12p 20231211 dbartlett

12P/ Pons-Brooks and Nearby Double Star Zeta Lyr from 2023_12_11



Backyard setup
scope: C14HyperStar D = 356mm; fl =729mm; 
exposure: 26 x 120 sec 
Seeing: 4/5
Transparency: 9/10 
Observer: DEBartlett
Place: June Lake_California USA


 
Image Info (closeup):
Projection ............... Gnomonic
Projection origin ........ [1297.130774 1338.687385] px -> [RA: 18 48 22.818  Dec: +38 16 50.65]
Resolution ............... 1.064 arcsec/px
Rotation ................. -2.476 deg
Reference system ......... ICRS
Observation start time ... 2023-12-12 02:44:13 UTC
Observation end time ..... 2023-12-12 03:58:53 UTC
Geodetic coordinates ..... 119 04 46 W  37 46 30 N  2357 m
Focal distance ........... 728.92 mm
Pixel size ............... 3.76 um
Field of view ............ 45' 57.9" x 47' 27.2"
Image center ............. RA: 18 48 22.818  Dec: +38 16 50.65  ex: -0.104819 px  ey: +0.200561 px
Image bounds:
   top-left .............. RA: 18 50 15.219  Dec: +38 41 27.38  ex: -0.845895 px  ey: -1.452470 px
   top-right ............. RA: 18 46 20.018  Dec: +38 39 26.10  ex: +2.530048 px  ey: -1.407298 px
   bottom-left ........... RA: 18 50 24.434  Dec: +37 54 05.66  ex: -0.996309 px  ey: +1.981421 px
   bottom-right .......... RA: 18 46 31.475  Dec: +37 52 01.71  ex: +0.095600 px  ey: -0.520071 px