Home

Objects

Submitted: Tue, 2015-12-01 10:54

NGC 7023

The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158. It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across.

L = 19 * 1200 sec. bin1, RGB = 9 * 1200 sec. bin2, HaOIII = 10 * 1200 sec. bin2, in each filters.

Total exposition - 22 hours

NGC 7023
Submitted: Fri, 2015-10-16 21:26

NGC 7635

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, the 15 ± 5 M☉ SAO 20575 (BD+60 2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.

L = 18 * 1200 sec. bin1, RGB = 9 * 900 sec. bin2, HaOIII = 10 * 1200 sec. bin2, in each filters.

Total exposition - 19.5 hours.

Amounts in the channels:

L - 1.7", RGB - 2.2", HaOIII - 2.1"

NGC 7635
Submitted: Mon, 2015-09-21 12:58

NGC 6888

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000[citation needed] years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

It is a rather faint object located about 2 degrees SW of Sadr. For most telescopes it requires a UHC or OIII filter to see. Under favorable circumstances a telescope as small as 8 cm (with filter) can see its nebulosity. Larger telescopes (20 cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".

L = 18 * 1200 sec. bin1, RGB = 9 * 900 sec. bin2, HaOIII = 10 * 1200 sec. bin2, n the each filters.

Total exposition - 19.5 hours

Pixinsight 1.8, Lightroom.

NGC 6888