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Observation by Dean Ashton: M81

Uploaded by

Dean Ashton

Observer

Dean Ashton

Observed

2021 Feb 03 - 20:00

Uploaded

2021 Feb 06 - 19:07

Objects

M81

Planetarium overlay









Constellation

Ursa Major

Field centre

RA: 09h55m
Dec: +69°04'
Position angle: -4°33'

Field size

0°47' × 0°31'

Equipment
  • Celestron EdgeHD 9.25 + 0.7x focal reducer
  • QHY268C OSC Camera
  • CGE Mount
  • Off-axis dude with Loadstar X2 Guide Camera
  • Optlong L-Pro Filter
Exposure

46x600s @ fl1640mm

Location

St Austell, Cornwall

Target name

M81

Title

M81

About this image

7 hours and 40 minutes total image integration, 46x600s frames, captured on 3rd and 4th February 2021.

M81 still captures the imagination.  Such a classic and beautiful spiral galaxy with conspicuous star forming nebula dotted through the spiral arms.

The image was captured with a QHY268C one-shot-coulr camera and an Optolong L-Pro luminance filter.

Camera TEC set at -20C.  Light frames overscan calibrated for bias: and calibrated with master dark and flat frames.

All image calibration and processing carried out with PixInsight.  SGP was used as the telescope control and image capture software.

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