2023a3 20250406 dbartlett

C/2023_A3_Tsuchinshan_ATLAS_2025_Apr_06_042632local
 
 
 
Notes:
 
 
 

    Fine evening to catch this ~ 13.5 magnitude comet. 
    Anti-Tail can be seen once again, however faint. 
    Rich starfield in Delphinus. 
    Bright blue planetary nebula NGC6905 , The Blue Flash Nebula, can be found at top right of field. 
    Much dust and gas present in starfield. 

 
I've included the Finson & Probstein (FP) proposed a model describing the full tail geometry so the observer can compare. 
 
 
 
Full resolution link:
https://app.astrobin.com/i/p649uo?r=B
 
 
 
Observational Notes:
scope: C14  fl729mm F/2
Camera: asi6200mcP
image: 38x120sec
Seeing: 4.5/5
Transparency: 9/10 
Observer: DEBartlett
Place: JuneLake California USA (Altitude +2434m)
 
Image Info (all ):
Down sampled 2x2 (CMOS = BIN 2x2)
(All images processed solely using PixInsight)
Projection ............... Gnomonic
Projection origin ........ [1999.537145 1421.963415] px -> [RA: 20 23 43.497  Dec: +19 30 52.99]
Resolution ............... 2.121 arcsec/px
Rotation ................. 0.264 deg
Reference system ......... ICRS
Observation start time ... 2025-04-06 09:26:32 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 00 N  2434 m
Focal distance ........... 731.42 mm
Pixel size ............... 7.52 um
Field of view ............ 2d 21' 23.8" x 1d 40' 32.0"
Image center ............. RA: 20 23 43.497  Dec: +19 30 52.98  ex: -0.041293 px  ey: +0.017540 px
Image bounds:
   top-left .............. RA: 20 28 44.847  Dec: +20 20 22.35  ex: -1.161496 px  ey: -0.907777 px
   top-right ............. RA: 20 18 42.722  Dec: +20 21 12.35  ex: +1.275548 px  ey: -1.162588 px
   bottom-left ........... RA: 20 28 39.718  Dec: +18 40 09.61  ex: -1.337658 px  ey: +0.145287 px
   bottom-right .......... RA: 20 18 43.982  Dec: +18 40 43.66  ex: +2.461229 px  ey: +0.391935 px