Observation by Dean Ashton: M101 enhanced using a duo-band filter wi...

Uploaded by

Dean Ashton OBE

Observer

Dean Ashton

Observed

2020 Mar 24 - 21:00

Uploaded

2020 Apr 20 - 07:35

Objects

M101

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Constellation

Ursa Major

Field centre

RA: 14^h03^m
Dec: +54°21'
Position angle: -2°55'

Field size

0°36' × 0°26'

Equipment

Celestron 9.25 EdgeHD with 0.7x focal reducer
Celestron Nightscape 10100 OSC Camera
CGEM
Off-axis guiding with LoadstarX2 Guide Camera
Optolong L-Pro and L-eNhance filters

Exposure

/f7; 75x600s with L-Pro filter: 30x600s with :-eNhance filter; 1x1-binning; total integration time was 17-hours and 30-minutes.

Location

St Austell, Cornwall UK

Target name

M101

Title

M101 enhanced using a duo-band filter with a OSC camera.

About this image

I had previously posted this image of M101 taken with 75x600s light frames captured on the 15th, 23rd, 24th and 25th March with an Optolong L-Pro filter. I have now added a further 30x600s light frames taken on the 15th and 26th March with an Optolong L-eNhance filter. The difference is a significant enhancement of the red hydrogen-alpha regions in the galaxy.

The L-eNhance filter allows transmission at the wavelengths of Ha, Hb and Oiii. It brings narrow band possibilities for the one-shot-colour camera user. In this image 75% of the frames were shot with the L-Pro (luminous) filter and 25% with the L-eNhance (narrow band) filter).

Files associated with this observation

M101_March2020_235mmEdgeHDf7_102x600s_March20_DAshton.jpg (1.9 MB)

Like this image

Jeremy Shears, Andy Wilson, David Basey, Ray Emery, Graham Winstanley, Mr John William Hughes, Lyn Smith, Andrew Dumbleton

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