2023a3 20241029 dbartlett

C2023_A3_Tsuchinshan_ATLAS_RASA11_asi6200mcP_3xPanelMosaic_35x60sec_29x60sec_20x60sec_024_10C_2024_10_28_194403local_JuneLake_California_USA_DEBartlett
 
 
 
Fading Comet C/2023 A3 Tsuchinshan-ATLAS is down to 3 panels of 3.3 degrees to capture most of the comet this October 29th
 
 
 
Notes:
1.  The field of stars looks brighter since their is only 3x panels and the view appears closer at the same resolution. 4x panel mosaics lead to a zoomed out view to fit the same monitor.
2.  A nice 11th magnitude globular cluster NGC 6426 can be easily seen just below T-A's centroid.
3.  Comet striations have changed since the previous night's, unpublished image.  
4.  I've eased up on the saturation a bit lending to a calibrated buttery yellow vs brownish dusty appearence.
5.  I could barely decern the comet as a large diffuse area with the naked eye.  (Averted vision only.)  Previous night I could see the streak like nature of the comet (also averted vision only).  The differences may be due to the location of T-A this night between bright stars of Oph.
6.  Still a fine object in binoculars!
Dan
 
 
 
Full resolution link:
https://astrob.in/8p18b9/0/
 
 
 
Observational Notes:
scope: RASA11  fl620mm F/2
Seeing: 4/5
Transparency: 8/10
Observer: DEBartlett
Place: JuneLake California USA (Altitude +2357m)
 
Image Info (all ):
Down sampled 2x2 (CMOS = BIN 2x2)
(All images processed solely using PixInsight)
 
Panel1:
Projection ............... Gnomonic
Projection origin ........ [4552.005219 3053.871939] px -> [RA: 17 47 44.954  Dec:  +3 43 37.25]
Resolution ............... 2.506 arcsec/px
Rotation ................. 0.0 deg
Reference system ......... ICRS
Observation start time ... 2024-10-29 02:09:16 UTC
Observation end time ..... 2024-10-29 03:01:37 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 30 N  2357 m
Focal distance ........... 618.96 mm
Pixel size ............... 3.76 um
Field of view ............ 3d 10' 7.3" x 2d 7' 33.3"
Image center ............. RA: 17 47 44.954  Dec:  +3 43 37.25  ex: +0.001965 px  ey: +0.000560 px
Image bounds:
   top-left .............. RA: 17 54 13.557  Dec:  +4 44 37.39  ex: -1.761410 px  ey: -1.119032 px
   top-right ............. RA: 17 41 30.701  Dec:  +4 49 55.16  ex: +1.149397 px  ey: -0.715377 px
   bottom-left ........... RA: 17 53 58.189  Dec:  +2 37 07.84  ex: -1.032089 px  ey: -0.052622 px
   bottom-right .......... RA: 17 41 17.156  Dec:  +2 42 22.81  ex: +2.048601 px  ey: +0.096844 px
 
Panel2:
Projection ............... Gnomonic
Projection origin ........ [4552.002486 3053.907072] px -> [RA: 17 57 37.532  Dec:  +4 25 06.87]
Resolution ............... 2.503 arcsec/px
Rotation ................. 0.0 deg
Reference system ......... ICRS
Observation start time ... 2024-10-29 03:06:34 UTC
Observation end time ..... 2024-10-29 03:49:49 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 30 N  2357 m
Focal distance ........... 618.93 mm
Pixel size ............... 3.76 um
Field of view ............ 3d 10' 7.8" x 2d 7' 33.6"
Image center ............. RA: 17 57 37.532  Dec:  +4 25 06.87  ex: -0.031447 px  ey: -0.009794 px
Image bounds:
   top-left .............. RA: 18 04 06.617  Dec:  +5 26 07.42  ex: -1.190362 px  ey: -0.942092 px
   top-right ............. RA: 17 51 22.824  Dec:  +5 31 22.52  ex: +0.928690 px  ey: -1.265642 px
   bottom-left ........... RA: 18 03 51.049  Dec:  +3 18 37.88  ex: -1.079284 px  ey: +0.032843 px
   bottom-right .......... RA: 17 51 09.436  Dec:  +3 23 50.93  ex: +2.174430 px  ey: -0.047025 px
 
Panel3:
Projection ............... Gnomonic
Projection origin ........ [4551.889190 3053.713409] px -> [RA: 18 07 47.571  Dec:  +5 08 55.97]
Resolution ............... 2.506 arcsec/px
Rotation ................. 0.0 deg
Reference system ......... ICRS
Observation start time ... 2024-10-29 04:03:29 UTC
Observation end time ..... 2024-10-29 04:19:16 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 30 N  2357 m
Focal distance ........... 618.73 mm
Pixel size ............... 3.76 um
Field of view ............ 3d 10' 11.6" x 2d 7' 36.2"
Image center ............. RA: 18 07 47.560  Dec:  +5 08 55.75  ex: -0.003350 px  ey: -0.021328 px
Image bounds:
   top-left .............. RA: 18 14 17.264  Dec:  +6 10 01.65  ex: -1.723290 px  ey: -0.978244 px
   top-right ............. RA: 18 01 32.119  Dec:  +6 15 06.23  ex: +1.283229 px  ey: -1.113412 px
   bottom-left ........... RA: 18 14 01.583  Dec:  +4 02 29.85  ex: -1.117657 px  ey: +0.079481 px
   bottom-right .......... RA: 18 01 18.942  Dec:  +4 07 31.86  ex: +2.183453 px  ey: -0.007453 px