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Contains:  The star δSge
Getting plate-solving status, please wait...
SH2-84 - Ha Region in Sagitta, 


            Kurt Zeppetello
SH2-84 - Ha Region in Sagitta

SH2-84 - Ha Region in Sagitta

Technical card

Resolution: 4548x3384

Dates:Aug. 30, 2019Sept. 3, 2019Sept. 4, 2019Sept. 7, 2019Sept. 10, 2019

ZWO B 1.25" optimized for ASI1600: 32x90" (gain: 139.00) 10C bin 1x1
ZWO G 1.25" optimized for ASI1600: 31x90" (gain: 139.00) -10C bin 1x1
ZWO Ha 7nm 1.25": 40x180" (gain: 139.00) -10C bin 1x1
ZWO Ha 7nm 1.25": 33x180" (gain: 180.00) bin 1x1
ZWO R 1.25" optimized for ASI1600: 33x90" (gain: 139.00) -10C bin 1x1

Integration: 6.1 hours

Darks: ~12

Flats: ~15

Bias: ~20

Avg. Moon age: 6.12 days

Avg. Moon phase: 41.44%

Bortle Dark-Sky Scale: 5.00

Temperature: 10.00 job: 2920071

RA center: 19h 50' 3"

DEC center: +18° 28' 37"

Pixel scale: 1.203 arcsec/pixel

Orientation: 172.960 degrees

Field radius: 0.947

Locations: Happy Frog Observatory, Monroe, Connecticut, United States

Data source: Backyard


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.

Video made during the capture and processing!
Link to SH2-84 Video

Video made during the capture and processing!
Link to E-Nebula Video



Kurt Zeppetello
License: None (All rights reserved)

Sky plot

Sky plot


SH2-84 - Ha Region in Sagitta, 


            Kurt Zeppetello