Observation by Graham Winstanley: M10 in Ophiuchus

Uploaded by

Graham Winstanley

Observer

Graham Winstanley

Observed

2017 Jun 17 - 23:27

Uploaded

2018 Apr 30 - 21:34

Objects

M10

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Constellation

Ophiuchus

Field centre

RA: 16^h57^m
Dec: -04°05'
Position angle: -179°20'

Field size

0°48' × 0°35'

Equipment

Skywatcher ED80
Pier mounted NEQ6
QHY IMG2PRO at -20 deg
oag camera ASI120MM
Baader RGB filters

Exposure

50 x 30s per filter

Location

Bassingham, Lincolnshire

Target name

M10

Title

M10 in Ophiuchus

About this image

This is a reprocess having given up last year when the calibrated frames all came out with white stars and black background with no shades of grey. This time I ignored flats and just used a masterbias. It worked and I was surprised how well. The captures were on 18, 21, 22 and 25 June the shortest nights of the year so the skies were fairly bright.

M10 is about 15,000 light years away and yet spans about two thirds the diameter of the moon. How many stars?

Files associated with this observation

M10 RGB.jpg (892.1 kB)

Like this image

David Swan, Mr Leonard Entwisle, Jeremy Shears, Andy Wilson, Dave Smith, Peter Mulligan, Ron Johnson, Peter Carson, Dean Ashton, Robert James Stuart

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