Pickering's Triangle (or Fleming’s Triangular Wisp), is only a part of the Veil Nebula. It is brightest at the north central edge of the Veil Nebula, but visible in photographs continuing toward the central area of the loop. NGC 6974 and NGC 6979 are luminous knots in a fainter patch of nebulosity on the northern rim between NGC 6992 and Pickering's Triangle.
The Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus. It constitutes a large but faint supernova remnant. The supernova exploded circa 8,000 BC to 18,000 BC, and the remnants have since expanded to cover an area roughly 6 times the diameter of the full moon. The distance to the nebula is not precisely known, but recent data supports a distance of about 2,400 light-years. The nebula was discovered on 1784 Sep 5 by William Herschel.
Too much data to cover here, so below is a link to the Wikipedia page.
https://en.wikipedia.org/wiki/Veil_NebulaCAPTURE Information:
This is a Three-Panel Mosaic. The image was captured with the iOptron CEM120 mount, the venerable Meade 12"LX200 SCT, and my QHYCCD QHY294m Pro mono CMOS camera at F7.16 (2182mm FL).
Image subs were taken through Astronomik's narrowband filters of Ha (hydrogen), OIII (oxygen) and SII (sulfur).
IMAGE information -- 2023
The following is a breakdown of each panel (i.e. panel 1, panel 2 and panel 3 respectively).
Ha : 25, 20 and 20 subs (2.08, 1.67 and 1.67hr) on Aug 21st, 23rd, 24th and 25th and Sep 9th.
OIII : 19, 20 and 20 subs (1.58, 1.67 and 1.67hr) on Aug 23rd and 25th and Sep 7th, 8th, 9th and 16th.
SII : 20, 20 and 20 subs (1.67, 1.67 and 1.67hr) on Aug 23rd and 25th and Sep 9th, 16th and 18th.
All exposures were at 5 minutes (300s) each, 1600 gain, 56 offset, 1x1 bin and -5C.
Each of the three subs group of Ha, OIII and SII were individually integrated, and then assembled using PixInsights mosaic processes. The three assembled panels were then combined for color, using PixiInsight’s “ChannelCombination”, and the Hubble palette of SHO.
Processing was done in PixInsight following good practice and, for the most part, kayronjm's tutorial of Feb. 24th from several years back. Emphasis in color processing was to use the various color masks to adjust the green areas more into red.
Credit also goes to Rick Stevenson’s Color Mask Script and Christopher Gomez’s tutorial.
COMMENTS:
This is the 1st time I’ve run at this particular target (i.e.The Pickering/Fleming Triangle). Previously I had done the Veil Nebula’s Witch’s Broom (NGC6960) with the Atik and CGE Pro in 2017 as a 4-panel mosaic. And also a chunk of the Broom with the Atik and the old Meade Fork Mount in 2013.
ONE LAST THING:
The RA excursions continue, but not so much that keeps me from keeping most of the subs. I do note that the “bubble level” in the iOptron CEM120 is off a bit. So my plan is to re-tighten all the nuts in the Pier, re-level the mount, and do a new Polar alignment. I don’t expect that to pay much dividend, but we can all hope.
Comments