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All observing logs that mention sunspot 798

2005-09-13


Location: Billingborough (South Lincolnshire, UK)
From: 2005-09-13 10:20 UT
To: 2005-09-13 10:31 UT
Equipment: Solarscope
Naked Eye
Notes:

Another look at sunspot 798 with the naked eye and with the Solarscope. Sky wasn't too bad again today — just a little hazy.

Sunspot 798

From: 2005-09-13 10:20 UT
To: 2005-09-13 10:31 UT

First looked for sunspot 798 with naked eye and eclipse shades. It was very easy to see as a rather large dark spot.

In the Solarscope it was obvious that the shape of the spot had changed a lot from yesterday. Although the following sketch gives the impression that it's smaller than yesterday it actually seemed to cover slightly more area than I remember from the previous observation.

Made the following sketch:

Sketch of Sunspot 798

Location: Billingborough (South Lincolnshire, UK)
From: 2005-09-13 21:55 UT
To: 2005-09-13 23:00 UT
Equipment: Sky-Watcher Explorer 130M
Notes:

Given that the sky was reasonably clear and that the forecast for the next few days didn't look too good I decided to have a quick session looking at Mars.

Conditions were slightly warm and breezy with the Moon just past 1st .

Mars

From: 2005-09-13 21:55 UT
To: 2005-09-13 22:49 UT

Mars was still quite low. There was also a hint of haze in the air which seemed to dim it slightly. After first locating the planet with the 25mm eyepiece I switched to the 10mm eyepiece. The image was quite washed out and was dancing around quite a bit. Initially about all I could make out was that there was a visible phase.

The breeze calmed down for a moment so I switched to the 10mm with 2x Barlow. As normal I struggled to get useful focus with the Barlow and also noticed that there was some significant false colour around the image of Mars.

Switched to the 6mm (with no Barlow) and the image was much crisper. Mars appeared very bright, even to the point that I was getting four very obvious spikes off it. In steady moments there was a hint of surface markings visible. As with a few nights ago, these appeared as vague differences in colour.

Added the #21 Orange filter to the 6mm eyepiece. This reduced the glare of the image, the surface looking less washed-out. The hint of markings seemed to improve although they didn't improve to the point that I'd have been able to draw a reliable sketch. They were there, visible but also somewhat indistinct. The fact that the image wasn't terribly steady most of the time adding to the problems.

Next gave the #80A Medium Blue filter a go with the 6mm eyepiece. I don't know why but I was initially surprised to see that this made Mars look white, not blue. The markings mentioned above were still visible and, this time, appeared as darker gray areas.

Decided to experiment a little more by combining the #21 and #80A filters. The image looked more or less the same as it does with the #21 filter on its own although I'd be tempted to say that the darker areas appeared a little easier to notice — although still somewhat indistinct.

Also tried the #56 Green filter with the 6mm eyepiece. Other than making Mars look somewhat green this didn't seem to make an awful lot of difference to the image.

M45

From: 2005-09-13 22:57 UT
To: 2005-09-13 23:00 UT

Because it was close to Mars and is also an easy target I decided to have a quick look at M45 — The Pleiades. Had a look with the 25mm eyepiece. Quite a stunning sight through the 'scope. The main pattern of stars more or less filled the field of view.

By around 23:00 UT the breeze was picking up quite a bit and the sky was becoming more washed-out due to the Moon so decided to call an end to the session.


2005-09-12


Location: Billingborough (South Lincolnshire, UK)
From: 2005-09-12 12:21 UT
To: 2005-09-12 12:35 UT
Equipment: Solarscope
Naked Eye
Notes:

First clear day since I last looked at sunspot 798. Took the Solarscope out to see how it looked now. Sky wasn't too bad although there was some whispy cloud about and some general thin haze.

Sunspot 798

From: 2005-09-12 12:21 UT
To: 2005-09-12 12:35 UT

Sunspot 798 looked much bigger and more spread out than my last look at it. The main change in its appearance is no doubt down to the fact that it's now more face-on than it was when I last observed it.

Made the following sketch:

Sketch of Sunspot 798

I also took the following image on the camera in my mobile phone to give an impression as to what my view looked like:

Image of Sunspot 798

Also noticed that Sunspot 809 was no longer visible.


2005-09-09


Location: Billingborough (South Lincolnshire, UK)
From: 2005-09-09 07:57 UT
To: 2005-09-09 09:10 UT
Equipment: Solarscope
Naked Eye
Notes:

Read that sunspot 798 was coming back around the limb of the Sun so decided to view it with the Solarscope.

Sunspot 798

From: 2005-09-09 07:57 UT
To: 2005-09-09 08:25 UT

Sunspot 798 stood out the moment I got the Sun projected in the Solarscope. Quite close to the limb. It appeared to be made up of one large spot with at least five smaller spots around it.

Had a couple of goes at imaging what I was seeing with the camera in my mobile phone (sadly the only instant imaging device I've got to hand at the moment) but failed miserably.

Instead, decided to try and draw a sketch of what I was seeing:

Sketch of Sunspot 798

Sunspot 798 with naked eye

Time: 2005-09-09 08:51 UT

Using a pair of eclipse shades I noticed that sunspot 798 was just about visible to the naked eye. If I'd not known where to look I probably would have missed it due to it being so close to the limb.

Another Sunspot and some images

Time: 2005-09-09 09:10 UT

While having another look with the Solarscope I noticed that not too far from 798 there was another very small spot visible. At first I thought it might simply have been some dust on the lens or the mirror. I rotated both of them to be sure and it didn't move.

Subsequently found out that the sunspot mentioned above now has a number: sunspot 809.

Also had another go at taking some images with the mobile phone. This time they didn't come out too bad. While there's no real detail to them you can at least get an impression of what 798 looks like in the Solarscope:

Image 1 of Sunspot 798

Image 2 of Sunspot 798

Image 3 of Sunspot 798


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