Observation by Nick James: NLC from Chelmsford

Uploaded by

Nick James

Observer

Nick James

Observed

2023 Jun 21 - 01:50

Uploaded

2023 Jun 21 - 06:47

Objects

Noctilucent cloud

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Constellation

Auriga

Field centre

RA: 04^h54^m
Dec: +48°15'
Position angle: -25°12'

Field size

51° × 29°

Equipment

IMX291 + 6mm f/0.95

Exposure

5s stack of video frames

Location

Chelmsford, UK

Target name

NLC

Title

NLC from Chelmsford

About this image

There was a faint, low but extensive display of NLC to my northeast this morning to mark the summer solstice. This is a 5s stack of video frames from my monitoring camera. Capella is the bright star to the right of the TV aerial with Perseus at the top of the frame. NLC activity has been quite low this year and this is the first significant display that I have picked up on this camera.

Files associated with this observation

nlc_20230621_0150_ndj.jpg (153.3 kB)

Like this image

Nick Quinn, Mike Harlow, Callum Potter, Andy Wilson, Peter Carson

Comments

Nick Quinn, 2023 Jun 21 - 07:19 UTC

Nick,

What software do you use to stack the video frames?

Nick James, 2023 Jun 21 - 18:18 UTC

I use ffmpeg to extract frames as sequential 16-bit TIFFs starting at hh:mm:ss and lasting for dur:

ffmpeg -ss hh:mm:ss -t dur -i input -compression_algo raw -pix_fmt rgb48 out%05d.tiff

and then convert (from ImageMagick) to stack the frames:

convert  -evaluate-sequence mean out*tiff res.tif

Nick Quinn

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