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All observing logs tagged with Rhea

2009-02-07


Location: Woodland Waters (South Lincolnshire, UK)
From: 2009-02-07 21:00 UT
To: 2009-02-07 23:34 UT
Equipment: Canon EOS 400D
Naked Eye
Notes:

Joined John at Woodland Waters for an observing session. Forecast suggested the night could go either so decided to take a chance. I decided not to bother taking a 'scope, assuming that cloud would be turning up. Instead I packed binoculars and my Canon EOS 400D.

This was never going to be a real observing session, more a case of standing in a field, chatting, and looking at stuff when it was available. I left home with clear skies and reached the site to find lots of scattered cloud so packing light turned out to be a good plan.

Random Moon shots

From: 2009-02-07 21:15 UT
To: 2009-02-07 21:30 UT

While standing around and chatting, during the gaps in the cloud, I took a number of hand-held shots of the Moon with my EOS 400D and the its 200mm Tamron lens. Nothing fancy but they turned out okay. Here's an example:

Moon

Clouded Out

From: 2009-02-07 21:41 UT
To: 2009-02-07 22:24 UT

The cloud got worse and by about 21:41 UT we were totally clouded out. This lasted until around 22:24 UT when it started to break up again.

Saturn

From: 2009-02-07 22:25 UT
To: 2009-02-07 22:30 UT

By 22:25 UT some reasonable gaps had started to appear in the cloud and John turned his 'scope on Saturn. I had a look and was immediately struck by how much the rings at closed up since the last view I had almost exactly a year ago. There was a hint of mottling on the disc of the planet but it was difficult to make out much in the way of detail due to cloud coming and going.

Titan was easily visible.

Meteor

Time: 2009-02-07 22:33 UT

While waiting for Saturn to appear from behind the clouds again I was looking in the general direction of Leo and saw a short but bright meteor head roughly west to east just below the constellation.

More Saturn

From: 2009-02-07 22:36 UT
To: 2009-02-07 22:50 UT

Cloud cleared again so back to Saturn.

John noticed what he thought was another moon or perhaps a background star near Titan. I had a look and confirmed that there was a pretty faint object in the position he'd mentioned. I made a simple sketch in my notebook with a view to checking what it was when I got home.

Checking later it would appear that the object we saw was Rhea.

John next spotted another, even fainter, object. This time around half way between Titan and Saturn's rings. Again I looked and managed to confirm the object in the position he'd been looking in. Again, I made a note on the simple sketch in my notebook so I could check what it was later.

Checking later it would appear that we'd seen either Dione or Enceladus. Starry Night suggests that Dione would have been the brighter of the two so I'm assuming that that's what we saw.

The other thing I noticed while observing Saturn, and John confirmed it, was that one side of the rings (the "right" side as seen via the view at that time in John's refractor, the opposite side to the side where Titan was) looked like they were detached from the planet's disk whereas the other side looked like they were attached. Despite the rings being very closed up now it seems that the planet's shadow on the rings was still very obvious.

Later checking confirms that this is where the shadow should have been.

Some photography

From: 2009-02-07 23:00 UT
To: 2009-02-07 23:30 UT

Did a bit of general skyscape/landscape photography, taking in Orion (including picking out M42).

End of Session

Time: 2009-02-07 23:34 UT

Even though the sky had cleared by now the Moon was whiting out the sky and, given that we'd seen most of what was worth seeing tonight, we decided to call and end to the session and pack up.


2007-04-04


Location: Billingborough (South Lincolnshire, UK)
From: 2007-04-04 15:10 UT
To: 2007-04-04 15:15 UT
Equipment: Solarscope
Temperature: 10.8C ...
Dew Point: 4.6C ...
Humidity: 66% ...
Wind Speed: 0.8mph ...
Wind Dir: North ...
Pressure: 1022.6hPa ...
Notes:

Mostly cloudy day. Started to clear some later into the afternoon so took the Solarscope out to do a quick sunspot count.

Sun

From: 2007-04-04 15:10 UT
To: 2007-04-04 15:15 UT

No spots or other marks visible on the Sun.

