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All observing logs tagged with The Coathanger

2006-06-28


Location: Billingborough (South Lincolnshire, UK)
From: 2006-06-28 14:55 UT
To: 2006-06-28 15:00 UT
Equipment: Solarscope
Temperature: 22.9C ...
Dew Point: 10.5C ...
Humidity: 47% ...
Wind Speed: Calm ...
Pressure: 1018.7hPa ...
Notes:

Today has been similar to yesterday in that the day has mostly been overcast except for a brief spell of broken cloud in the afternoon. During this brief spell of sunshine I took the Solarscope out to do a sunspot count.

Sun

From: 2006-06-28 14:55 UT
To: 2006-06-28 15:00 UT

Area 897 was more spread out when compared to yesterday (hardly surprising given that it has rotated further into view) and I could count 5 spots in the region. The darkening I noted yesterday wasn't evident today.

New area 898 has come over the limb and comprises of a single, large, circular spot with quite a pronounced penumbra.

Location: Billingborough (South Lincolnshire, UK)
From: 2006-06-28 21:35 UT
To: 2006-06-28 23:34 UT
Equipment: Antares 905
Sky-Watcher Explorer 130M
Temperature: 16.8C ...
Dew Point: 9.0C ...
Humidity: 60% ...
Wind Speed: Calm ...
Pressure: 1019.1hPa ...
Notes:

Calm, clear evening with some thin cloud about. The sky wasn't very dark yet but given that I could see Jupiter from my usual observing spot I decided to get the 905 out and have a look.

Jupiter, including a transit event

From: 2006-06-28 21:35 UT
To: 2006-06-28 22:59 UT

Started out with the 905 and 6mm eyepiece. The image was awful. I could only just see the two main bands. The reason for this was probably down to the quality of the sky and also down to the fact that the 'scope hadn't had much time to cool down yet.

I could see all 4 Jovian moons (one of them was very close to the planet) and I could also see a reasonably bright background star that could have been mistaken for a 5th moon (later checking with Starry Night showed that it was HIP70714 ).

I then added the #80A Medium Blue filter to the 'scope and had another look. While this dulled the image a little it did also appear to improve the contrast. The two main bands stood out a little better, darkening towards the poles became obvious and in moments when the image was steady there was obvious mottling in the bands.

I'd say that tonight's view of Jupiter is the worst one I've had this apparition.

I've never compared the view of Jupiter in the 130M with that in the 905 so, at around 21:53 UT, I brought the 130M out and left it to cool off. A short while later (probably with too little cooling-off time) I lined Jupiter up in the 130M and used the 6mm eyepiece to have a look. The imagine was really terrible — much worse then the image in the 905. While the view was much brighter there was hardly any detail to speak of, almost as if it was impossible to get sharp focus.

I switched from the 6mm to the 10mm eyepiece and things looked a little better. This time the quality compared more favourably with that as seen in the 905+6mm but, even then, I'd say that the 905 won out in terms of detail that could be seen. It would appear that I need to give the 130M a good check-up at some point. While I did give the collimation a quick check when I brought the 130M out I guess I need to have it a really fine tweak some time soon.

I'm also seeing why planetary observers tend to prefer a refractor rather than a reflecting telescope.

Back at the 905 (with the 6mm), at around 22:19 UT, I noticed that the moon closest to Jupiter had apparently got even closer. Compared to when I started observing this evening it was harder to see it, the gap between it and the planet being obviously narrower. I stepped into the office to check what was going on and I confirmed that the moon was Europa and that it was due to start a transit of the planet at around 22:38 UT. My first ever transit of a Jovian moon! Annoyingly, when I came back out of the office, I noticed that some thin cloud had moved in the way and was dulling the view of Jupiter.

By 22:31 UT the image had improved again. I could just see Europa but it was impossible to see a gap between it and the planet — it looked more like a bump on the limb.

By 22:36 UT I had lost sight of Europa. From then until 22:59 UT I kept observing to see if I could detect Europa in front of the planet but I never got a hint of it. This was made harder by the fact that more thin cloud was moving in the way and significantly dulling the view.

