2023a3 20241014 dbartlett

C2023_A3_Tsuchinshan_ATLAS_RAASA8_ASI6200mcP_25x10sec_2024_10_13_192512local_OhRidge_California_USA_DEBartlett
 
 
 
From last night...Finally some darker skies to catch comet C/2023 A3 Tsuchinshan - ATLAS from 38 degrees North Latitude.  A little over six minutes  was used in this moderately close in (BIN2x2) view yet a 5 x 3 degree field to see the comet.  SpectroPhotoMetricColorCalibration process in PixInsight was used to calibrate the star colors leading to a red/orange appearance of the comet.  We're all dealing with both heavy twilight and moonlight viewing this comet.  The bright conditions are wreaking havoc on the gradients instilled in the fast F/2 RASA system.  It will be interesting to see what tonight will bring with similar setup and a few more degrees of altitude, darkness and moonlight.
 
 
Remote setup
scope: RASA8  fl400mm D203mm
exposure: 25 x 10 sec 
Seeing: 4/5
Transparency: 9/10
Observer: DEBartlett
Place: Oh! Ridge_California USA (Altitude +7800ft)
 
Image Info (Cropped_Processed ):
(All images processed solely using PixInsight)
Projection ............... Gnomonic
Projection origin ........ [2316.909963 1402.575877] px -> [RA: 14 45 31.610  Dec:  +0 18 36.54]
Resolution ............... 3.851 arcsec/px
Rotation ................. -0.293 deg
Reference system ......... ICRS
Observation start time ... 2024-10-14 02:25:18 UTC
Focal distance ........... 402.82 mm
Pixel size ............... 7.52 um
Field of view ............ 4d 57' 23.8" x 3d 0' 4.9"
Image center ............. RA: 14 45 31.610  Dec:  +0 18 36.53  ex: -0.000865 px  ey: -0.001381 px
Image bounds:
   top-left .............. RA: 14 55 22.986  Dec:  +1 49 16.27  ex: -1.108678 px  ey: -1.190626 px
   top-right ............. RA: 14 35 35.693  Dec:  +1 46 56.04  ex: +0.296372 px  ey: -1.104713 px
   bottom-left ........... RA: 14 55 25.192  Dec:  -1 09 45.72  ex: -1.105364 px  ey: +0.442057 px
   bottom-right .......... RA: 14 35 36.110  Dec:  -1 12 50.50  ex: +0.006996 px  ey: +0.440479 px