HFG 1 & Abell 6 Planetary
( www.deep-sky-astroteam.de )
Eggersdorf, GER / 27.+ 28.+ 29. November 2016
10" f/4 ONTC Newton
Celestron CGE GPS
20x 1800" Astronomik Ha 6nm
23x 1800" Astronomik [OIII] 6nm
9x 300" je Astronomik RGB
Total exposure time:
HFG1 has been discovered by Heckerthorn, Fesen and
Gull in 1982.
HFG1 was created by V664 Cas, a star with a magnitude
of 14.5. But this is not a ordinary star but a binary
star system consisting
of a white dwarf and a sun alike star rotating around
each other every 14 hours in a distance of only a few
The binary system is making it's way through our Milky
way very fast.
When HFG1 is moving that fast throug the interstellar
material a shock front is generated.
A long, red track of 10,000 year old gas is left
behind at any place, between 29 and 59 km per second,
depending o the distance to the sun.
This picture clearly shows the interesting structure
of HFG1.It is defined as a planetary nebula of type F,
it seems to be filled evenly.
The narrow blueish shock front surrounds the central
area with a small gap. The front is much brighter in
the south which points
to some interaction between the front and the
interstellar matter. The fron is incomplete and
invisible in the north.
Lifetime of planetary nebulae is about 10,000 years
which is very short compared to the lifetime of about
10 billion years of the sun alike star.
HFG1 is quite old and will disperse soon while the
white dwarf is cooling down more and more and paled
for billions of years.
This is the destiny our sun is facing in about 5
The picture shows another planetary nebula: Abell 6.
This nebula also is emitting light in the OII band
it's intensity in the range of hydrogen is low.
Abell 6 appears to be circular with a diameter of
almost 3 arc minutes.
It's edge is partly brightened terminated sharply. The
central star is very faint and can barely be seen.
Image processing: Nico Geisler, Frank Iwaszkiewicz
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