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Contains:  Bubble nebula, M 52, M52, NGC 7510, NGC 7538, NGC 7635, NGC 7654, NGC7510, NGC7538, NGC7635, PK110-00.1, PK112-00.1, Sh2-157, Sh2-158, Sh2-159, Sh2-161, Sh2-162
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Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta
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Unrivaled Beauty of Cassiopeia

Technical card

Dates:Aug. 2, 2019Aug. 3, 2019Aug. 23, 2019

ZWO 31mm Ha 7nm: 62x300" (gain: 139.00) -15C bin 1x1
ZWO 31mm OIII 7nm: 78x300" (gain: 139.00) -15C bin 1x1
ZWO 31mm SII 7nm: 79x300" (gain: 139.00) -15C bin 1x1

Integration: 18.2 hours

Darks: ~50

Flats: ~50

Bias: ~200

Avg. Moon age: 8.79 days

Avg. Moon phase: 20.84%

Bortle Dark-Sky Scale: 5.00 job: 2889765

RA center: 23h 18' 6"

DEC center: +60° 45' 39"

Pixel scale: 2.022 arcsec/pixel

Orientation: 90.543 degrees

Field radius: 1.580 degrees

Resolution: 4493x3387

Locations: Home, Batroun, North, Lebanon

Data source: Backyard


This crowded area on the border of Cassiopeia and Cepheus, is home to several nebulae and clusters. Captured over the course of 3 nights in the beginning and end of August and processed using the HST palette, with SII in Red, HA in Green and OIII in Blue.

NGC7538: located about 9,100 light-years from Earth. It is home to the biggest yet discovered protostar which is about 300 times the size of the Solar System

NGC7635: also known as the Bubble Nebula, and distanced about 11,000 light-years. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575. The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.

Messier 52: distance to M52 has not been established with any degree of certainty because of a high interstellar absorption of the cluster’s light. Estimates are generally in the range from 3,000 to 7,000 light years, and it is not physically related to the Bubble nebula.

NGC7510: an open cluster of stars located around 11,400 light years away.

Sh2-157: the Lobster Claw nebula, a weak emission nebula located on the arm of Perseus and approximately 11,000 light-years away from Earth. The nebula spans over a region of 212 light-years.

LBN573: a planetary nebula in the Sh2-157 area

Comments and feedback are much appreciated!

Clear Skies



Michel Makhlouta
License: None (All rights reserved)


  • Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta
  • Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta
  • Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta
  • Final
    Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta


Description: boosted saturation for nebulae


Description: started again from scratch in the hope of improving the stars situation


Description: still trying to get to a version that I am satisfied with

Sky plot

Sky plot


Unrivaled Beauty of Cassiopeia, 


            Michel Makhlouta

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Sharpless2 Objects