Jump to content

Messier 17


Gary

133 views

 

648080099_Messier172020-RGB-proc2-small.jpg.d6b33d47903ed2fcd880bd5e2a350975.jpg

When one has been struggling with cursed objects (DSOs that, despite repeated best efforts, never seem to yield decent data), I have found that it is a good idea to go back to something reasonably basic but still interesting. Messier 17 is just such an object: big, bright, easily identified, and colourful. M 17 goes by several names. The one I grew up with was the Swan Nebula, but it is also known as the Omega Nebula, the Checkmark Nebula, and the Horseshoe Nebula. Most of these names are based on the lighter central region that is seen through most telescopes. If you squint, you can imagine a pale swan gliding leftwards through the middle of the nebula. The distinctive, dark shape that helps form the ‘neck’ of the swan is the result of large clouds of dust blocking the light from emission nebula behind it. M 17 is an HII region in Sagittarius, and resides about 5500 light years from us. Its center is illuminated by one of the youngest cluster of stars; just a million years old.

Date: 13 July 2020
Constellation: Sagittarius
R.A.: 18h 20m 57s
Dec.: -16° 10' 40"
Photo stuff: 18 subs@300s ea.; ISO 800; Canon 60Da on Meade RCX400 16” f/8 with a .7 focal reducer

 

 

 

0 Comments


Recommended Comments

There are no comments to display.

Guest
Add a comment...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...