2025f2 20250420 dbartlett

C2025F2SWAN_2025_04_20_050011_local

Notes: 

    C/2025 F2 SWAN in the same field as B And (Mirach). 
    NGC404 "Ghost of Mirach" an elliptical galaxy to the right of Mirach. 
    Condensed nucleus not present. 
    CometAlignment couldn't auto center on centroid. 
    Disintegrating comet obviously fainter than previous night. 
    SpectroPhotometericColorCalibrated (SPCC) color image rendering truest colors. 
    Included highly cropped full resolution comet integrated median combined no rejection integrated comet images for study. 
    Image taken from 4 degrees to 11 degrees off local horizon. 

 
 
 

 
Observational details:
Backyard setup
scope: C14 D = 356mm; fl =729mm; F# 2
camera: asi 6200mcP
exposure: 38 x15 sec
Seeing: 4/5 Transparency: 8/10  Moonlight
Observer: DEBartlett
Location: June Lake, California, USA

Image Info (WideField ):
Down sampled %50
(All images processed solely using PixInsight)
Projection ............... Gnomonic
Projection origin ........ [1766.636532 1121.932901] px -> [RA:  1 11 54.174  Dec: +35 03 02.86]
Resolution ............... 2.136 arcsec/px
Rotation ................. 36.646 deg
Reference system ......... ICRS
Observation start time ... 2025-04-20 11:48:39 UTC
Observation end time ..... 2025-04-20 12:13:02 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 51 N  2434 m
Focal distance ........... 726.13 mm
Pixel size ............... 7.52 um
Field of view ............ 2d 5' 47.0" x 1d 19' 53.5"
Image center ............. RA:  1 11 54.174  Dec: +35 03 02.86  ex: -0.002151 px  ey: +0.003350 px
Image bounds:
   top-left .............. RA:  1 17 56.166  Dec: +34 56 56.80  ex: -1.310027 px  ey: -1.267675 px
   top-right ............. RA:  1 09 40.055  Dec: +36 12 12.55  ex: +0.507798 px  ey: -1.455528 px
   bottom-left ........... RA:  1 14 04.972  Dec: +33 53 34.52  ex: -1.737969 px  ey: +0.975439 px
   bottom-right .......... RA:  1 05 51.755  Dec: +35 07 55.19  ex: +0.287426 px  ey: +0.146532 px

Image Info (Cropped ):
Full Resolution
Projection ............... Gnomonic
Projection origin ........ [1264.872680 962.622614] px -> [RA:  1 14 01.304  Dec: +34 39 45.20]
Resolution ............... 1.067 arcsec/px
Rotation ................. 143.493 deg 
Reference system ......... ICRS
Observation start time ... 2025-04-20 12:00:11 UTC
Observation end time ..... 2025-04-20 12:00:26 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 51 N  2434 m
Focal distance ........... 726.74 mm
Pixel size ............... 3.76 um
Field of view ............ 44' 59.9" x 34' 14.3"
Image center ............. RA:  1 14 01.304  Dec: +34 39 45.20  ex: +0.024022 px  ey: -0.000044 px
Image bounds:
   top-left .............. RA:  1 14 39.503  Dec: +34 12 35.93  ex: -1.348025 px  ey: -1.502079 px
   top-right ............. RA:  1 11 43.639  Dec: +34 39 32.11  ex: +0.856335 px  ey: -1.734407 px
   bottom-left ........... RA:  1 16 18.673  Dec: +34 39 49.72  ex: -1.259567 px  ey: +0.352539 px
   bottom-right .......... RA:  1 13 22.557  Dec: +35 06 57.77  ex: -0.059437 px  ey: +0.242033 px
   
_._,_._,_