Observation by James Weightman: C/2025 A6 Seestar Version

Uploaded by

James Weightman

Observer

James Weightman

Observed

2025 Sep 26 - 03:00

Uploaded

2025 Sep 26 - 06:15

Objects

C/2025 A6

Equipment

ZWO Seestar S50

Exposure

see image

Location

Cirencester, Glos, UK

Target name

Comet C/2025 A6 Lemmon

Title

C/2025 A6 Seestar Version

About this image

A "quick" Alt-Az version.

Files associated with this observation

c2025A620250926jw.jpg (785.1 kB)

Like this image

Steve Knight, Dominic Ford, Alan Dowdell, Brendan Tynan

Comments

Nick James, 2025 Sep 26 - 06:47 UTC

Does the Seestar now automatically stack on the comet's offset motion? That makes imaging comets really easy now. Can you get it to do both, i.e. an offset stack and non-offset? If it could do that and then photometrically calibrate the field it would be really useful for getting magnitude estimates of brigher comets.

Steve Knight, 2025 Sep 26 - 08:52 UTC

Nice image James. No it does not Nick, this morning’s output from Seestar. Currently registering the location of comet and stacking on that. https://share.icloud.com/photos/007YJ1tYknGEvLP98JedUzqKQ

James Weightman, 2025 Sep 26 - 14:24 UTC

My procedure from Alt-AZ in 2 steps:

(1) Register Seestar stacks effectively by reference to background star field to eliminate inter-image field rotation. (old program Registar)

(2) Stack these by reference to comet nucleus, the smooth linear star trails provide a good check on the accuracy of this. (Photoshop)

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