Location: Billingborough (South Lincolnshire, UK)
From: 2007-04-04 19:19 UT
To: 2007-04-04 20:48 UT
Equipment: Sky-Watcher Explorer 130M
Temperature: 7.1C ...
Dew Point: 2.9C ...
Humidity: 75% ...
Wind Speed: Calm ...
Pressure: 1022.2hPa ...
Notes:

The day cleared further and resulted in a pretty nice evening. I decided to get the 130M out and have a look at Venus with it.

Venus

From: 2007-04-04 19:19 UT
To: 2007-04-04 20:05 UT

I'd put the 130M outside about 20 minutes earlier in the hope that it would cool off enough. Having only used the 905 to observe Venus I was keen to have a go with the 130M.

I first lined the planet up with the 25mm eyepiece. The planet seemed very bright and I could see four huge diffraction spikes coming off it. It was almost impossible to see any shape to the planet itself.

Next I switched to the 10mm eyepiece. I could now see some hint of shape but the planet was still very bright and was still mostly obscured by spikes.

I then switched to the 6mm eyepiece. Despite it being too bright a view still, and despite it still being marred by spikes, I could now easily make out the phase. I was also very surprised at how large the planet looked (the 6mm in the 130M gives 150x magnification).

In an effort to improve the view I placed the end cap of the 'scope back in place and removed the cap from the small aperture. This made a huge difference. The view wasn't anywhere near as bright and I was no longer bothered by spikes (for obvious reasons). While the view wasn't crisp, there was a well defined gibbous phase visible.

Next I added the barlow. The view was very soft with some false colour, not the best view but pretty magnificent when compared to the view via the 905.

I did some more experimenting, adding filters and the like, and found that a good view could be obtained with the 6mm eyepiece (no barlow), the ND25 filter and the cap in place (with the smaller hole open, obviously). While the image was still a little soft around the edges, and gave the odd hint of a red and a blue from time to time, it was a very good view.

As a comparison I then tried the contrast booster and the #80A medium blue filters with the 6mm (still with the cap in place). This also worked well (as I've found on the 905).

In all the experimenting I did none of the images I had appeared to be the sort of image that would allow me to do any sort of "serious" observation, I can't imagine managing to make the sorts of observations that avid Venus observers do. I will, with either 'scope, be able to follow the phase changes though.

At 20:05 UT I finished with Venus.

Saturn

From: 2007-04-04 20:10 UT
To: 2007-04-04 20:48 UT

Given that it was well placed and I had the 130M out I decided to move on to Saturn.

I first got the planet lined up in the 'scope with the 25mm eyepiece and I then switched to the 10mm eyepiece. The view was amazing! Easily as good as, if not better than, the best view I had last year. The Cassini Division stood out right away, there was no problem seeing it. I could also clearly see the shadow of the rings on the planet and the shadow of the planet on the rings. I could also see, without any real effort, some faint banding on the planet itself.

Keeping in mind all the problems I had in the past with the old barlow and the 10mm eyepiece I added the barlow to the mix and looked again. The view was stunning and there was no problem finding focus. There's little doubt that this barlow works far better with the 130M than the one that was supplied with the 'scope.

I then mixed the 6mm eyepiece with the barlow. The view was a little soft but I could see obvious variation in the rings, the Cassini Division stood out and the banding on the planet was still visible.

I noted that this must have been an exceptional sky tonight as I appeared to be getting better and more consistent views than I've ever had before.

Back on the 6mm with no barlow, I noticed to the left of the planet, about a ring diameter away, I could see a faint "star". Checking later with Starry Night is seems that this was Rhea. To the right of the planet, much further out, I could see Titan.

I spent more time just looking at Saturn, watching the really clear moments, the really steady moments, pop in and out of view (and there were many of them). Finally, at 2007-04-04T20:48Z, with some thin cloud starting to get in the way of the view, I decided to pack up for the night.


2007-03-03


Location: Billingborough (South Lincolnshire, UK)
From: 2007-03-03 13:00 UT
To: 2007-03-03 13:05 UT
Equipment: Solarscope
Temperature: 11.1C ...
Dew Point: 5.8C ...
Humidity: 71% ...
Wind Speed: 3.3mph ...
Wind Dir: West ...
Pressure: 1003.9hPa ...
Notes:

Mostly clear day. Took the Solarscope out to do a quick sunspot count.

