Observation by Nick James: C/2025 A6 (Lemmon)

Uploaded by

Nick James

Observer

Nick James

Observed

2025 Oct 09 - 04:00

Uploaded

2025 Oct 09 - 06:16

Objects

C/2025 A3

Equipment

ASI6200MM + Celestron HD11

Exposure

17x10x30

Location

Chelmsford

Target name

C/2025 A6 (Lemmon)

Title

C/2025 A6 (Lemmon)

About this image

A quick animation from this morning showing rapid motion in the ion tail. The comet is now moving at almost 6 arcsec/min so these are 30s exposures. Each of the 17 frames is a stack of 10 subframes stacked on the comet's motion. A prominent kink in the tail is moving away from the head.

At some point I need to sit down and do a calibrated version of this since the background is not very flat due to the Moon. This output comes directly from a software processing chain that doesn't involve any input from me. It takes around 5 minutes to make this movie from the 170 input frames. There is a lot going on in the head too and I'll post a movie of that using a Larsen-Sekanina filter later today.

Files associated with this observation

2025a6_20251009_0400_ndj.gif (8.4 MB)

Like this image

Andy Wilson, Mike Foulkes, Nick Quinn, Dominic Ford, Callum Wingrove, Pierre Vandevenne, Steve Knight, Paul Whitmarsh, Nicholas Freeman, Honor Wheeler, Martina McGovern

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