2022 Michael A. Siniscalchi

What's New



Odds n Ends

         NGC 6755 / NGC 6756
            Open Clusters in  Aquila
         NGC6755-  RA:19h 07m 49s  Dec: +04 10' 30" Distance - ~4625 ly Size 18'x18'
            NGC6756-  RA:19n 08m 42s  Dec: +04 42' 18" Distance-  ~4915 ly Size  5.7'x5.7'

Location & Date
Backyard, Abbott Observatory- Long Island, NY,  June 2022
Orion ED80 F/7 APO, Moonlite focuser, iOptron GEM45G, Pegasus Falcon rotator
Image scale 2.54 arcsec/pixel
Baader  L R G B  filters
CCD temp -15C
  L- 15 x 3m  Red- 15 x 3m  Green - 15 x 3m  Blue- 15 x 3m  Bin 1x1
Planning & Acquisition
Sequence Generator Pro

Astro Pixel Processor -  Calibration, Normalize, Alignment,  RGB combine, star color balance
Adobe PS -  L+RGB combine, Noise reduction, JPEG conversion
RC-Astro Star XTerminator


  NGC 6755 is an open cluster of stars in the equatorial constellation of Aquila, positioned about 3 to the east of the star Delta Aquilae. It was discovered by the Anglo-German astronomer William Herschel on July 30, 1785. Located at a distance of 8,060 light years from the Sun, it lies 30' to the northeast of the smaller cluster NGC 6756 ( top left), with the pair forming a visual double cluster. However, they probably do not form a binary cluster system since they have different ages and are too distant from each other.

  This cluster has a Trumpler class of II2r with a visual magnitude of 7.5 and it spans an angular size 15'. It has an estimated age of 250 million years, based on the main sequence turnoff. A total of 71 variable stars have been detected in the field of this cluster, of which 31 are eclipsing binaries, seven are pulsating variables, and 28 are most likely irregular variable red giants.

Click on image for full size.
NGC 6755 position shown relative to our location (Sun) in the Milky Way Galaxy
Age: 52 million years
Galatic Longitude: 38.6
Galatic Latitude: -1.7
Distance from Galatic Plane:81 ly below the galatic plane

Above image and info provided by Our Galaxy 3D Atlas application and used with permission by Otherwise