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Science Forum Index » Astro - Amateur Forum » M48/NGC 2548 - Great seeing but poor transparency
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 2:04 pm |
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Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Clear skies!
Anthony. |
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| Andy Hewitt |
Posted: Thu Feb 22, 2007 4:19 pm |
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Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Quote: Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Clear skies!
Nice pic. It's just not fair that I can't get them like that!
The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about 2
hours viewing in the last two weeks.
--
Andy Hewitt
<http://web.mac.com/andrewhewitt1/> |
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 4:20 pm |
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Andy Hewitt wrote:
Quote: Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Clear skies!
Hi Andy,
Quote: Nice pic. It's just not fair that I can't get them like that!
I have produced much better results under better transparency.
Quote:
The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about 2
hours viewing in the last two weeks.
It seems every winter is worse than the previous one. This winter in
particular has been very atypical for us in the southeastern
Mediterranean who usually enjoy very good weather year-round.
Anthony. |
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| W. H. Greer |
Posted: Thu Feb 22, 2007 5:16 pm |
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On Thu, 22 Feb 2007 Anthony Ayiomamitis <anthony@perseus.no2spam.gr>
wrote:
Quote: The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Nevertheless, the result looks very nice! Some color differences are
distinguishable amongst some of the brighter stars.
I suppose personal preference comes in when it comes to 'diffraction'
spikes. Some people try to minimize them, others introduce them ;-)
Still, it *is* a nice image!
--
Bill
Celestial Journeys
http://cejour.blogspot.com |
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| Andy Hewitt |
Posted: Thu Feb 22, 2007 5:35 pm |
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Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Hi Anthony
Quote: Nice pic. It's just not fair that I can't get them like that!
I have produced much better results under better transparency.
Indeed, I just know I haven't the equipment to start with anyway.
Quote: The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about 2
hours viewing in the last two weeks.
It seems every winter is worse than the previous one. This winter in
particular has been very atypical for us in the southeastern
Mediterranean who usually enjoy very good weather year-round.
That's more worrying than ever, I'm actually replying in the uk.s.a.
group, and posting from the north east of England. Doesn't hold much
hope for us here if you can't get a clear sky down there :-(
--
Andy Hewitt
<http://web.mac.com/andrewhewitt1/> |
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| RMOLLISE |
Posted: Thu Feb 22, 2007 6:39 pm |
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On Feb 22, 12:04 pm, Anthony Ayiomamitis <anth...@perseus.no2spam.gr>
wrote:
Quote: Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available athttp://www.perseus.gr/Astro-DSO-NGC-2548.htm.
Clear skies!
Anthony.
Hi Anthony:
Nice shot. I was conincidentally looking at M93 last night myself with
my little Meade ETX 125. While we've had at least some clear weather
down here on the U.S. Gulf Coast, last night was like yours, clear but
poor transparency.
Unk Rod |
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| Terry B |
Posted: Thu Feb 22, 2007 6:43 pm |
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"Andy Hewitt" <wildrover.andy@googlemail.com> wrote in message
news:1htydho.18whduh13wqsueN%wildrover.andy@googlemail.com...
Quote: Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Clear skies!
Nice pic. It's just not fair that I can't get them like that!
The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about 2
hours viewing in the last two weeks.
Our local astro group tried to have a moon viewing night last night here (in
Aus) but that annoying grey filter wouldn't go away. At least someone got
some viewing in.
At least we had a bit of rain to justify the clouds.
Terry B
Armidale
Australia |
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| Starboard |
Posted: Thu Feb 22, 2007 8:09 pm |
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 9:52 pm |
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RMOLLISE wrote:
Quote: On Feb 22, 12:04 pm, Anthony Ayiomamitis <anth...@perseus.no2spam.gr
wrote:
Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available athttp://www.perseus.gr/Astro-DSO-NGC-2548.htm.
Clear skies!
Anthony.
Hi Anthony:
Hi Rod,
Quote:
Nice shot. I was conincidentally looking at M93 last night myself with
my little Meade ETX 125. While we've had at least some clear weather
down here on the U.S. Gulf Coast, last night was like yours, clear but
poor transparency.
In fact M93 is one of my immediate targets during the next imaging
opportunity as I am close to completing the imaging of all current
seasonal open clusters.
Anthony.
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 9:54 pm |
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Terry B wrote:
Quote: "Andy Hewitt" <wildrover.andy@googlemail.com> wrote in message
news:1htydho.18whduh13wqsueN%wildrover.andy@googlemail.com...
Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Dear group,
The skies finally cleared last night for the first time in about three
weeks. With 92% humidity, the seeing was exceptional for this time of
the year ranging from 1.8-1.9" (FWHM) at the start of the session and
which was down to 1.52" a few hours thereafter. However, the
transparency was poor and partially impacted the net result.
The open cluster M48 in Hydra is most impressive and I am disappointed
the poor transparency did not permit for an even better result. For
those interested, the result is available at
http://www.perseus.gr/Astro-DSO-NGC-2548.htm .
Clear skies!
Nice pic. It's just not fair that I can't get them like that!
The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about 2
hours viewing in the last two weeks.
Our local astro group tried to have a moon viewing night last night here (in
Aus) but that annoying grey filter wouldn't go away. At least someone got
some viewing in.
The Baader cloud filter does wonders! :-)
Quote: At least we had a bit of rain to justify the clouds.
Ditto for the Baader rain filter! :-)
No, I do not own any shares in Baader.
Anthony.
