Observation by Michael Buechner, Frank Niebling : 3I Atlas 21th Nov

Uploaded by

Michael Buechner

Observer

Michael Buechner, Frank Niebling

Observed

2025 Nov 21 - 05:11

Uploaded

2025 Nov 21 - 19:25

Objects

0003I

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Constellation

Virgo

Field centre

RA: 12^h31^m
Dec: -02°09'
Position angle: -4°14'

Field size

1°19' × 0°40'

Equipment

TEC 140 f/7 with AP 0.72x Quad Telecompressor f=5
ASI 6200MM; Baader filter L
ASA DM 60, Remote controlled

Exposure

Lum: 8x180s

Location

PixelSkiesAstro, Remote, Spain

Target name

3I Atlas

Title

3I Atlas 21th Nov

About this image

For me, this comet is the surprise of the year. After perihelion, active regions appear to have formed on the nucleus. I have created an insert to show the structure near the comet's head.

Measurements with Tycho Tracker showed a slight decrease in brightness to 10m.2, a coma diameter of 4' and a tail length of 1.1 degrees with PA 293.

Files associated with this observation

C_2025_N1_21112025_6mal180s-_Lum_Ergeb04.jpg (368.7 kB)

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