Project Notes:

115×120 seconds of integration time.
Heavily processed to bring out hints of the blue plasma tail.
Yellow dust anti-tail appears easier to see.
Starlike false nucleus.
Animation and be found here https://app.astrobin.com/i/991zqj
Heavily saturated color although color calibrated using SPCC.

Observational details:

Backyard setup
scope: C14 D = 356mm; fl =729mm; F# 2
camera: asi 6200mcP
Seeing: 4/5
Transparency: 9/10
Observer: DEBartlett
Location: June Lake, California, USA

Image Info (all ):

All images sampled 2x2 (CMOS = BIN 2x2)

(All images processed solely using PixInsight and Comet Photometery Tycho-Tracker)

Acquisition................115x120seconds
Resolution ............... 2.127 arcsec/px
Rotation ................. -4.157 deg
Field of view ............ 1d 33' 50.6" x 1d 6' 43.3"
Image center ............. RA: 11 03 31.921 Dec: +5 38 58.83

C/2025 N1 (ATL📷 3I ATLAS ImageViewr.pngAS)

ICQ line:

IIIYYYYMnL YYYY MM DD.DD eM/mm.m:r AAA.ATF/xxxx /dd.ddnDC /t.ttmANG ICQ XX*OBSxxf InT APERTURcamchip SFW C ## u.uu xx.x PIXELSIZE

2025N1 2025 12 15.38 C 10.0 AR 36.0T 2N640 4.9 26.1m103 ICQ XX BAR I a600C 4.90mZCP IMX TYT 0 U9*0.16 10.0 2.1s 2.1 Location: JuneLakeBirdHouse (MPC XXX); Comment: Comet Alt. 47.7

COD XXX

OBS

CATALOG: ATLAS2 - BAND: r (Sun Mag=-26.93)

10x10 20x20 30x30 40x40 50x50 60x60 RSR FC COD

COMET UTC +/- +/- +/- +/- +/- +/- N FWHM CAT

------------ ------------------- ----- ----- ----- ----- ----- ----- ---- ---- ---

C/2025 N1 15/12/2025 09:03:43 12.99 12.22 11.83 11.54 11.32 11.17 84.1 18.5 XXX

C/2025 N1 15/12/2025 09:03:43* 0.15 0.15 0.15 0.15 0.15 0.15 122 15.4 ATL

AFRHO LOG

COMET UTC DELTA r AP " MAG RSR CM +/- AFRHO OBS

------------ ------------------- ----- ----- ----- ----- --- ----- ---- ----- ---

C/2025 N1 15/12/2025 09:03:43 1.80 2.18 15.29 12.49 84 2346 651 3.370 XXX

📷 3I ATLAS AFRHO.png