Quote:
Terry B
Armidale
Australia
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| M |
Posted: Thu Feb 22, 2007 9:55 pm |
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I reckon in the 6 weeks of owning my new scope, I have managed to get out
about 6 times.......not sure how to 'measure' transparency, clearness, etc
but suffice to say IMHO the skies have been pretty awful and even when I can
see stars theres that high level alto and cirro stratus which is just great
combined with LP.......I am glad I didnt break the bank and get a SCT on
credit........with the amount of use it wouldve got I would be feeling
pretty bad with a young family to spend my hard earned £s on.......
Still I hold out hope that soon I will be able to get a cloud free night sky
and drive to the Highlands of Scotland for some perfect dark skies......or
even just up the road to northern Angus for some 'almost' dark skies
--
M
------
"Any society that would give up a little liberty to gain a little security
will deserve neither and lose both."
[Benjamin Franklin]
"War is delightful to those who have had no experience of it."
[Erasmus]
"A collision at sea can ruin your entire day."
[Thucydides]
"Andy Hewitt" <wildrover.andy@googlemail.com> wrote in message
news:1htyh47.1out64zl7rnhoN%wildrover.andy@googlemail.com...
Quote: Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Hi Andy,
Hi Anthony
Nice pic. It's just not fair that I can't get them like that!
I have produced much better results under better transparency.
Indeed, I just know I haven't the equipment to start with anyway.
The viewing of late has been appalling hasn't it? I got a new 150mm Dob
last week, and my 105mm Mak arrived yesterday. I reckon I've got about
2
hours viewing in the last two weeks.
It seems every winter is worse than the previous one. This winter in
particular has been very atypical for us in the southeastern
Mediterranean who usually enjoy very good weather year-round.
That's more worrying than ever, I'm actually replying in the uk.s.a.
group, and posting from the north east of England. Doesn't hold much
hope for us here if you can't get a clear sky down there :-(
--
Andy Hewitt
http://web.mac.com/andrewhewitt1/ |
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 9:55 pm |
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Starboard wrote:
Quote: Great shot. I'd like to see more.
Go wild: http://www.perseus.gr/Astro-DSO-Clust-Open.htm ... one or two
of the images are very bad due to bad seeing and will be reimaged during
the first available opportunity.
Me too.
Anthony.
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| Anthony Ayiomamitis |
Posted: Thu Feb 22, 2007 10:00 pm |
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M wrote:
Quote: I reckon in the 6 weeks of owning my new scope, I have managed to get out
about 6 times.......not sure how to 'measure' transparency, clearness, etc
but suffice to say IMHO the skies have been pretty awful and even when I can
see stars theres that high level alto and cirro stratus which is just great
combined with LP.......I am glad I didnt break the bank and get a SCT on
credit........with the amount of use it wouldve got I would be feeling
pretty bad with a young family to spend my hard earned £s on.......
Still I hold out hope that soon I will be able to get a cloud free night sky
and drive to the Highlands of Scotland for some perfect dark skies......or
even just up the road to northern Angus for some 'almost' dark skies
Spring and summer are not too far away. Patience as usual.
My primary concern is next weekend and the red object which will grace
the sky for about 75 minutes. Let's keep our fingers crossed that the
weather will do us a (huge) favour.
Anthony. |
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| Andy Hewitt |
Posted: Fri Feb 23, 2007 6:22 am |
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Anthony Ayiomamitis <anthony@perseus.no2spam.gr> wrote:
Quote: M wrote:
I reckon in the 6 weeks of owning my new scope, I have managed to get out
about 6 times.......not sure how to 'measure' transparency, clearness, etc
but suffice to say IMHO the skies have been pretty awful and even when I can
see stars theres that high level alto and cirro stratus which is just great
combined with LP.......I am glad I didnt break the bank and get a SCT on
credit........with the amount of use it wouldve got I would be feeling
pretty bad with a young family to spend my hard earned £s on.......
Still I hold out hope that soon I will be able to get a cloud free night sky
and drive to the Highlands of Scotland for some perfect dark skies......or
even just up the road to northern Angus for some 'almost' dark skies
Spring and summer are not too far away. Patience as usual.
Indeed, although in mid-summer the sky doesn't really get quite dark
enough for ideal viewing, and you do tend to get a lot more pollution in
the air too.
Quote: My primary concern is next weekend and the red object which will grace
the sky for about 75 minutes. Let's keep our fingers crossed that the
weather will do us a (huge) favour.
I'm not holding out any hope for that, my local weather forecast is for
clouds for the next 5 days.
--
Andy Hewitt
<http://web.mac.com/andrewhewitt1/> |
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| Andy Hewitt |
Posted: Fri Feb 23, 2007 6:22 am |
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M <spam@spamme.com> wrote:
Quote: I reckon in the 6 weeks of owning my new scope, I have managed to get out
about 6 times.......not sure how to 'measure' transparency, clearness, etc
but suffice to say IMHO the skies have been pretty awful and even when I can
see stars theres that high level alto and cirro stratus which is just great
combined with LP.......I am glad I didnt break the bank and get a SCT on
credit........with the amount of use it wouldve got I would be feeling
pretty bad with a young family to spend my hard earned £s on.......
Yes, much the same here really, I usually measure the clarity of viewing
by seeing how much 'twinkle' the stars have (when I can see them at all
that is). It's also why I decided to set a maximum budget for the
scopes, I could easily have spent more, but didn't see the point.
--
Andy Hewitt
<http://web.mac.com/andrewhewitt1/> |
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