One of the most attractive double stars in the sky. It appears to the naked eye as a single star of magnitude 2.1, but even a small telescope will reveal an orange-colored primary, which is a giant star, and a blue companion of 5th magnitude.

The Andromeda Galaxy

 A spiral galaxy, similar to the Milky Way but larger. On a clear, dark night, it can be seen by the naked eye as an elongated smudge. With binoculars or a small telescope, it looks much larger, extending for several Moon diameters. Even so, this is only the central part of the galaxy, and a larger telescope is needed to see any trace of its spiral arms. Lying about 2.5 million light-years away, M31 is the largest galaxy in the Local Group. It has two small elliptical companion galaxies (the equivalent of our Magellanic Clouds), M32 and NGC 205 (or M110), which can be seen with a telescope with an aperture of 4 in (100 mm) or more.

NGC 752

An open cluster, visible through binoculars, consisting of faint stars spread over an area of sky wider than the full Moon. It lies about 1,300 light-years away.

NGC 7662

 A planetary nebula, about 4,000 light-years away. It looks small but prominent through a telescope, like a blue-green star of 9th magnitude; high magnification reveals a rounded outline, like an out-of-focus star.

 Delphinus (The Dolphin)


 Description of Delphinus

Delphinus. This distinctively shaped constellation is faint and far away, but the stars of the dolphin are easy to identify.

 The Facts

  • Depiction: The Dolphin
  • Pronounced: del-FYE-nuss
  • Genitive: Delphini
  • Abbreviation: Del
  • Highest in the Sky: August to September
  • Size Ranking: 69th
  • Coverage Area: 189 Sq. Degrees
  • Right Acension: 21 hours
  • Declination: 10°
  • Visibility: 90°N to 69°S

 Notable Objects

  • Gamma Delphini: Double star
  • NGC 6891: Planetary nebula
  • NGC 6905: Blue Flash Nebula
  • NGC 6934: Globular cluster
  • NGC 7006: Globular cluster

 Named Stars

  • Sualocin, Alpha Delphini
  • Rotanev, Beta Delphini
  • Deneb Dulfin, Epsilon Delphini

 Best Viewed Objects/Stars

Job's Coffin

 A name given to the box shape formed by the four stars Alpha, Beta, Gamma and Delta Delphini, all of which are of 4th magnitude.

Gamma Delphini

 A double star. A small telescope will separate the two components, which appear yellow and white, of magnitudes 4.3 and 5.2. Both stars lie approximately 100 light-years away. A fainter and closer pair of 8th-magnitude stars, known as Struve 2725 (about 125 light-years away), should be visible in the same field of view.

 Features of Interest (August/September)

 Delta Cephei

 This is the prototype of Cepheid variable stars that are used for finding distances in space. The brightness of Delta Cephei rises and falls every 5 days as it pulsates in size; at its peak, the star is more than twice as bright as when at its faintest. Changes in its brightness can be followed with the naked eye by comparing it with nearby stars of known magnitude. Delta Cephei is also an attractive double star, having a fainter companion that is visible with the smallest telescopes.

 M27, The Dumbell Nebula

 The easiest planetary nebula to see with binoculars lies in the often-overlooked constellation of Vulpecula, midway between the bright stars Deneb and Altair. Its popular name, the Dumbbell Nebula, comes from its structure - more like a bow tie than a dumbbell - but this is visible only through a telescope.

 47 Tucanae

 Also known as 47 Tucanae, this is the second most prominent globular cluster in the entire sky - only Omega Centauri is brighter. To the naked eye, it resembles a hazy star. It appears in the sky near the Small Magellanic Cloud but is actually within our own galaxy.

 The Small Magellanic Cloud

 This is the smaller, fainter, and more distance of two irregularly shaped small galaxies accompanying our own. To the naked eye, it looks like a cut off part of the Milky Way. The cluster to its bottom right is NGC 104.

 Meteor Shower Activity

September Meteor Showers

 Also Visible This Month

 Where to?

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