Observation by Tim Haymes: C2025 A6 Lemmon

Uploaded by

Tim Haymes

Observer

Tim Haymes

Observed

2025 Oct 21 - 19:00

Uploaded

2025 Oct 22 - 09:44

Objects

C/2025 A6

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Constellation

Bootes

Field centre

RA: 14^h36^m
Dec: +30°00'
Position angle: +40°44'

Field size

12° × 8°

Equipment

Canon 70D
Sigma 105mm F2.8
Polarie tracker

Exposure

18 x 15s stack, iso-800 at F2.8

Location

North Oxfordshire

Target name

Comet Lemmon C/2025A6

Title

C2025 A6 Lemmon

About this image

A real comet ! In 10x50bs defocused rough estimate is mag 4.5 (sigma Boo). Not seen with my naked eye. Sky not quite clear enough (thin cloud). Dust tail traced out to rho Boo.
Blue ion tail in stacked images - very impressive - goes beyond the frame edge (at least 6 degrees) Frame is 8 x 12 degrees.

Canon RAW with dark and bias frames, stacked in DSS (not on comet), saved as FITS and processed in AstroArt. Saved as jpg with increased colour saturation.

Files associated with this observation

C2025A6_20251021_1858_thaymes.jpg (1.1 MB)

Like this image

Callum Potter, Dominic Ford

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