HFG 1 is a very old large, low-surface-brightness planetary nebula in Cassiopeia. It surrounds, and was produced by, a binary star system (V664 Cas) that is moving rapidly through our Galaxy. V664 Cas is comprosed of a white dwarf star and a large red giant. The two stars are very close and rotate around their common centre of gravity every 14 hours. The star system is moving towards the lower left of the image. As HFG 1 plows through the interstellar medium, a bluish bowshock is produced; and a red trail of gas is left behind in its wake.
EQUIPMENT USED
Twin APM TMB LZOS 152 refractors
10Micron GM2000 HPS mount
Twin QSI6120 CCD cameras
Astrodon filters
IMAGE CAPTURE
5nm H-Alpha: 33x1800 bin 2x2
3nm OIII: 35x1800 bin 2x2
Luminance: 11x600 bin 1x1
Red: 10x300 bin 1x1
Green: 10x300 bin 1x1
Blue: 10x300 bin 1x1
Total integration: 38.3 hours
Pixel scale: 0.533 arcsec/pixel
Field radius: 0.351 degrees
Capture dates: 15 October - 6 November 2019
Capture location: Fregenal de la Sierra, Spain

Copyright: Peter Goodhew