Observation by Dean Ashton OBE: NGC6888

Uploaded by

Dean Ashton OBE

Observer

Dean Ashton OBE

Observed

2026 Jul 18 - 23:00

Uploaded

2026 Jul 21 - 14:03

Objects

The Crescent Nebula (NGC6888)

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Constellation

Cygnus

Field centre

RA: 20^h12^m
Dec: +38°20'
Position angle: +1°27'

Field size

0°45' × 0°29'

Equipment

Celestron 9.25 EHD
QHY268C Camera
Optolong L-eXtreme Filter

Exposure

99x600s

Location

St Austell, Cornwall

Title

NGC6888

About this image

This nebula is a favourite subject. It has taken three years of short summer nights to accumulate 16.5 hours of total integration used to create this image. Recent developments in PixInsight, particularly the Multiscale All Sky Reference (MARS) database for accurate light gradient correction of Ha and Oiii data, has enabled the precise visualisation of the faint Oiii signal that appears to encircle the Ha of NGC6888.

In this image, the stars have been spectrophotometrically colour calibrated, while the nebulosity is shown with an HO-Forax palette.

Files associated with this observation

NGC6888_99x600s_HO_Foraax.jpg (4.7 MB)

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