Observation by Peter Anderson: Jewelbox Open Cluster

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Peter Anderson


Peter Anderson


2020 Mar 15 - 00:00


2020 Mar 25 - 01:02


The Jewel Box (NGC4755)

Planetarium overlay



Field centre

RA: 12h53m
Dec: -60°20'
Position angle: +1°52'

Field size

0°42' × 1°04'

  • 150mm F8 Skywatcher ED

3200 ISO 15secs


Brisbane Australia

Target name

Jewelbox open cluster


Jewelbox Open Cluster

About this image

This exposure with the ED telescope is one quarter the length of the image with the standard achromat, so a direct comparison is not appropriate.

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Graham Winstanley
Graham Winstanley, 2020 Mar 25 - 08:22 UTC

Hi Peter,

Your new scope is looking great and performing superbly.

I think your jewels have a dose of the magentas. It is a problem I often have with the stars using a DSLR but have recently found a neat trick to fix it in pixinsight. On the colour image use process - invert, then process - scnr green at 100 percent. Then invert back again. There is probably a similar way to do it in Photoshop but I am not fluent in that language.

Best regards, Graham

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