Viewing
conditions: Excellent transparency
magnitude 6++ skies, below average seeing ; Telescope
10" GS dob and 20x80LW binocs
Observing notes:
Glenore Groove Report 19/20th of August
2006-08-19/20
"Observing from Glenore Grove, our awesome semi dark sky site that was some 80% as dark as Leyburn, from left to right, Mark our gracious hos, Andrew Middy and my best astro buddy Andrew Durick. Equipment in piccies from left to right, my 20x80LW, my 10" f/5 dob and Andrew's 12.5" f/5 truss"
A big thank you to
Mark for hosting us once again at his humble abode out at Glenore
Groove. Since I have not gotten out to darker skies in a while, I was
really keen to get out. Plus the 10" GS dob has not seen dark sky
action. Needless to say I was itching for some good dark sky observing
and galaxy hunting! There were just the 4 of us Andrew (Durick), Andrew
(Middy), Mark and me present. Mark was with his 20x80 triplets, while
Andrew had his 12.5”f/6 truss and me with my 20x80 LW’s and 10” f/5 GS
dob.
The night started off
brilliantly even before nightfall. We spotted a brilliant irdium flare
towards the east which brightened thrice before fading. Cool start to a
great night of superb transparency if indifferent seeing (stars started
to look bloated past 200x magnification so most work was done below
that magnification). As the sky got darker, the milky way became more
and more prominent. I was a little bit worried coming in from Brissie
as there were some bush fires here and there. But the skies were just
glorious from Glenore Groove (as always)! Our home galaxy was so
structured that the dark rifts were apparent. The coal sack near Crux
was black as night and the celestial horse and the pipe nebula were all
easy with the naked eye. And the North American Nebula was also easily
visible without optical aid.
I started with some
of the constellations that were slowly sinking into the twilight such
as Corvus (M 104 the Sombrero brilliant in Andrew's 12.5" f/6 truss and
in my 10" GS dob at powers of about 200x with the dark lane showing
easily and the Corvus planetary...nice central star visible). Also had
a quick sneaky peek at the galaxy fields in Virgo (started off with
M59/60 pair and worked my way to M84/86, stopping at other sights along
the way like M87). I did not have a structured observing program for
tonight and just wanted to hit as many of my faves as possible to see
what they looked like in my 10” dob. The zodiacal light was pretty
bright so the views of the Virgo galaxies were compromised. Also swung
to the south and picked out the quickly sinking Eta Carina Nebula and
surrounds (again Eta Carina was glorious with the NPB filter with its
dark lanes and extensive mottling and the clusters…need I say more?). I
am again reminded of how lucky I am to be observing from such a
southerly location as the skies were just strews with stars and
clusters. I also looked at objects in Centaurus, Crux and Musca. Omega
Centauri was first up and I got superb views of this glorious ball of
stars. I like views of this at 63x in my KK widescan III with the
cluster fully resolved to the core. Higher mags are okay but at such
high powers, loose globs such as Omega start to look more like rich
open clusters. Also looked at NGC 4945 and its small companion. Nice
mottling and it looks as if a bite was taken out of its quarters. NGC
5128, the Centaurus A galaxy with its dark lane bisecting the galaxy
also looked very nice in the 10” and moving north to M83 at the head of
Centaurus, this lovely face on spiral showed its bar and spiral arm
structure in the 10”. Also the spiral planetary in Musca looked great
with the NPB filter. Whilst in the vicinity, we hopped over to Lupus
and looked at the planetary and the galaxies NGC 5643, IC 4444, NGC
5786 surrounding this planetary. This was impromptu but we managed to
bag three new galaxies. Cool.
I next swung to the
northern sky and looked at the usual suspects. As I was sure the small
galaxy near M13 (nice propellar shape of its arms visible) would be
visible, I placed it in the field of view and immediately saw the faint
glow of this small galaxy. Also I knew that M57, the Ring Nebula (nice
unevenly illuminated ring with the dark hole, now not so dark with
inner illumination…cool) had a similar companion. No such luck though
through both the dobs. We will need a better map for this one or even a
photo. M27, the Dumbbell nebula was a glorious sight in Andrew’s 12.5”
with the Dumbbell no longer looking like a Dumbbell as it had its wings
outstretched. Then I had a look at the Veil Nebula in the 12.5” and
then in my 10” dob with Andrew’s OIII filter. All three portions were
visible including pickering’s triangle down the middle. The Veil looks
distinctly clumpy and filamentary and looked like a black and white
photo. Great views all. And while we were on the subject of star death,
Andrew remembered Sp1 in Norma and hunted that down. We got to look at
this faint inconspicuous smoke ring that was brighter on one end with
Andrew's 12.5" and my 10" dobs. Views were very much enhanced with
narrowband filters. Andrew also hunted down a bipolar nebula in Norma
and this one was nice as well with a central bright star and two
nebulous ears on both sides. Will have to check the NGC or IC number
for this.
