Observing Log for 2007-03-27
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2007-03-27


Location: Billingborough (South Lincolnshire, UK)
From: 2007-03-27 12:35 UT
To: 2007-03-27 12:40 UT
Equipment: Solarscope
Temperature: 13.8C ...
Dew Point: 9.6C ...
Humidity: 76% ...
Wind Speed: Calm ...
Pressure: 1014.2hPa ...
Notes:

The day started out very foggy but cleared somewhat into the afternoon. When it was clear enough I took the Solarscope out to do a quick sunspot count.

Sun

From: 2007-03-27 12:35 UT
To: 2007-03-27 12:40 UT

No spots or other marks visible on the Sun.

Location: Billingborough (South Lincolnshire, UK)
From: 2007-03-27 18:50 UT
To: 2007-03-27 19:45 UT
Equipment: Antares 905
Temperature: 9.8C ...
Dew Point: 5.5C ...
Humidity: 75% ...
Wind Speed: Calm ...
Pressure: 1013.7hPa ...
Notes:

A reasonably clear but slightly damp and misty evening. Although I had to be elsewhere a little later on in the evening I decided to have a quick session observing Venus and, if there was time, a quick look at the Moon (especially given that Rupes Recta would be favourably lit).

Venus

From: 2007-03-27 18:50 UT
To: 2007-03-27 19:10 UT

I first lined Venus up in the 905 using the 25mm eyepiece and then swapped it for the 6mm eyepiece. The image was very indistinct and had lots of blue fringing. I then added the contrast booster and this gave an instant improvement (I can see this becoming a more or less permanent fixture on the 905) with Venus now obviously showing a gibbous phase. There was, however, still some red fringe.

As with my previous session observing Venus I added the #80A medium blue and this eliminated pretty much all of the fringing. Those two filters appear to be a winning combination, at least for something as low down and as high-contrast as Venus.

I then added the 2x barlow and even that wasn't a terrible view. While the image was a little soft there was pretty much no colour fringe to distract from the view. Once again it was very obvious that I was looking at a planet that was displaying a very distinct phase.

I kept observing Venus until around 19:10 UT and then, given that I obviously wasn't going to get anything extra out of the planet, I decided to move on to the Moon.

The Moon

From: 2007-03-27 19:15 UT
To: 2007-03-27 19:45 UT

While I had some time left I decided to have a quick look at the Moon and, in particular, Rupes Recta (something I used to observe a fair bit as a child, back when I was a member of the Lunar Section of the Junior Astronomical Society).

With the 6mm eyepiece (and keeping the contrast booster in place) Rupes Recta was immediately and obviously visible. Just as I remembered it gave the impression of being a large sharp cliff (something it really isn't). Close by I could see Brit and, in the wall of Brit, I could easily see Brit A.

I then added the 2x barlow and the view was still quite good.

Looking at the general area around Rupes Recta I noted that "wrinkles" to the West of Brit, along with other features in the area, give a very strong impression of the whole region being surrounded by the remains of a very circular ghost crater.

About way between Brit and the terminator I could see Nicollet. Further on in that general direction, more or less on the terminator, I could see Wolf.

Pretty much touching the south wall of Thebit I could see a very small crater which I could make out on my map but which didn't have a name marked.

At this point I removed the 2x barlow and carried on using just the 6mm eyepiece.

Further south Tycho looked fantastic with its floor in shadow and its central peak standing out in the sunlight. The shadow of the central peak was also very obvious.

Even further south I could see Clavius cutting into the terminator. Two very distinct craters were visible on its floor, one of which (the eastern most one) was throwing quite a long shadow. I could also make out Rutherfurd, just visible in the wall of Clavius.

Buried right in the terminator, down close to the south pole, I could just make out Newton.

At this point (19:45 UT) my time was up and I needed to call an early end to the session and pack up.


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Dave Pearson <davep@davep.org>
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