Random sweeping of the Milky Way

From: 2006-06-28 23:00 UT
To: 2006-06-28 23:34 UT

To finish off the session I decided to use the 905 for one of the main purposes I intended: just sweeping around the sky and seeing what I can find. Using the 32mm eyepiece I started to have a random sweep and, almost right away, stumbled on The Coathanger (an asterism I first observed almost a year ago).

After spending some more time just sweeping around (mostly around The Milky Way in and around Cygnus) I decided to call it a night at 23:34 UT.


2005-08-29


Location: Billingborough (South Lincolnshire, UK)
From: 2005-08-29 21:07 UT
To: 2005-08-29 22:30 UT
Equipment: Naked Eye
Meade 10x50 Binoculars
Tento 10x50 Binoculars
Notes:

Decided to have another night out with a chair, binoculars and naked eye. Sky was nicely dark when I went out, the Milky Way was very obvious overhead. Some haze about in parts of the sky. Temperature was reasonably warm.

Satellite in Cygnus

Time: 2005-08-29 21:15 UT

Saw a satellite in Cygnus. Moved roughly South to North along and more or less parallel with the "body stars" of the Swan. First saw it in binocular while doing a general sweep of the Milky Way and then followed it with naked eye. Was easy to see and reasonably bright. I wouldn't have put it any brighter than any of the "body stars" but I wouldn't have put it much fainter than the faintest of them.

M71

Time: 2005-08-29 21:29 UT

Tried to see M71 in Sagitta with binocular. I think I could see it. In the correct location I got the vague impression of a faint misty patch, quite small, and only noticeable with averted vision. Seems like a good candidate to hunt down with the telescope.

The Coathanger

From: 2005-08-29 21:34 UT
To: 2005-08-29 21:47 UT

By pure chance, while sweeping the area around Sagitta and Vulpecula, I stumbled upon The Coathanger. I was aware of this asterism from books but hadn't recently taken note of its location was it was a delightful surprise to stumble on it by accident. While it does sound terribly obvious it really does look like a Coathanger.

Having located it once I was very easy to locate it again in the binocular. It really is a nice sight in the binocular.

At 21:45 UT, while looking at it in the binocular, a meteor went right through the middle of the field of view.

Finished off by making a rough sketch. Note that all I did was try and draw the stars of the Coathanger itself, I didn't bother to try and draw any of the other stars in the field.

Sketch of The Coathanger

Quick look at M13

Time: 2005-08-29 21:52 UT

Had a quick glance at M13. It appeared to be stunningly bright tonight. I wanted to make a sketch of it as it appears in the binocular but, as I was getting the drawing gear together, some cloud moved into the area making it less obvious. Decided to leave the sketch for another night.

M39

Time: 2005-08-29 22:02 UT

Went hunting for and found M39 in Cygnus. Very obvious grouping of stars. Easy to find thanks to four stars, more or less in a line, close by. Best description I can give is that it looks like a loose collection of stars in a roughly triangular shape.

Double Cluster in Perseus

Time: 2005-08-29 22:19 UT

First noticed a "fuzzy patch" in the sky between Cassiopeia and Perseus with the naked eye. Check on charts what's there and realised that it's the double cluster of NGC 869 and NGC 884 in Perseus (also known as Caldwell 14).

Had a look with binocular. Excellent sight. The best description I can think of is that it's two star-rich groups of stars, close together, and made more spectacular by being in a pretty star-rich field anyway. Also noticed a really nice arc of stars heading away (roughly North I think) from the pair.

Mars, and end of session

Time: 2005-08-29 22:30 UT

By now more cloud was forming and rolling in. Decided to pack up. Just as I was packing up I noticed that Mars had risen some way above the houses to the East of me. Very bright and an obvious red tint to it. Nice to see that it's rising earlier and earlier. Just a couple of weeks back I didn't notice it until around 22:55 UT. It's starting to get to the point where there's no excuse for not getting the 'scope out and starting to observe it.


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Dave Pearson <davep@davep.org>
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