British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images Dean Ashton

Observation by Dean Ashton: M57 - High Dynamic Range Image

Uploaded by

Dean Ashton

Observer

Dean Ashton

Observed

2017 Jun 17 - 22:00

Uploaded

2018 Apr 04 - 11:10

Objects

The Ring Nebula (M57)

Planetarium overlay









Constellation

Lyra

Field centre

RA: 18h53m
Dec: +33°01'
Position angle: -6°54'

Field size

0°18' × 0°14'

Equipment
  • 235mm Celestron EdgeHD SCT at /f10
  • Celestron CGEM
  • Celestron Nightscape – TEC 0oC
  • LoadstarX2 guide camera with off-axis guiding
  • Electronic starlight feather touch focuser using BOSS II control system
Exposure

53x300s f/10

Location

St Austell, Cornwall UK

Target name

M57

Title

M57 - High Dynamic Range Image

About this image

An old familiar favourite, the Ring Nebula in Lyra.  In this image I attempted to capture some of the structure in the ring by: capturing in excess of 4-hours of light frames; and combining the use of PixInsight and PhotoShop to create a high dynamic range image.

Recent research has confirmed that M57 is, most probably, actually a ring (torus) of bright light-emitting material surrounding its central star, and not a spherical (or ellipsoidal) shell. Viewed from its equatorial plane, it would thus more resemble the Dumbbell Nebula M27 than its appearance we know from here. We happen to view it from near one pole.

M57 image capture took place on 16th June 2017 from St. Austell, Cornwall.  Weather: 17.2oC. 72% Humidity, pressure 1004mb

M57 image capture also took place on 17th June 2017.  Weather: 16.8oC. 81% Humidity, pressure 1002mb

A total of 53x300second (4 hours and 20 minutes) light frames were calibrated, stacked and initially processed in PixInsight.  In order to create the high dynamic range in this image, five separate images were created in PixInsight with different levels of non-linear stretching.  The five images were then layered and blended in Photoshop to create the single high dynamic rang image.

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.