12P/Pons Brooks 2024-Apr-01 Dan Bartlett

_12P_Pons_Brooks_C6HyperStar_asi2600mcP_32x30sec_2024_04_01_202607PDT_JuneLake_California_USA_DEBartlett

Quite happy to see the subframes calibrate out. With a central obstruction of the camera, covering a diameter of 90mm of the 150mm primary mirror of the Celestron C6 SCT, it's a surprise to see any light getting to the camera sensor. Individual raw frames looked horrible with a central brightening juxtapose to the vignetting taking up most of each subframes image. I'll try a camera taking up less area in the future for comparison.

I certainly over stretched this image causing a molted effect on the background. I wanted to squeeze as much "tail" as possible to compare this to the main scope's image previously processed.

Full Resolution Image: https://astrob.in/ob34lw/B/

Observational details:
Backyard setup
scope: C6 SCT HyperStar fl300mm D150mm
exposure: 32 x 30 sec
Seeing: 4/5
Transparency 8/10
Observer: DEBartlett
Place: June Lake_California USA


Image Info (Processed images):
Projection ............... Gnomonic
Projection origin ........ [865.356430 1224.615723] px -> [RA: 2 18 35.233 Dec: +23 29 35.54]
Resolution ............... 5.049 arcsec/px
Rotation ................. 20.282 deg
Reference system ......... ICRS
Observation start time ... 2024-04-02 03:26:07 UTC
Observation end time ..... 2024-04-02 03:26:37 UTC
Geodetic coordinates ..... 119 04 46 W 37 46 51 N 2360 m
Focal distance ........... 307.22 mm
Pixel size ............... 7.52 um
Field of view ............ 2d 25' 34.6" x 3d 26' 9.8"
Image center ............. RA: 2 18 35.232 Dec: +23 29 35.55 ex: +0.000056 px ey: -0.000048 px
Image bounds:
top-left .............. RA: 2 26 12.150 Dec: +24 40 00.52 ex: -1.117495 px ey: -1.106483 px
top-right ............. RA: 2 16 12.545 Dec: +25 30 34.52 ex: +0.013149 px ey: -1.101804 px
bottom-left ........... RA: 2 20 53.977 Dec: +21 27 26.58 ex: -1.541806 px ey: +1.204398 px
bottom-right .......... RA: 2 11 04.194 Dec: +22 17 05.32 ex: +0.008577 px ey: +0.008814 px