Hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  NGC 869  ·  NGC 884  ·  The star 7Per  ·  chi Persei Cluster  ·  h Persei Cluster
Getting plate-solving status, please wait...
NGC 884/869 - a much better fit, 



    
        

            Tom Gray
NGC 884/869 - a much better fit
Powered byPixInsight

NGC 884/869 - a much better fit

Getting plate-solving status, please wait...
NGC 884/869 - a much better fit, 



    
        

            Tom Gray
NGC 884/869 - a much better fit
Powered byPixInsight

NGC 884/869 - a much better fit

Technical card

Imaging telescopes or lenses: William Optics Zenithstar II 80 ED

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 v1.6  ·  Stark Labs Nebulosity v3  ·  Meade Envisage V4.05

Filters: Meade LRGB 1.25"

Accessory: Homemade ST4 autoguider


Dates:Dec. 7, 2020

Frames: 84x30" (42')

Integration: 42'

Avg. Moon age: 21.60 days

Avg. Moon phase: 55.77%


Basic astrometry details

Astrometry.net job: 4069816

RA center: 2h 19' 56"

DEC center: +57° 3' 36"

Pixel scale: 3.918 arcsec/pixel

Orientation: 188.434 degrees

Field radius: 0.893 degrees


Resolution: 1306x993

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

Data source: Backyard

Description

The double cluster in Perseus is a spectacular sight - perhaps visually even more so than digitally, where it sparkles in an already busy star field. It is difficult to fit into a small 2/3 format chip and longer focal lengths, such as my SCT/DSI combo [https://www.astrobin.com/p5rxph/?nc=user]

I'm always looking for ways to reuse/repurpose my exisiting equipment, to maximise value and efficiency. Inspired by various websites, in particular that of the late Jan Timmermans [www.thefirmament.nl/astro], I wanted to see if I could use my Meade SCT focal reducers to maximise the FOV with my Zenithstar II80 ED semi-apo refractor. [Jan clearly inspired many astroimagers, with his enthusiasm, innovation, and his Christian faith, which I share - I dedicate this image to his memory].

On receipt of a new 2" to SCT adapter, I can now achieve a focal length of ~340mm with my Meade 0.33 focal reducer, giving a FOV of just over 1 degree. Although far from pin sharp, careful focusing provides a reasonably flat field with minimal distortion, which I am more than happy with.

This extended FOV will allow me to frame many diffuse nebulae much better and I look forward to trying this out in the coming months. However, without 'goto' or 'pushto' this is going to challenge my star hopping skills! I may look to fit encoders in due course, so I can reuse my ArgoNavis on this setup.

Comments

Revisions

  • Final
    NGC 884/869 - a much better fit, 



    
        

            Tom Gray
    Original
  • NGC 884/869 - a much better fit, 



    
        

            Tom Gray
    B
  • NGC 884/869 - a much better fit, 



    
        

            Tom Gray
    C

B

Description: Here is a picture of the focal reducer combo, attached to my Meade DSI III pro camera, and the component parts. A short 2" push fit to SCT male thread, Meade 0.33 reducer, and very short SCT (female) to T2 (male) which threads into my camera. Using a 15mm extension ring, reduced the focal length further, but resulted in more star distortion at the edge of field.

Uploaded: ...

C

Description: Given the success I am having with stacking in Penumbra - this version was then aligned in Nebulosity with a Keller stretch. Sharper and a bit less saturated, if lacking the detail of the Startools version.

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 884/869 - a much better fit, 



    
        

            Tom Gray