Observing Log for 2007-01-23
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2007-01-23


Location: Billingborough (South Lincolnshire, UK)
From: 2007-01-23 13:10 UT
To: 2007-01-23 13:15 UT
Equipment: Solarscope
Temperature: 2.5C ...
Dew Point: -1.4C ...
Humidity: 76% ...
Wind Speed: 5.3mph ...
Wind Dir: West North West ...
Pressure: 1017.3hPa ...
Notes:

Partly cloudy and breezy day. Took the Solarscope out to do a quick sunspot count.

Sun

From: 2007-01-23 13:10 UT
To: 2007-01-23 13:15 UT

Active area 939 was still visible although, unlike yesterday, only two spots were visible.

Location: Billingborough (South Lincolnshire, UK)
From: 2007-01-23 19:30 UT
To: 2007-01-23 20:37 UT
Equipment: Antares 905
Temperature: -0.6C ...
Dew Point: -3.8C ...
Humidity: 80% ...
Wind Speed: Calm ...
Pressure: 1014.9hPa ...
Notes:

Clear, still and cold evening. Although cloud was expected later I decided to take the Antares 905 out so that I could test a couple of new filters I'd recently acquired (a Neodymium filter and a contrast booster).

The Moon

From: 2007-01-23 19:35 UT
To: 2007-01-23 20:05 UT

Decided to start by looking at the Moon. Viewed via the 905 with the 10mm eyepiece and no filter the usual flaring was obvious — depending on the location of my eye at the eyepiece or the location of parts of the Moon in the eyepiece the flaring would either appear bluish or yellowish.

Next I fitted the contrast booster to the diagonal of the 905 and viewed the Moon again. The first thing that was noticeable was the fact that the Moon now had a slight yellow/brown tint — not so bad as to be annoying but very noticeable. The filter did, however, appear to do a very good job of removing any fringing from the view. While it wasn't obvious that any more detail was visible on the Moon (I'd have needed a way of flipping the filter in and out of view to do that) it did seem to tidy up the view.

Next I dropped the 6mm eyepiece into the 'scope and had a quick look around. Given that this wasn't really intended to be a serious observing session (more of an equipment test) I wasn't really aiming for anything in particular. However, the crater Stiborius caught my eye. In the lighting conditions, with it being close to the terminator, I could see what appeared to be a raised terrace within the crater, close to the western edge. It was quite a striking sight and really stood out.

I also noticed, touching the northern edge of Piccolomini, what looked like a set of three small craters, touching each other, and all within another crater. While I could see this crater on my map it wasn't marked with a name so I'll need to find a more detailed map and work out what I was looking at.

At 20:05 UT I lost the Moon behind the house next to me so I decided to take a short break before moving on to something else.

Saturn

From: 2007-01-23 20:15 UT
To: 2007-01-23 20:35 UT

Next I decided to turn the 905 on Saturn. Using the 6mm eyepiece (without any filter in place) the view wasn't that good but the planet was still quite low in the sky and I was also viewing it above the roof of an adjacent house.

The rings were obvious although it was hard to tell if there was any sign of a shadow. I could not detect the Cassini Division. Close by I could see Titan.

I then added the contrast booster and looked again. My impression was that the view didn't really appear that much different, it was hard to tell if I could see more with or without the filter. The fact that Saturn was so low and in such a bad position probably meant that any shortcomings in the 905, that would be reduced by the filter, were masked by the general lack of detail that was available anyway.

At 20:28 UT I noticed that some of the forecast cloud was starting to show up to the west and to the north. Given that some snow was forecast too I got ready to pack up pretty soon.

With the filter still in place I carried on watching Saturn for some time with a hope to getting a few good steady moments. While the view did appear to slowly improve as the planet got higher I didn't see any extra detail. I switched back to the view without the filter and still couldn't see any obvious difference. About the nearest I could come to seeing any difference was that the view without the filter appeared slightly "softer" than with but, at the same time, in the odd very steady moment I also felt that there was little difference without or without the filter.

End of session

Time: 2007-01-23 20:37 UT
Temperature: -0.8C ...
Dew Point: -4.0C ...
Humidity: 79% ...
Wind Speed: Calm ...
Pressure: 1013.5hPa ...

By now I could see even more cloud to the north and west and, overhead, it was starting to look rather hazy too. Having at least managed to test the contrast booster I decided it was time to pack up before it got really cloudy and there was a chance of snow starting to fall.


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Dave Pearson <davep@davep.org>
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