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M57 - The Ring Nebula


From the author of   Sizing Up The Universe

Spectral image...
M57

22:05-23:10 EDT August 5, 2021.
Canon T2i DSLR and RSpec Star Analyser 100 diffraction grating on 10" RC at f/9.
60 min (unguided 60 second subexposures).
North is to the right.

Each star appears as an undiffracted spot. Off to the right of each star spot is the order \( m=+1 \) diffracted spectral "streak". Associated with some of the brightest stars, it is also possible to see the order \( m=-1 \) diffracted spectrum off to the left of the star.

The undiffracted (\( m=0 \)) Ring Nebula appears as the nice colorful nebula just to the left of the center of the image. The blue and red rings off to the right are the \( m=+1 \) order diffractions of the nebula. The blue corresponds to O-III emissions from the nebula and the red corresponds to H-alpha emissions.

If your screen is set fairly bright, you might also be able to see the \( m=+2 \) and \( m=-1 \) order diffractions of the Ring Nebula.


This is the version that appeared in APOD
(it's not as good as the one above because of the smoke-filled skies from the fires out west)...
M57

22:19-23:55 EDT July 15, 2021.
Canon T2i DSLR on 10" RC at f/9.
RSpec Star Analyser 100 diffraction grating, 87 min (unguided 60 second subexposures).
The \( m=+1 \) order diffractions appear to the left, not to the right.



M57

21:53-23:29 EDT June 30, 2021.
Starlight Express Trius SX-694 on 10" RC at f/9.
Hα =43min, OIII=43min, (unguided 20 second subexposures).
Richardson-Lucy deconvolution, gamma stretch.



M57

21:44-22:35 EDT July 26, 2016 and 21:41-23:57 EDT July 27, 2016.
Starlight Express Trius SX-694 on 10" RC at f/9.
Hα =110min, OIII=50min, (guided 10 minute subexposures).
Richardson-Lucy deconvolution.

Here's the Hα frames highly stretched to show the surrounding faint nebulosity (and IC1296)
M57

Here's an animated gif of the Hα frames as the stretching is changed
M57


M57 spectra

21:51 EDT August 16, 2018.
Starlight Express Trius SX-H694 on 10" RC at f/9.
RSpec Star Analyser 100 diffraction grating, (44 unguided 30-second subexposures).
The sharp central ring is the undiffracted (m=0) image.
The three overlapping rings above the central ring are Ne-III (386nm), O-III (504nm), and Hα (656nm)
Click on image for 3-times higher resolution image.


M57

22:15 EDT June 26, 2008.
Starlight Express SXV-H9 on 10" RC at f/9.
Hα=140min, OIII=20min, (guided 20 minute subexposures).
PLUS: all prior exposures.
Richardson-Lucy.


M57

Brighter version
M57

02:16 EDT May 23, 2007.
Starlight Express SXV-H9 on 10" RC at f/9.
L=32.5min, Hα =30min, OIII=30min, R=15min, G=15min, B=15min (guided 2.5 and 5 minute subexposures).
Richardson-Lucy, Custom Digital Development.


M57

02:43 EDT May 5, 2005.
Starlight Express SXV-H9 on 10" RC at f/9.
L=13min, Hα =22min, R=8min, G=8min, B=8min (unguided 1-minute subexposures).
Richardson-Lucy, Curves.

NOTE: Comparison with http://c3po.cochise.cc.az.us/astro/images/M57!dss2_3.jpg reveals that the faintest stars in this image are at least mag 20.


M57

23:07 EDT Aug 10, 2005.
Starlight Express SXV-H9 on 10" RC at f/9.
Hα =122min (unguided 30-second subexposures).
Richardson-Lucy, Gamma stretch.

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