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Nova Delphinus 2013

By |2017-01-31T10:52:43+00:0031 August 2013|Categories: News, Other|

Mag 6+?
2013-08-30 21:28 UT
200mm f5 newtonian, unguided
4×30s ISO 800, darks
Canon EOS 350D modded, Astronomik CLS
Captured in APT, Processed in Nebulosity, PS CS5

Discovered 14 Aug 2013 by Koichi Itagaki of Yamagata, peaked at mag. 4.5.
It’s about 13,000 light years away. Was originally quite blue but is now much redder – this is what sometimes happens as novae evolve.

From Sky & Telescope

The nova was discovered by Koichi Itagaki of Yamagata, Japan, in an image taken at 14hhUniversal Time (2 p.m. EDT) on August 14th. It was not present in a photo that he took the previous day. Here is the announcement from the IAU’s Central Bureau for Astronomical Telegrams. The star was apparently 17th magnitude before erupting, so it brightened roughly 100,000-fold to its peak on August 16th.

A classical nova happens in a special kind of tightly-orbiting binary star system: one where a relatively normal star pours a stream of hydrogen onto the surface of a companion white dwarf. When the layer of fresh hydrogen on the white dwarf’s surface grows thick and dense enough, the bottom of the layer explodes in a runaway hydrogen-fusion reaction — a hydrogen bomb in the shape of a thin shell roughly the size of Earth. The underlying white dwarf remains intact, and as new hydrogen builds up, the process may repeat in a few years to tens of thousands of years.

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Albireo

By |2013-08-02T16:27:19+00:0021 August 2011|Categories: News, Other|

2011-08-21
200mm f5 Newtonian MPCC unguided
Canon EOS 350D
15x10s darks ISO 400
Captured in APT
Processed in Nebulosity and PS CS5
Test shot to get everything working again after the summer break.

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Aurora 2003-11-20

By |2017-01-31T10:52:50+00:0031 August 2009|Categories: Other|

aurora1-thumb20-11-2003
Olympus fixed lens camera
This was an aurora that covered an amazing amount of the sky. This image is looking south-east! Pity about the light pollution and the passing car headlights.

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Noctilucent Clouds 2009-07-21

By |2018-06-19T11:51:46+00:0031 August 2009|Categories: NLC, Other|

21-07-2009
Canon EOS 350D
An amazing display of noctilucent clouds.

For a description of Noctilucent Clouds, see Wikipedia:

Noctilucent clouds, are tenuous cloud-like phenomena that are the “ragged-edge” of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. The name means roughly night shining in Latin. They are most commonly observed in the summer months at latitudes between 50° and 70° north and south of the equator.

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