SNR G70.0-21.5 in Pegasus (Andre Vilhena)

SNR G70.0-21.5 in Pegasus

SNR G70.0-21.5 in Pegasus is a poorly known supernova remnant because, I suppose, it is one of the faintest known in the Milky Way, albeit also one of the largest. It began to be discovered in 2002, when some filaments were found in constellation Pegasus. Studies suggest it has around 90,000 years and it is located at about 3,200 light years, within the galactic halo and unusually far from the galactic plane. Its size is estimated in 290 light years.
Some of its filaments are quite straight when compared with other SNR, which indicates its old age.

This image covers an area of 6.4º x 5.2º.

During my research I could not find any photo of it besides one in a recent paper. Due to its extreme faintness, it was a real challenge to capture and process. Due to its large size, a mosaic was needed and due to several constrains, panels frames were taken in wildly different skies (Bortle 8 and Bortle 4). Also, I feel some more hours are needed to better highlight the (few) details it has.

Besides this photo, first version contains the starless Ha image, where the SNR shape is better defined.

All in all, while not the most visually appealing photo I took, it was one for sure of the most interesting projects I've worked on.

Hope you enjoy.

Technical data:

Integration time:

Ha: 25h00
RGB: 13h26

Panel 1 (left)
Ha >> 07.Aug, 08.Aug, 01.Oct | 192 x 300 s (Barcarena, Portugal - Bortle 8)
RGB >>29.Sep | 326 x 60 s

Panel 2 (right)
Ha >> 09.Aug, 30.Sep, 01.Oct | 108 x 300 s (Santa Susana, Portugal -Bortle 4)
RGB >> 25.Sep, 11.Oct | 240 x 120 s

Original
Final
B

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Trevinca Skies

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Astrometry.net job	6430770
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