Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  B148  ·  B149  ·  B150  ·  B151  ·  B152  ·  B153  ·  B154  ·  B157  ·  B160  ·  B161  ·  B162  ·  B163  ·  B164  ·  B165  ·  B166  ·  B167  ·  B169  ·  B170  ·  B171  ·  B173  ·  B174  ·  B175  ·  B354  ·  B357  ·  B359  ·  B360  ·  B361  ·  B362  ·  B363  ·  B364  ·  And 97 more.
Getting plate-solving status, please wait...
Cepheus in Narrowband, 


            Doug Gray
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Cepheus in Narrowband

Getting plate-solving status, please wait...
Cepheus in Narrowband, 


            Doug Gray
Powered byPixInsight

Cepheus in Narrowband

Imaging telescopes or lenses: Nikon 35mm f1.8

Imaging cameras: ZWO ASI294MM-Pro

Mounts: iOptron CEM70  ·  iOptron Tri-Pier

Guiding telescopes or lenses: SharpStar AL140PH

Guiding cameras: ZWO 290MC

Software: StarNet++  ·  Adobe Photoshop  ·  siril  ·  PHD2 Guiding

Filters: Optolong B 36mm  ·  Optolong G 36mm  ·  Optolong R 36mm  ·  Antlia Ha 3.5nm 36mm  ·  Antlia SII 3.5nm 36mm  ·  Antlia OIII 3.5nm 36mm

Accessory: ZWO EAF  ·  ZWO ASIAir Pro  ·  ZWO EFW 7x36mm

Dates:Aug. 5, 2021Aug. 9, 2021Aug. 10, 2021Aug. 11, 2021Aug. 17, 2021Aug. 28, 2021

Antlia Ha 3.5nm 36mm: 100x300" (8h 20') (gain: 120.00) -10C bin 2x2
Antlia OIII 3.5nm 36mm: 85x600" (14h 10') (gain: 120.00) -10C bin 2x2
Antlia SII 3.5nm 36mm: 30x300" (2h 30') (gain: 120.00) -10C bin 2x2
Optolong B 36mm: 50x30" (25') (gain: 120.00) -10C bin 2x2
Optolong G 36mm: 100x30" (50') (gain: 120.00) -10C bin 2x2
Optolong R 36mm: 56x30" (28') (gain: 120.00) -10C bin 2x2

Integration: 26h 43'

Darks: 30

Flats: 30

Bias: 60

Avg. Moon age: 10.40 days

Avg. Moon phase: 26.99%

Bortle Dark-Sky Scale: 7.00

RA center: 21h58m00s.360

DEC center: +59°2920.69

Pixel scale: 17.433 arcsec/pixel

Orientation: 5.010 degrees (flipped)

Field radius: 15.527 degrees

More info:Open 

Resolution: 4000x5091

Locations: Backyard, Redwood City, CA, United States

Data source: Backyard


Normally I use these widefield shots to pick new targets, but in this case I've already shot most of the main targets in this area like the Elephant's Trunk nebula (IC 1396), Bat and Squid (SH2-129), and Wizard Nebula (SH2-142), with my Z61. This shot is has convinced me to add the Lion Nebula (SH2-132), and a bunch of smaller Sharpless objects to my list.

I've mostly used the SHO palette in the past but I always feel like the result is too green, so I've tried HSO here but done some cross channel mixing in addition to the normal saturation and vibrance adjustments. The result is a bit purple, but I was happy to be able to keep the H regions mostly red. The other caveat is that I've given up on creating accurate flats for this lens after the third try (and will probably retire it for astrophotography as a result), so there was a lot of manual brightness adjustments made for aesthetic purposes. For example, I really wanted the squid nebula to show up here (which is why I shot 16 hours of OIII data), but still needed to adjust that region manually.


Sky plot

Sky plot


Cepheus in Narrowband, 


            Doug Gray