Observing Log for 2007-05-19

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Location: Woodland Waters (South Lincolnshire, UK)
From: 2007-05-19 20:20 UT
To: 2007-05-19 23:41 UT
Equipment: Antares 905
Canon EOS 400D

Joined John and Kevin at Woodland Waters for an observing session. The sky was still very light when we arrived, Venus and a crescent Moon hung over the western horizon. Some cloud scattered around but appearing to clear.

Giving Guests a Tour

From: 2007-05-19 20:40 UT
To: 2007-05-19 21:00 UT

A short while after we'd set the 'scopes up and left them to cool down we were joined by a young couple asking what we were looking at. We explained that we weren't looking at anything specific and asked them if they wanted to have a look through the 'scopes.

Over the next 20 minutes or so we gave them a tour of Venus, the Moon and Saturn. As usually happens Saturn seemed to go down a treat.

While showing them Saturn I noticed that the image wasn't too good this evening. It was possible to make out the planet's shadow on the rings but that was about all that could be seen. I couldn't make out the Cassini Division.

Venus was also a bit of a problem too. While it was possible to make out the phase (it was apparent that the phase was smaller than the last time I observed it) there was a lot of false colour (the contrast booster helped a little but not as much as it has in the past) and the image was very unsteady.

Another guest

From: 2007-05-19 21:01 UT
To: 2007-05-19 21:05 UT

Just after the first guests left we had another visit. This person didn't stay very long, just long enough to have a quick look at Saturn through Kevin's ETX125. That sight got a very obvious "wow!" (as it does with most people).

Photographing Venus and the Moon

From: 2007-05-19 21:10 UT
To: 2007-05-19 21:30 UT

I got the Canon EOS 400D out of the car, set it on the tripod, and took some wide angle views of Venus and the Moon together:

Venus and the Moon

Venus and the Moon

Venus, the Moon and Me

Stopping for Coffee

From: 2007-05-19 21:37 UT
To: 2007-05-19 21:47 UT

By 21:37 UT it was obvious that it was going to be a very damp observing session. I noticed that lots of dew was forming on everything. I covered up the log book and anything else that might suffer from getting wet and decided to stop for a short coffee break.


From: 2007-05-19 21:47 UT
To: 2007-05-19 21:57 UT

John had got M51 in his 80mm 'scope and I had a look at it (I would have got it in the 905 too but it was in a position that I can't get that 'scope in to — it's not very good at pointing almost overhead). At first it was difficult to see but, slowly, a very faint ghostly patch came into view using averted vision. I was impressed that I could see anything given that the sky still wasn't anywhere near fully dark.


From: 2007-05-19 22:00 UT
To: 2007-05-19 22:15 UT

Given that Lyra was at a reasonable hight I decided to see how M57 looked in the 905. I found it without too much trouble using the 25mm eyepiece (in that it simply looked like a slightly out-of-focus star) and I then switched to the 6mm eyepiece

With the 6mm it simply looked like a faint disc. There was no hint of the ring structure that I've seen before in the 130M.

Given that the sky still wasn't fully dark I decided to compare the view I had with the view using the Neodymium filter. It did appear to improve things slightly although I wouldn't have said that it brought out any more detail. While I wasn't really comparing like-for-like in terms of observing conditions I'm of the impression that this is an object better left to the 130M.

Antares 905 Fogging Up

Time: 2007-05-19 22:16 UT

By 22:16 UT I noticed that the 905 was starting to fog up. Because of this I decided to cover it up and see if it would clear.


From: 2007-05-19 22:20 UT
To: 2007-05-19 22:30 UT

While the 905 was recovering I had a look at M3 thought Kevin's ETX125. For some reason I've never observed this cluster globular cluster before. I was surprised at how striking the view was.

Observing with a 15mm eyepiece, at first all I could see was a diffuse patch in the sky. As my eye adjusted, and especially when using averted vision, I started to see a mottled effect in the cluster and I soon had the first distinct impression that I was making out individual stars.

Jupiter via EXT125

From: 2007-05-19 23:10 UT
To: 2007-05-19 23:20 UT

After a short coffee break we noticed that Jupiter was visible between trees, low on the horizon. Kevin turned his ETX125 onto it and I spent a short while having a look. All four moons were visible, one to one side of the planet and three to the other side. The view, however, was terrible. It was impossible to make out any detail whatsoever on Jupiter. This wasn't really that surprising given that the planet was so low down and also given that we were observing it thought some thin (and apparently growing) cloud.

Jupiter via 905

From: 2007-05-19 23:23 UT
To: 2007-05-19 23:30 UT

I uncovered the 905 and turned that towards Jupiter. Using the 6mm eyepiece and the contrast booster the view was no better than it had been via the ETX125. I spent a short while just observing but the view never improved and I never saw any detail at all on the planet. At no point could I even make out the two main bands.

End of Session

Time: 2007-05-19 23:41 UT

Over the past hour or so more and more thin cloud had been forming over is and was starting to spread out more. By around 23:41 UT it was obvious that it wasn't going to get any better so we decided to call an end to the session.

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Dave Pearson <davep@davep.org>
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