10p 20260717 dbartlett

    Comet is larger, brighter and orbital trail is more defined than July11.

    Lucky moment to have an IFN "hole" centered in the FOV allowing the coma to be on its own.

    NEEDS VERIFICATION! 10P/'s dust tail is viewed as a faint yellowish structure extending along and slightly below the right orbital trail (4 o'clock pos.) Better seen on the inverted color image as a fan-shaped gray blue structure.

    My measurements indicate the comet is brighter than 8th magnitude. No real comparison stars for accuracy though.

Observational details:

    Backyard setup

    2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2

    camera: asi6200mmP and asi6200mcP

    Seeing: 2.5/5

    Transparency: 8/10

    Observer: DEBartlett

    Location: June Lake, California, USA

Image Info:

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

    Resampled 2x2

    Acquisition...............56x240sec total

    Resolution ............... 2.502 arcsec/px

    Rotation ................. -2.684 deg

    Field of view ............ 3d 10' 34.7" x 1d 49' 19.1"

    Image center ............. RA: 21 28 19.137 Dec: -17 21 17.96

    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 16.36 C 7.4 AG 28.0T 2F240 12.6 ICQ XX BARaeI a240C12.60mZCP IMX TYT 0 U9*0.27 9.0 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 32.7