Hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  Barnard's Merope Nebula  ·  IC 349  ·  Maia Nebula  ·  Merope Nebula  ·  NGC 1432  ·  NGC 1435  ·  The star Atlas (27Tau)  ·  The star Celaeno (16Tau)  ·  The star Electra (17Tau)  ·  The star Merope (23Tau)  ·  The star Pleione (28Tau)  ·  The star Sterope I (21Tau)  ·  The star Taygeta (19Tau)  ·  The star ηTau
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M45 - dusting off the Pleiades, 



    
        

            Tom Gray
M45 - dusting off the Pleiades
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M45 - dusting off the Pleiades

Getting plate-solving status, please wait...
M45 - dusting off the Pleiades, 



    
        

            Tom Gray
M45 - dusting off the Pleiades
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M45 - dusting off the Pleiades

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 v1.7  ·  Stark Labs Nebulosity v3  ·  PHD2 Guiding V 2.6  ·  Meade Envisage V4.05

Filters: Meade LRGB 1.25"

Accessory: Homemade ST4 autoguider


Dates:Dec. 15, 2020

Frames:Meade LRGB 1.25": 55x120" (1h 50')

Integration: 1h 50'

Flats: ~25

Avg. Moon age: 0.92 days

Avg. Moon phase: 0.95%

Bortle Dark-Sky Scale: 4.00

Mean FWHM: 3.80

Temperature: 3.00


Basic astrometry details

Astrometry.net job: 4089931

RA center: 3h 46' 49"

DEC center: +24° 6' 57"

Pixel scale: 3.988 arcsec/pixel

Orientation: 22.917 degrees

Field radius: 0.918 degrees


Resolution: 1313x1011

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

Data source: Backyard

Description

At last...a decent night with reasonable seeing and coinciding with new moon. My first attempt at the Pleiades, using my new ‘wider-field’ rig, and without the severe vignetting in my previous image.

I am very pleased to have captured the bright reflections as these ‘middle aged’ (at 100m years) stars pass through interstellar dust; at around 400 LY, this is the closest Messier object to earth.

Captured in Envisage, pre-processed and aligned in Nebulosity and processed in Startools 1.7. As ever, any comments and suggestions to improve my processing are welcome. There are some very peculiar anomalies beside the brighter stars (black-grey dashes), which have been reported with the Meade DSI series of cameras; if anyone has a fix, please let me know.

Comments

Revisions

  • Final
    M45 - dusting off the Pleiades, 



    
        

            Tom Gray
    Original
  • M45 - dusting off the Pleiades, 



    
        

            Tom Gray
    B
  • M45 - dusting off the Pleiades, 



    
        

            Tom Gray
    C

B

Description: This version was stacked and aligned in Penumbra v0.6 with gentle HDR brightening and sharpening, improving the contrast, and repair of a few anomalies in Startools v1.6. The original image was heavily over-processed resulting in too much noise! As ever, I welcome your comments and suggestions.

Uploaded: ...

C

Description: Messing in(verted) monochrome

Uploaded: ...

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M45 - dusting off the Pleiades, 



    
        

            Tom Gray