With that I decided
it was time to scan the star clouds and nebulosities of Sagittarius and
Scorpius. Started off with the easy stuff like open clusters M7
(Ptolemy’s cluster nice companion globular easily visible with some
resolution in the 10”), M6 (the butterfly cluster), the false comet
cluster and some globulars like M4 (star bar easily visible even at
63x), M80 (resolution at this mag as well), M22 (looking like a poorer
cousin of Omega Centauri but fully resolved as well), M55 (sparser
cousin to Omega and M22 also fully resolved at this mag and looking
like an open cluster) and some of the globulars in Sagittarius like M28
(also resolution evident). Also took a slight detour from this and
looked at the Ophiuchus globulars, M10 and M12 and the Wild Duck
cluster, M11 in Scutum. Both were also nicely resolved at 63x in the
10” (you can see that I was a little bit lazy in switching eyepieces).
The Wild Duck was a glorious swarm of stars, appearing more like a
loose globular cluster than an open cluster.
With the clusters out
of the way, I now indulged myself in some nebulosities, screwing on the
NPB to the Orion 20mm Expanse so I would not have to screw and unscrew
the filter from the KK widescan III. M8, the Lagoon showed extensive
nebulosity surrounding the open cluster, appearing much larger than I
have ever seen it before.The hourglass nebula close to its core was
clearly evident as was the dark “lagoon” running through the nebula.
M20, the Trifid likewise showed delicate structure with the dark lanes
so evident. Its reflection component was also easily visible. I then
swung northwards via the small Sagittarius starcloud and hit M17, the
Swan nebula and then M18, the Eagle nebula. Again the Swan looked
brilliant with extra nebulosity surrounding the immediate area of the
Swan. Again at higher powers, the billowy effect down the Swan’s back
was evident as was the dark “lane” running across the Swan’s neck. The
eagle showed traces of the dark “pillars of creation”structure with the
NPB filter but looked more like O’Meara’s little ghost than an eagle.
To top off my Sagittarius tour, we looked at Banard’s galaxy (NGC 6822)
and the little gem planetary.
Since I was still in
the southern part of the sky, I decided to check out NGC 6397 and NGC
6752, the Ara and Pavo globs. Both appeared nicely resolved at 63x.My
fave glob would still have to be the starfish/Pavo glob.It is bright
and has very nicely resolved outstretching arms. And since I was in the
vicinity, I looked at the Pavo galaxy (NGC 6744) as well. Spiral arms
visible in the 10” as well. I then noticed that the SMC was now well
placed for viewing and naturally went for 47 Tucana. Nicely resolved at
63x with a tight but glittering core. High powered views are usually
better for 47 Tucana but tonight the seeing was just not up to it.
To end the night, we
decided to go galaxy hunting once again in the Grus, Sculptor region.
Started with the three bears in Grus (NGC 7582, 7590, 7599, make that four bears as the
fourth member was also easily visible NGC 7552) and several galaxies surrounding
this field, and looked at the brighter galaxies such as NGC 55 (very
nice with the mottling in the fatter part of the galaxy…this galaxy
goes on forever…..), NGC 253 (nice mottling as well and very bright
with its companion globular also resolved nicely NGC 288). And finally
M31 and its companions in the 20x80LW’s as they were too low for the
scopes. And did I mentioned that I looked at M15 in Pegasus as well.
Not fully resolved at 63x. More magnification required.
But the highlights
for me for this trip would be scanning the dark nebula’s and brighter
regions of our home galaxy in my tripod mounted 20x80LW’s. This is the
best time of the year to be a large binocular user. The views of these
were just unreal and cannot be expressed in words. The milky way came
alive in the binocs with stars being resolved against the multitude of
unresolved stars, appearing as clumpiness in our galaxy. And not to
mention all those dark nebulosities……COOL! I will have to get out to
dark skies more often.