Addressing the formation of the solar system
Mon, 6 Apr 2009 22:20:58 -0700 (PDT)
How do accretion discs form in a flat plane around a star?
How does the gravitational order bring matter together in the solar
plane. How then does this matter proceed to become planets?
There were trillions of lumps of matter. How did they come together
for the order of the solar system we now see?
Nobody ...
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Skyglow subtraction
Sun, 5 Apr 2009 13:17:59 -0700 (PDT)
Hi,
I've been experimenting with my Canon 450d taking wide field shots
through a 70-300mm zoom lens. Living in West London means I quickly
end up with some very 'orange' pictures because of the light pollution
and sky glow. As an experiment I tried subtracting the sky glow by
taking a 30 second shot and then im ...
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ZZ Car
Sat, 04 Apr 2009 10:24:49 +0300
Hi there.
I've been wondering what has happened to the designation "ZZ Car". I'm
used to see it in the literature as identical to "l Carinae". If you
make a query in the Simbad database, you'll find out that ZZ Carinae is
some other variable than the cepheid l Carinae. Likewise, the General
Catalogue of Var ...
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Amateur images of Trans-Neptunian objects - Varuna
Thu, 2 Apr 2009 00:17:03 -0700 (PDT)
Amateur images of Trans-Neptunian objects - Varuna
Varuna (2000 WR106) is a Kuiper Belt object and is classified as both
a dwarf planet and as a cubewano.
Imaged on March 24th 2009 using the 0.61m f/10 Cassegrain at the
Sierra Stars Observatory at magnitude 20.1.
http://www.martin-nicholson.info/varuna/varu ...
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mounting telescope
Wed, 1 Apr 2009 18:40:15 +0200
Hello there,
I'm wondering what mounting type I should buy: equatorial or az mounting.
I have noticed that an equatorial mounting needs to be aligned to the
polaris star, but what if this star is hardly visible (for example buildings
or another objects)? Is it possible to use this mounting as a normal az
mou ...
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Amateur images of Trans-Neptunian objects - Orcus
Wed, 1 Apr 2009 09:10:20 -0700 (PDT)
Amateur images of Trans-Neptunian objects - Orcus
Orcus (2004DW)
Orcus is a Kuiper Belt object and is classified as both a dwarf planet
and as a plutino.
Imaged on March 28th 2009 at magnitude 19.2.
http://www.martin-nicholson.info/orcus/orcus.htm ...
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5.1 day hi-res lunar mosaic
Wed, 01 Apr 2009 13:12:44 +0100
Here's another hi-res lunar mosaic this time composed of 78 frames.
Each frame was distilled from an AVI via Registax 5. All 78 frames
were manually assembled to produce the hi-res mosaic available in the
link.
Full size image (1.7Mb):
http://www.digitalsky.org.uk/lunar/2009-03-31_20-12-54_Red_mosaic-final_flat ...
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BBC terminology boob?
Wed, 1 Apr 2009 02:35:56 -0700 (PDT)
People
In discussing the great 28" refractor the expert Greg repeatedly
mentions *sleeks* as one of the limiting factors of optical glass
production in the past.
What he really means, of course, are *striae*. Areas within the body
of the glass which have a slight difference in refractive index to the
majorit ...
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Large lunar mosaic (4.1 day old Moon)
Tue, 31 Mar 2009 08:46:30 +0100
Here's the Moon captured on the 30th March put together as a mosaic of
65 frames. Each was captured using a Lumenera SKYnyx 2-0M camera at
the prime focus of a C-14 SCT telescope.
Full sized version is here (1.4Mb):
http://www.digitalsky.org.uk/lunar/2009-03-30_19-15-32_Red-mosaic-final.jpg
50% version is h ...
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New Robin Hood-Astronomical Continuity Boob
Mon, 30 Mar 2009 20:59:09 +0100
I missed the first episode of this, but it was repeated on BBC3 tonight.
The impossible rescue takes place during a total solar eclipse (handy that)
over Nottingham. Immediately afterwards, Robin is seen silhouetted on the
battlements against a clear blue sky--with a first quarter moon in the
background abov ...
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