Tag: HOO

NGC 6888 Crescent nebula

The Crescent nebula is an HII region in the constellation Cygnus. I photographed this deep-space object before with a relatively long focal length. The Crescent nebula is not the only nebula in the constellation Cygnus. In fact, this constellation is overpopulated with either emission or planetary nebulae. This is the reason why I picked a shorter focal length than before (wider field of view), positioned the Crescent nebula in the corner of the CMOS chip, and let the photos be collected for 3 subsequent nights. In total, I exposed 153 photos, each 5 minutes long. This means nearly 13 hours of integration time, which makes it one of the longest total exposure I spent on a single deep-space image.

Hubble palette image (SHO):

Bi-color image (HOO):

TelescopeSharpstar 94EDPH
Aperture94 mm
Focal length414 mm
MountRainbow Astro RST 135
AutoguidingZWO 174MM, QHY Mini Guide Scope
CameraZWO 2600MM @-10°C
CorrectorF4.4 Quad Reducer
FiltersAntlia Ha, OIII, SII 3 nm
Exposure153x300s, Gain 100, bin 1×1,

NGC6960 NGC6992 Veil nebula mosaic

Here is another picture of my favorite Veil nebula. The first attempt here with a long focal length (1000 mm), the second attempt here with a shorter focal length (730 mm), and finally third here with the shortest focal length I have (430 mm). Still, I haven’t captured everything of the nebula last year and this year I focused my smallest telescope on the western part of the Veil nebula and created a mosaic.

The picture, as well as the previous ones, are bi-color images. I captured hydrogen alpha (Ha) and oxygen III (OIII) narrow band images and inserted the Ha image into the red channel and OIII into the green and blue channels.

Telescope:Newton 150/600 mm
Aperture:150 mm
Focal length:438 mm
Mount:Gemini G53f
Autoguiding:ZWO 174MM, TS 60/240 mm
Camera:Moravian instruments G2 8300M @ -30C
Corrector:ASA 2″ reducer 0.73
Filters:Baader Ha 7 nm, OIII 8.5 nm SII 8nm
Exposure:30x Ha, 30x OIII, 600 s, bin 1×1