SH2-84 - Ha Region in Sagitta

SH2-84 is a faint emission nebula located approximately 16,300 light years from Earth in the constellation of Sagitta, the Arrow.  It is a member of the Sharpless catalogue of emission nebulae which contains 313 entries representing H-II emission nebulae with a declination of -27 degrees or above, compiled by American astronomer Stewart Sharpless in 1959.  

The nebula is thought to be produced by the bluish star just above the dense red portion in the left center in this image.  It is a Wolf-Rayet star designated as WR128 (HD 187282).  The very difficult to process bright yellow star that dominates the left side of the image is δ-Sge.  SH2-84 lies close to much more impressive object like M27 and M71 which may be why it is not imaged much, in fact there is only one other entry in Astrobin at this time.  

There are several blue, white, yellow, and red stars in this image, however, I suspect many of the stars appear reddish because of the gas and dust in this region.  

SH2-84 - Ha Region in Sagitta

Home Monroe, CT
Date: 8-30-19, 9-3-19, 9-4-19, 9-7-19, 9-10-19
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm
f/7
Focal Reducer: Astro-Tech 0.8x Focal Reducer/Field Flattener for Refractor Telescopes
Mount: Orion Sirius EQ
Filter Wheel: ZWO EFW 8x 1.25"
Filter: ZWO Ha, R, G, B
Focuser: ZWO EAF
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: Ha 73 x 180s, R 33 x 90s, G 31 x 90s, 32 x 90s
Gain: 139
Offset 21
Temp: 17 C
Post Processing: PixInsight, Photoshop
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