Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  IC 2745  ·  NGC 3628
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NGC 3628 - smiling, really., 



    
        

            Tom Gray
NGC 3628 - smiling, really.
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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.

Technical card

Imaging telescopes or lenses: Meade 2080 SCT 8" LX5

Imaging cameras: Meade DSI 3 Pro

Mounts: Meade Fork mount w/wedge Meade

Guiding telescopes or lenses: Meade 8x50mm Finder/Guider

Guiding cameras: Orion Starshoot autoguider

Focal reducers: 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

Filters: Meade RGB-IR Cut 1.25"

Accessory: Bahtinov Mask  ·  Homemade ST4 autoguider


Dates:March 22, 2021

Frames:
Meade RGB-IR Cut 1.25": 65x120" bin 1x1
Meade RGB-IR Cut 1.25": 17x300" bin 1x1

Integration: 3.6 hours

Flats: ~20

Avg. Moon age: 8.22 days

Avg. Moon phase: 58.81%


Basic astrometry details

Astrometry.net job: 4347066

RA center: 11h 20' 16"

DEC center: +13° 35' 2"

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