Imaging telescopes or lenses: APM Telescopes TMB - LZOS Apo refractor 152/1200
Imaging cameras: QSI 6120wsg-8
Mounts: 10Micron GM2000HPS II
Guiding cameras: Starlight Xpress Lodestar Autoguider X2
Filters: Astrodon Lum · Astrodon Blue · Green · Red · Astrodon SII 5nm · Astrodon OIII 3 nm · Astrodon 5nm H-Alpha filter
Frames:
Astrodon 5nm H-Alpha filter: 56x1800" bin 2x2
Astrodon Blue: 15x300" bin 1x1
Green: 15x300" bin 1x1
Astrodon Lum: 20x600" bin 1x1
Astrodon OIII 3 nm: 25x1800" bin 2x2
Red: 15x300" bin 1x1
Integration: 47.6 hours
Astrometry.net job: 3152620
RA center: 6h 29' 34"
DEC center: +71° 4' 36"
Pixel scale: 0.533 arcsec/pixel
Orientation: -6.731 degrees
Field radius: 0.368 degrees
Resolution: 4150x2734
Locations: e-Eye, Fregenal de la Sierra, Extramadura, Spain
Data source: Own remote observatory
Remote source: e-EyE Extremadura
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 amateur image and the first colour image.
Yes it's ridiculously faint!
References:
apod.nasa.gov/apod/ap001128.html
THE ASTRONOMICAL JOURNAL, 115:286-295, 1998 January © 1998. The American Astronomical Society.
aanda.org/articles/aa/full/2001/36/aa1385/aa1385.right.html
Description: star colour
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