Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  IC 2745  ·  NGC 3628
Getting plate-solving status, please wait...
NGC 3628 - smiling, really., 



    
        

            Tom Gray
NGC 3628 - smiling, really.
Powered byPixInsight

NGC 3628 - smiling, really.

Getting plate-solving status, please wait...
NGC 3628 - smiling, really., 



    
        

            Tom Gray
NGC 3628 - smiling, really.
Powered byPixInsight

NGC 3628 - smiling, really.

Equipment

Imaging Telescopes Or Lenses
Meade 2080 SCT 8" LX5
Imaging Cameras
Meade DSI 3 Pro
Mounts
Meade Fork mount w/wedge Meade
Filters
Meade RGB-IR Cut 1.25"
Accessories
Bahtinov Mask · Homemade ST4 autoguider · Meade f3.3 focal reducer/field flattener Meade Focal reducer
Software
SiliconFields / Ivo Jager Startools v1.7 · Stark Labs Nebulosity v3 · PHD2 Guiding V 2.6 · Meade Envisage V4.10
Guiding Telescopes Or Lenses
Meade 8x50mm Finder/Guider
Guiding Cameras
Orion Starshoot autoguider

Acquisition details

Dates:
March 22, 2021
Frames:
Meade RGB-IR Cut 1.25": 65x120" (2h 10') bin 1x1
Meade RGB-IR Cut 1.25": 17x300" (1h 25') bin 1x1
Integration:
3h 35'
Flats:
20
Avg. Moon age:
8.22 days
Avg. Moon phase:
58.81%

Basic astrometry details

Astrometry.net job: 4347066

RA center: 11h20m16s.3

DEC center: +13°3502

Pixel scale: 1.756 arcsec/pixel

Orientation: 357.319 degrees

Field radius: 0.407 degrees

Resolution: 1344x989

Locations: Home 'observatory' (Bortle 5), Derbyshire, United Kingdom

Data source: Backyard

Description

NGC 3628 an ‘end on’ spiral galaxy is about 100,000 LY across and 30m LY away in the Leo I group. A strong dust lane bisects the galaxy, and longer exposures are required to show the 300,000 LY tidal tail.

This image was something of a ‘comedy of errors’, with poor tracking in PHD. Despite a reasonable polar alignment, the guider kept driving the mount North after about 15 minutes - suspecting a slipping DEC motor, malfunctioning connection or relay in my homemade autoguider, I restarted the image three times, before realising that I had not changed the PHD profile from my LX6 smart drive mount! I ran out of time to take more colour subs.

There is significant vignetting in my 8” SCT operating at f3 - this is the best I could do with rather noisy data and I had difficulty subtracting flats, leaving artefacts. I am reasonably happy with the final image, which is an improvement on previous efforts; at least I have something to smile about.

Comments

Revisions

  • NGC 3628 - smiling, really., 



    
        

            Tom Gray
    Original
  • NGC 3628 - smiling, really., 



    
        

            Tom Gray
    B
  • Final
    NGC 3628 - smiling, really., 



    
        

            Tom Gray
    C

B

Description: A 'rough and ready' colour image - at least R and B data (the green data was very noisy (moonlight?). Data were collected binned 2x2 and comprise 17m R and 12m B. I let Startools interpolate the green channel, and used various tools to suppress background noise and gradients.

Uploaded: ...

C

Description: Reduced saturation to provide a more ‘natural’ looking colour

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 3628 - smiling, really., 



    
        

            Tom Gray