Project Notes:

Brownish-yellow dust tail reappears, fan-shaped, 3 o'clock and above orbital tail.
Orbital Dust Trail continues to be obvious on individual 240sec subs.
IFN is showing again.
Broad secondary orbital trail continues to be visible (Starless version).
Colorful 12th magnitude globular cluster, PAL 12, upper left side of frame.
Again my brightness measurements through Tycho-Tracker estimates a brightness of mag 7.5! Reminder there are no real comp stars present, individual frame magnitude is 19.1 and the stack is 2.8 hours of this comet.

Observational details:

Backyard setup
2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2
camera: asi6200mmP and asi6200mcP
Seeing: 3/5
Transparency: 7/10
Observer: DEBartlett
Location: June Lake, California, USA

Image Info:

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

Resampled 2x2
Acquisition...............32x240sec total
Resolution ............... 2.504 arcsec/px
Rotation ................. -0.477 deg
Field of view ............ 3d 10' 11.6" x 2d 1' 48.2"
Image center ............. RA: 21 42 37.574 Dec: -21 39 12.07

10P (Tempel 2)

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

10 2026 07 26.43 C 7.5 AG 28.0T 2C600 9.6 26.9m268 ICQ XX BARaeI a240C 9.59mZCP IMX TYT 0 U9*0.52 8.0 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 29.1

COD U66

OBS

CATALOG: ATLAS2 - BAND: g (Sun Mag=-26.46)

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

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

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

10P 26/07/2026 10:24:50 11.36 10.68 10.33 10.08 9.91 9.76 176.5 18.7 U66

10P 26/07/2026 10:24:50* 0.52 0.52 0.52 0.52 0.52 0.52 15 23.3 ATL

AFRHO LOG

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

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

10P 26/07/2026 10:24:50 0.42 1.42 65.66 9.69 176 1103 1087 3.043 U66