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Contains:  M 65, M 66, NGC 3623, NGC 3627, NGC 3628
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Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
Leo Triplet - Ha LRGB
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Technical card


Dates:April 3, 2019

Frames:
Baader Blue 36 mm: 16x600" bin 1x1
Baader Green 36 mm: 14x600" bin 1x1
Baader Luminance 36 mm: 24x600" bin 1x1
Baader Red 36 mm: 16x600" bin 1x1
Chroma Ha 3nm: 8x1200" bin 1x1

Integration: 14.3 hours

Avg. Moon age: 27.81 days

Avg. Moon phase: 3.32%


Basic astrometry details

Astrometry.net job: 3184463

RA center: 11h 19' 48"

DEC center: +13° 17' 56"

Pixel scale: 1.120 arcsec/pixel

Orientation: 89.542 degrees

Field radius: 0.704 degrees


Resolution: 3543x2813

Locations: Home Observatory, Doncaster, Nottinghamshire, United Kingdom

Data source: Backyard

Description

The ‘Leo Triplet’ consists of Messier 65, Messier 66 and NGC 3628 – galaxies located around 30-35 million light years from Earth. Stretching out from NGC 3628 for around 300,000 light years is a ‘tidal tail’ – an elongated region of stars that arises as a result of gravitational interaction between galaxies.

This object was imaged from our home observatory in Spring of 2019. We had hoped to collect a bit more data, but ran out of time due to adverse weather. Data collection took place between 25 March and 3 April 2019.

The tidal tail proved somewhat elusive, but is present lower left. We decided to shoot a small number of Ha subs. There was a little Ha signal present, and this was most prominent in Messier 66 (NGC 3627).

Ha: 8 x 1200s
Lum: 24 x 600s
Red: 16 x 600s
Green: 14 x 600s
Blue: 16 x 600s

A total of 14 hours and 20 minutes exposure.

Capture: Steve & Lis Milne
Processing: Steve Milne

Comments

Author

gnomus
Steve Milne
License: None (All rights reserved)
3624
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Revisions

  • Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
    Original
  • Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
    B
  • Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
    C
  • Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
    D
  • Final
    Leo Triplet - Ha LRGB, 



    
        

            Steve Milne
    E

B

Description: Some colour tweaks.

C

Description: Apologies - some minor star work

D

Description: Bit more work on tidal tail. Apologies for multiple revisions this morning.

Sky plot

Sky plot

Histogram

Leo Triplet - Ha LRGB, 



    
        

            Steve Milne