NGC 6559

Imax=4 Imax=2 Imax=1 (2100s)

ST-4000XCM, 600s total exposure 7/9/13 Adin, CA

This target was an attempt to get off the beaten path a bit, and was chosen somewhat randomly off the star chart without knowing what to expect. This area of emission and reflection nebulae is located rather close to the Lagoon nebula in Sagittarius. For some reason the wind was really blowing the telescope around during these exposures, and only the first two 5-minute frames were even half-decent. The intensity scalings 2 and 4 above use only the first two frames, while scaling 1 uses all 7 frames.

NGC 6559

Imax=1 Imax=2

SBIG ST-4K, 4500s total exposure 7/22/17 Monte Bello, CA

Here is another attempt at this interesting emission nebula in Sagittarius. This version has improved sharpness, since there were no wind problems, but the background is somewhat uneven due to the relatively bright sky at Monte Bello.