Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5272
Messier 3, 


            Victor Van Puyenbroeck
Messier 3
Powered byPixInsight
Messier 3, 


            Victor Van Puyenbroeck
Messier 3
Powered byPixInsight

Technical card

Imaging telescopes or lenses: Teleskop Service Triplet FPL-53 APO 80/480

Imaging cameras: Canon 450D

Mounts: SkyWatcher EQ5 Pro Synscan

Guiding telescopes or lenses: APM Mini Guiding Scope 50 mm

Guiding cameras: ZWO ASI120MM

Focal reducers: TS-Optics 2" PHOTOLINE 0.79x Reducer / corrector

Software: Backyard EOS  ·  PHD2  ·  PixInsight

Filters: Baader 2" UV/IR-Cut/L

Accessory: Tracer 7 Ah LiFePO4 battery

Dates:March 28, 2017May 19, 2018

27x60" (27') ISO800
ZWO L 31 mm: 85x60" (1h 25') (gain: 74.00) -15C bin 1x1

Integration: 1h 52'

Darks: ~60

Flats: ~20

Flat darks: ~100

Bias: ~20

Avg. Moon age: 2.46 days

Avg. Moon phase: 10.71%

Bortle Dark-Sky Scale: 8.00

Temperature: 12.00

Basic astrometry details

Astrometry.net job: 2068975

RA center: 13h 41' 51"

DEC center: +28° 18' 25"

Pixel scale: 2.016 arcsec/pixel

Orientation: 92.303 degrees

Field radius: 0.839 degrees

Resolution: 2136x2104

Data source: Backyard


Update 21/05/2018: Added luminance data from my ASI1600MM-C camera to the DSLR color data from 2017. Sharpness is greatly improved with the new camera!

Total exposure is:
- 85 minutes luminance (ASI1600MM) from Bortle 9.
- 27 minutes color (DSLR) from Bortle 7.

Messier 3 is a bright globular cluster in the constellation Canes Venatici, made up of about 0.5 million stars and located outside of the galactic plane.

Despite the fact that globular clusters only contain one kind of object (stars), obtaining good detail in the core and extended outer areas is challenging.

This is one of my first autoguided photographs, obtained out in the field.
I definitely noticed how the stars are tighter now, and mainly focused on star definition and color during post-processing.

While framing M3, I decided to include the small spiral galaxy NGC 5263 near the top.
Best viewed at full size.

Full report of the imaging session:



  • Messier 3, 


            Victor Van Puyenbroeck
  • Final
    Messier 3, 


            Victor Van Puyenbroeck


Description: LRGB with luminance data from my ASI1600MM and color data from my DSLR

Uploaded: ...

Sky plot

Sky plot


Messier 3, 


            Victor Van Puyenbroeck