Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  NGC 6871  ·  NGC 6883  ·  The star 27Cyg  ·  The star ηCyg
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Sh2-101 Tulip Nebula Bi-Color, 


            John Travis
Sh2-101 Tulip Nebula Bi-Color
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Sh2-101 Tulip Nebula Bi-Color

Technical card

Imaging telescopes or lenses: William Optics RedCat 51 Petzval APO

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Paramount MyT

Guiding telescopes or lenses: William Optics RedCat 51 Petzval APO

Guiding cameras: QHYCCD QHY 5L-II mono

Software: Aries Productions Astro Pixel Processor APP  ·  Software Bisque The SkyX Professional  ·  Adobe Photoshop CC  ·  PHD2 Guiding  ·  Starkeeper Software Voyager  ·  PixInsight 1.8 Ripley

Filters: Baader OIII 8.5nm 1.25"  ·  Baader Planetarium Baader H-Alpha 1,25" 7nm CCD

Accessory: Orion Thin off-axis guider

Dates:July 5, 2019July 6, 2019

Baader Planetarium Baader H-Alpha 1,25" 7nm CCD: 80x180" (gain: 200.00) -15C bin 1x1
Baader OIII 8.5nm 1.25": 80x180" (gain: 200.00) -15C bin 1x1

Integration: 8.0 hours

Darks: ~25

Flats: ~25

Flat darks: ~25

Avg. Moon age: 3.60 days

Avg. Moon phase: 14.24%

Bortle Dark-Sky Scale: 7.00

Basic astrometry details

Astrometry.net job: 2795319

RA center: 20h 5' 52"

DEC center: +34° 59' 31"

Pixel scale: 3.153 arcsec/pixel

Orientation: 314.726 degrees

Field radius: 2.460 degrees

Resolution: 4509x3349

Locations: Home , Huntsville, Alabama, United States

Data source: Backyard


First light with my new WO RedCat 51m. I didn't spend a lot of time on this image because it became evident that there is some tilt and coma going on. The stars look pretty bad in one corner as compared to the opposite corner. Not sure yet if it is the scope or a piece of my equipment? All of my connections are machined threaded parts that I have used with other scopes and they have shown very little to no tilt at all. I have this sinking feeling something might be off with the RedCat. Anyways, next clear night I get I plan to attach only the camera and see if the stars look acceptable. That way I eliminate the OAG, filter wheel and a spacer. Wish me luck! LoL!

Image analysis https://astrob.in/415284/0/