2025f2 20250409 dbartlett

C2025_F2_SWAN_C14F2_asi6200mcP_17x30sec2025_04_09_051735local_JuneLake_California_USA_DEBartlett
 
 
 
Notes:
 

    Aargh - Auto-window update limited combined capture to 8.5minutes 
    Moonset 13 minutes prior to comet aligned reference 
    Nuclear region looked smaller than April 6th although seeing conditions were very good 
    Elongated tail quite dynamic with bluish plasma seen only closest to the coma. 
    Last image session until interference of moonlight lessens or comet improves  

 
Full resolution link:
https://app.astrobin.com/i/uaq0i6?r=B
 
 
 
Observational Notes:
scope: C14  fl729mm F/2
Camera: asi6200mcP
image: 17x30sec
Seeing: 3.5/5
Transparency: 7.5/10 
Observer: DEBartlett
Place: JuneLake California USA (Altitude +2357m)
 
Image Info (all ):
Down sampled 2x2 (CMOS = BIN 2x2)
(All images processed solely using PixInsight)
Projection ............... Gnomonic
Projection origin ........ [1829.203899 1266.186116] px -> [RA: 23 41 22.044  Dec: +27 53 29.00]
Resolution ............... 2.128 arcsec/px
Rotation ................. 1.375 deg
Reference system ......... ICRS
Observation start time ... 2025-04-09 12:11:37 UTC
Observation end time ..... 2025-04-09 12:27:31 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 51 N  2434 m
Focal distance ........... 728.84 mm
Pixel size ............... 7.52 um
Field of view ............ 2d 9' 44.9" x 1d 29' 50.7"
Image center ............. RA: 23 41 22.044  Dec: +27 53 29.02  ex: -0.000976 px  ey: -0.029680 px
Image bounds:
   top-left .............. RA: 23 46 21.500  Dec: +28 36 14.18  ex: -1.484773 px  ey: -1.021667 px
   top-right ............. RA: 23 36 32.191  Dec: +28 39 23.78  ex: +0.016267 px  ey: -1.120891 px
   bottom-left ........... RA: 23 46 08.677  Dec: +27 06 42.64  ex: -1.103235 px  ey: +0.248315 px
   bottom-right .......... RA: 23 36 26.780  Dec: +27 09 58.85  ex: -0.014706 px  ey: +0.238424 px
   
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