AAPOD2 Image Archives
EGB 4
EGB 4 (a nebula discovered by Ellis, Grayson, & Bond in 1984) is NOT a comet, despite it's comet-like appearance. It is an emission nebula surrounding a catacylismic binary star system called BZ Cam in the constellation of Camelopardis.
It has an unusual bow-shock structure as BZ Cam (with it's associated wind) moves through the interstellar medium, similar to the bow wave in front of a ship that is moving through water.
BZ Cam is believed to be a white dwarf star that is accreting mass from an accompanying main-sequence star of 0.3-0.4 solar masses.
It is around 2,500 light years away, and has a space velocity of 125 km/second.
I can only find one previous image of EGB 4 online, a NASA APOD from 2000, so I believe this could be the first amateaur image and thefirst colour image.
Yes it's incredibly faint!
Image capture details:
Astrodon Blue: 15x300"
Astrodon Green: 15x300"
Astrodon Lum: 20x600"
Astrodon Red: 15x300"
Astrodon OIII: 25x1800s bin 2x2
Astrodon Ha: 56x1800s bin 2x2
Total Integration: 48 hours
Captured on my dual rig in Spain.
Scopes: APM TMB LZOS 152 (6" aperture 1200mm focal length)
Cameras: QSI6120wsg8
Mount: 10Micron GM2000 HPS
Copyright Details: Peter Goodhew