2025f2 20250421 dbartlett

 
C/2025 F2 SWAN 2025_April_21_045819local
 
 
 
Notes:
 
 
 

    Comet aligned w stars  
    Integrated w median combination  
    No rejection & Full resolution @ highly cropped. 
    SPCC color calibrated for truest color in non inverted images. 
    Nuclear region with lack of consentration. 
    Imaged from 3 degrees to 10 degrees above local horizon. 

 
 
 

 
 
 
Observational details:
Backyard setup
scope: C14 D = 356mm; fl =729mm; F# 2
camera: asi 6200mcP
exposure: 30 x15 sec
Seeing: 4/5 Transparency: 8/10 Seeing - Moonlight
Observer: DEBartlett
Location: June Lake, California, USA
 

Image Info (Cropped Closeup ):
Projection ............... Gnomonic
Projection origin ........ [1273.271790 970.790453] px -> [RA:  1 25 57.445  Dec: +34 53 22.15]
Resolution ............... 1.070 arcsec/px
Rotation ................. 36.951 deg
Reference system ......... ICRS
Observation start time ... 2025-04-21 11:49:30 UTC
Observation end time ..... 2025-04-21 12:04:48 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 51 N  2434 m
Focal distance ........... 724.65 mm
Pixel size ............... 3.76 um
Field of view ............ 45' 24.9" x 34' 37.4"
Image center ............. RA:  1 25 57.445  Dec: +34 53 22.14  ex: -0.008083 px  ey: +0.007627 px
Image bounds:
   top-left .............. RA:  1 28 16.582  Dec: +34 53 28.03  ex: -1.105999 px  ey: -1.097837 px
   top-right ............. RA:  1 25 17.599  Dec: +35 20 50.19  ex: +0.400190 px  ey: -1.698673 px
   bottom-left ........... RA:  1 26 36.733  Dec: +34 25 54.97  ex: -1.683461 px  ey: +1.037237 px
   bottom-right .......... RA:  1 23 38.108  Dec: +34 53 06.78  ex: +0.033824 px  ey: +0.267342 px
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