Hemisphere:  Southern  ·  Constellation: Serpens (Ser)  ·  Contains:  Eagle nebula  ·  IC 4701  ·  M 16  ·  M 17  ·  M 18  ·  NGC 6604  ·  NGC 6611  ·  NGC 6613  ·  NGC 6618  ·  Omega nebula
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sh2-54, M16 and M17, 


            Yuichi Kawamoto
sh2-54, M16 and M17
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sh2-54, M16 and M17

Technical card

Imaging telescopes or lenses: Borg 55FL  ·  BORG 67FL

Imaging cameras: QHYCCD QHY16200A Mono  ·  Canon KissX4

Mounts: CEM60

Guiding telescopes or lenses: Takahashi GT-40

Guiding cameras: QHYCCD QHY 5L-II mono

Focal reducers: BORG Reducer 0.8x DGQ55 [7880]

Software: Photoshop CC  ·  Astroplace.net APT  ·  PixInsight 1.8


Dates:Aug. 8, 2016

Frames: 25x300"

Integration: 2.1 hours

Avg. Moon age: 5.37 days

Avg. Moon phase: 29.25%

Basic astrometry details

Astrometry.net job: 1209382

RA center: 18h 19' 26"

DEC center: -14° 32' 2"

Pixel scale: 3.619 arcsec/pixel

Orientation: -179.909 degrees

Field radius: 4.046 degrees

Resolution: 1079x1655

Locations: Shirabiso Highland, Iida City, Nagano Prefecture, Japan


The two major diffuse nebulae M16 "Eagle Nabula" and M17 "Omega Nabula," and surrounding area are captured in a mosaic composition of two panels taken by QHYCCD's new APS-H size cooled CCD camera QHY16200A. Especially, Sharpless 54, located in the north of the major nebulae, attracted me with its subtle color undulation behind cloud of stars. Also, see the color contrast of the remarkable blue star on the left and sh2-54 the right. This star is at the center of the cluster NGC6625 and has magnitude of 5.69, but apparently does not have any unique name.

Processing Note:

All processes were in PixInsight. RGB frames from DSLR were integrated with BayerDrizzle, and composite with LRGBComposition. Mosaic was processed with GradientMergeMosaic with helps of template creation by CatalogStarGenerator script to correct distortion. Post process includes compression and local contrast enhancement with HDRMultiscaleTransform and LocalHistgramEqualization as well as conventional nonlinear techniques such as CurveTransformation. Deconvolution was employed only for B channel to eliminate influence of chromatic aberration Borg 55FL has.

Detailed acquisition information is as follows:

[Exposure Time]
L Images:
2016/8/8 21:33-23:50
300 secs x 25 frames, total exposure 125 minutes

RGB Images:
2016/8/8 21:30-23:49
140 secs x 48 frames, total exposure 112 minutes

Total exposure time: 237 minutes

Equipment for L:
Borg 67FL + 7108 reducer, fl324mm F4.8
QHYCCD QHY16200A mono, -13 degrees Celsius

Equipment for RGB:
Borg 55FL + 7880 reducer, fl200mm F3.6
Cannon EOS Kiss X4 (IR modified), ISO1600

Common Equipment:
Mount: iOptron CEM60
Guiding Telescope: Takahashi GT-40
Guiding Camera: QHYCCD QHY-5IIL

Capturing Software: APT Version 3.12
Guiding Software: PHD2 Version 2.61

Processing Software: PixInsight
Photoshop CC

L images for the LRGB was composition of images with cooled CCD Camera QHY16200A, while RGB images were from DSLR EOS Kiss X4.



  • sh2-54, M16 and M17, 


            Yuichi Kawamoto
  • sh2-54, M16 and M17, 


            Yuichi Kawamoto
  • sh2-54, M16 and M17, 


            Yuichi Kawamoto
  • sh2-54, M16 and M17, 


            Yuichi Kawamoto
  • Final
    sh2-54, M16 and M17, 


            Yuichi Kawamoto

Sky plot

Sky plot


sh2-54, M16 and M17, 


            Yuichi Kawamoto