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All observing logs tagged with Sunspot 897

2006-07-02


Location: Billingborough (South Lincolnshire, UK)
From: 2006-07-02 13:00 UT
To: 2006-07-02 13:05 UT
Equipment: Solarscope
Temperature: 29.9C ...
Dew Point: 16.3C ...
Humidity: 43% ...
Wind Speed: 1.3mph ...
Wind Dir: South East ...
Pressure: 1017.3hPa ...
Notes:

Very hot day with some thin cloud about. Very slight breeze with the occasional short gust. Took the Solarscope out to do a sunspot count.

Sun

From: 2006-07-02 13:00 UT
To: 2006-07-02 13:05 UT

Active area 897 was just visible but appears to have faded even more. I could just make out 4 very faint spots. By the looks of things I won't be able to see any evidence of it in the Solarscope within the next day or so.

Active area 898 still looked very strong. The main spot still looked very crisp and well defined. The umbra still looked very dark and the penumbra was well defined and appeared at least as "wide" as the diameter of the umbra.


2006-06-30


Location: Billingborough (South Lincolnshire, UK)
From: 2006-06-30 13:15 UT
To: 2006-06-30 13:20 UT
Equipment: Solarscope
Temperature: 28.4C ...
Dew Point: 12.2C ...
Humidity: 37% ...
Wind Speed: Calm ...
Pressure: 1021.5hPa ...
Notes:

Very warm, clear, calm day. Some thin cloud around but nothing to get in the way. Took the Solarscope out to do a sunspot count.

Sun

From: 2006-06-30 13:15 UT
To: 2006-06-30 13:20 UT

Active area 897 was still visible but each of the spots in it seem to have faded a little when compared to yesterday. I could count 5 spots in the area (which is actually 1 up on yesterday — probably helped by better conditions today).

The main spot in area 898 still looked crisp and strong with a very dark umbra and quite a thick penumbra. I could still see a second spot in the area which was still much smaller and fainter than the main one.


2006-06-29


Location: Billingborough (South Lincolnshire, UK)
From: 2006-06-29 13:30 UT
To: 2006-06-29 13:39 UT
Equipment: Solarscope
Temperature: 25.4C ...
Dew Point: 10.8C ...
Humidity: 40% ...
Wind Speed: Calm ...
Pressure: 1019.9hPa ...
Notes:

The day started off very clear but, by the time I got out with the Solarscope to do a sunspot count, plenty of cloud had started to gather. The count had to be done in fleeting clear moments.

Sun

From: 2006-06-29 13:30 UT
To: 2006-06-29 13:39 UT

Active areas 897 and 898 were both nicely visible without any trouble. I could count 4 spots in 897 (down 1 from yesterday), I got the impression that the whole area had faded a little too.

Area 898 still had a the large spot I could see yesterday, the umbra appeared very dark, the edges look quite sharp. It is still surrounded by a very obvious penumbra. I could also see a second spot in the area, much smaller than the main one.


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.


2006-06-27


Location: Billingborough (South Lincolnshire, UK)
From: 2006-06-27 14:35 UT
To: 2006-06-27 14:42 UT
Equipment: Solarscope
Temperature: 19.6C ...
Dew Point: 8.9C ...
Humidity: 50% ...
Wind Speed: 0.8mph ...
Wind Dir: North ...
Pressure: 1019.1hPa ...
Notes:

As with the past few days (my last chance to observe the Sun was 4 days ago) today has mostly been overcast. For a short while the cloud broke up a little giving some hazy gaps. I took this opportunity to take the Solarscope out to do a sunspot count.

Sun

From: 2006-06-27 14:35 UT
To: 2006-06-27 14:42 UT

Only one active area was visible (897). I could make out 4 spots, one that was reasonably obvious and three fainter. None of the spots were very distinct. I also observed some faint darkening within the region. Other than that it was quite hard to see any real detail due to the hazy conditions and thin cloud getting in the way.


Page last modified: 2013-04-09 09:19:19 UT
Dave Pearson <davep@davep.org>
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