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All observing logs tagged with Delta Persei

2007-11-01


Location: Billingborough (South Lincolnshire, UK)
From: 2007-11-01 19:21 UT
To: 2007-11-01 20:09 UT
Equipment: Naked Eye
Antares 905
Temperature: 12.3C ...
Dew Point: 9.6C ...
Humidity: 84% ...
Wind Speed: Calm ...
Pressure: 1028.6hPa ...
Notes:

Went out with the Antares 905 to get my first view of comet Holmes via a telescope.

Fairly clear night. No Moon. Bank of cloud visible to the west.

Comet 17P/Holmes

From: 2007-11-01 19:21 UT
To: 2007-11-01 20:09 UT

I quickly got comet Holmes in the 905 using the 32mm eyepiece. A very impressive sight. Large coma with an obvious bright patch in the middle, fading a little further out and then appearing brighter again towards the edge.

Despite some reports that I'd seen elsewhere I could see no hint of any sort of tail.

I added the Neodymium filter to see if it might help bring out any more detail in the comet. It did seem to reduce the "glow" of the background sky a little but I wouldn't have said I could see any more detail in the comet.

Next I switched to the 25mm eyepiece. The view didn't look that much different in terms of what I could see of the comet. The coma looked a little more "circular" with averted vision than without and I did get the impression that one side of the comet wasn't quite as bright as the other.

After a switch to the 10mm eyepiece the view was still good and it was now more obvious that the outer ring of the coma wasn't the same brightness, it was now very obvious that one side wasn't as bright as the other. This gave the impression that I was looking at something that had leading and trailing edges.

With the 6mm eyepiece (and with the Neodymium filter now removed) it was still a very impressive sight. The coma filled a large part of the field of view. The overall impression was still that there was a central bright era within a bright ring and the area between the two being less bright. I also started to notice that there was a hint of blue to the comet.

Even at this magnification, and also at the other magnifications mentioned above, there was no hint of a tail.

Looking at the comet with the naked eye I noticed that, compared to other recent views, the comet seemed a little more "fuzzy" than I'd noticed before. Also, once again, I estimated the brightness to be something close to Delta Persei.

Overall I felt that the best view was with the 32mm eyepiece. Via that there was a very definite sense of viewing a ghostly 3d ball of "smoke".

By 20:09 UT the sky was starting to get quite misty, it was obvious that the view was more "milky" as seen via the 'scope. So, given that things seemed to be going downhill and given that I'd have a good look at the comet I decided to call an end to the session.


2007-10-31


Location: Billingborough (South Lincolnshire, UK)
From: 2007-10-31 21:25 UT
To: 2007-10-31 21:45 UT
Equipment: Naked Eye
Meade 10x50 Binoculars
Temperature: 10.6C ...
Dew Point: 8.1C ...
Humidity: 85% ...
Wind Speed: Calm ...
Pressure: 1025.1hPa ...
Notes:

Another evening where I was busy with other things while it was clear out. Given that I had a little bit of free time I wandered out with the Meade 10x50 binocular to have a look at comet Holmes.

Pretty fine night, a small hint of mist. No Moon.

Comet 17P/Holmes

From: 2007-10-31 21:25 UT
To: 2007-10-31 21:45 UT

With the naked eye comet Holmes looked more or less the same it did during my previous observation. At a rough guess I'd have said that the brightness was again similar to that of Delta Persei.

With the binocular the view was a little different to that of two nights ago. While the overall view was the same the variation in brightness that I'd noted seemed press pronounced, less obvious.


2007-10-29


Location: Billingborough (South Lincolnshire, UK)
From: 2007-10-29 20:50 UT
To: 2007-10-29 21:10 UT
Equipment: Naked Eye
Meade 10x50 Binoculars
Temperature: 7.4C ...
Dew Point: 4.3C ...
Humidity: 81% ...
Wind Speed: Calm ...
Pressure: 1011.6hPa ...
Notes:

Since first hearing about its outburst I've been unable to observe comet Holmes. Tonight was quite clear but I was out for the early part of the evening. After I got home I headed out with the binocular to have a look.

Comet 17P/Holmes

From: 2007-10-29 20:50 UT
To: 2007-10-29 21:10 UT

When I got outside I noticed that there was a huge bank of cloud heading in from the west. By the looks of things I only had 15 or 20 minutes to observe before the cloud would be a problem.

Even to the naked eye it was obvious where the comet was. It was obvious that Perseus contained a (slightly fuzzy looking) star that shouldn't be there. I roughly estimated its magnitude to be around that of Delta Persei.

With the binocular the view was very different. The comet was a large, circular fuzzy patch, somewhat reminiscent of a planetary nebula (albeit brighter and bigger than any I've observed before).

I could make out that the brightness seemed to vary slightly over the diameter of the comet and that it looked a little denser out towards the edge.

Ideally I'd have liked to have gone on to get the 130M or the 905 out to have a better look but, sadly, by 21:10 UT the bank of cloud had moved in and I could no longer see the comet.


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Dave Pearson <davep@davep.org>
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