2024-12-22 NGC7789

NGC7789 imaged at Buford Mountain Conservation Area.  The telescope was a 200 mm aperture, 730 mm focal length F/3.65 Boren-Simon PowerNewton Astrograph with 0.73x focal reducer and coma corrector.  The imaging camera was a QSI683wsg-8 with 31 mm Astrodon II filters and cooled to -15C.  It was off-axis guided using PHD2.  The system was mounted on a Losmandy G11G2 equatorial head on a permanent pier.  The system was controlled with Sequence Generator Pro and PHD2 and the image was processed in PixInsight.

Luminance:  15 frames x 5 minutes binned 1x1.  RGB:  7 frames each x 5 minutes binned 2x2.  Total integration time of 3 hours.

<Plate Solve>

Creation time ............ 2024-12-23 03:51:29 UTC

Creation software ........ PixInsight 1.8.9-3 / ImageSolver 6.2.12 (Windows)

Reference catalog ........ Gaia DR3

Linear transformation matrix (world[ra,dec] = matrix * image[x,y]):

-4.07787320e-04 +2.09515658e-05 +6.51999525e-01

-2.09420720e-05 -4.08148656e-04 +5.45742171e-01

WCS transformation ....... Thin plate spline

Control points ........... 1715

Spline lengths ........... l:1715 b:1715 X:1715 Y:1715

Projection ............... Gnomonic

Projection origin ........ [1663.186190 1251.778240] px -> [RA: 23 57 27.040 Dec: +56 42 32.89]

Resolution ............... 1.471 arcsec/px

Rotation ................. -2.965 deg

Reference system ......... ICRS

Observation start time ... 2024-09-07 06:06:11 UTC