Sun

From: 2007-03-03 13:00 UT
To: 2007-03-03 13:05 UT

Active area 944 was still visible and looked more or less the same as it did yesterday.

Location: Woodland Waters (South Lincolnshire, UK)
From: 2007-03-03 20:10 UT
To: 2007-03-04 01:12 UT
Equipment: Naked Eye
Antares 905
Meade 10x50 Binoculars
Notes:

Very clear and pretty cold night. Arranged to meet up with John Turner at Woodland Waters to observe the total lunar eclipse. I took along my Antares 905 and a pair of 10x50 binoculars and John brought his Sky-Watcher Explorer 130M mounted on an EQ5 mount.

Saturn

From: 2007-03-03 20:10 UT
To: 2007-03-03 20:50 UT

After setting up I started out with a brief look at Saturn (given that the umbral phase of the eclipse wouldn't be starting for a short while). The first thing I noticed was that seeing seemed to be very steady. The view of Saturn in the 905 with the 6mm eyepiece was nice and sharp.

The shadow of the rings on the planet seemed obvious and I kept getting a good hint of the Cassini Division. Titan was easily visible and, off to the other side of Saturn, closer than Titan, there appeared to be another moon visible. Checking with Starry Night I suspect it was Rhea.

Total Lunar Eclipse

From: 2007-03-03 21:00 UT
To: 2007-03-04 01:12 UT

Having observed Saturn for a while I turned to observing the lunar eclipse.

At 21:04 UT I had the impression that there was less visible contrast between the highland and lowland regions of the Moon. This was especially noticeable on the side of the Moon that was heading towards the Earth's umbra. By 21:24 UT this loss of contrast had become much more noticeable and there was obvious darkening of the part of the lunar surface that was deepest in the Earth's penumbra.

At 21:30 UT the umbral phase started and, very quickly, it was obvious where the umbra was. To the naked eye it looked like part of the Moon had gone missing. Via the 905 detail was still visible in the umbra, it looked like a very dark gray shadow.

I noticed that Tycho had been fully consumed by the shadow at around 21:48 UT. I noted at this point that the umbra seemed very dark (much darker than I remember it looking during last year's partial eclipse), dark gray to almost back looking in places. I also noted at this point that the sky was obviously getting darker and that my shadow was starting to fade.

Around this time I started to take a few afocal images, via the 905, with my mobile phone. Few turned out that well but the following is an example of one of the better ones:

Total Lunar Eclipse

By 22:05 UT we were about way towards totality and I was starting to notice a slight red/brown hint to the umbra. In the 905 the umbra showed no colour, still just a dark gray.

At 22:16 UT, via the 905 and with the 10mm eyepiece, I could see a star quite close to the Moon. This star hadn't been visible before so it seemed pretty clear that a lot of the Moon's glare had gone now. Checking with Starry Night it appears that it was 56Y Leonis (HIP53449, TYC261-384-1).

By 22:32 UT I was starting to see a hint of red/brown colour in the deepest part of the umbra when viewing via the 'scope. The redness was now very obvious to the naked eye. By this point it was looking like it was going to be a reasonably dark eclipse.

At 22:44 UT it was obvious that totality had begun. Although there was an obvious hint of redness to the Moon with the naked eye it wasn't that red. There was an obvious difference in brightness between the part of the Moon that was towards the edge of the umbra and the part that was deepest in the umbra. By now the sky was a lot darker — many more stars were visible, as were the more obvious deep sky objects such as the Double Cluster and M44. I could no longer see my own shadow and, unlike earlier in the evening, I now needed a light to be able to move around safely.

Mid totality was around 23:20 UT. On the Danjon scale I would estimate that the brightness of the eclipse was L2.

At 23:32 UT I observed a short and bright meteor head south of Auriga in the direction of Orion.

By 23:35 UT it was obvious that the brighter part of the shadow had "swung" around to the edge of the Moon that would exit the umbra.

By 23:58 UT the first bright patch was visible to the naked eye, totality had ended.

Around 00:09 UT I took a few more afocal shots of the Moon, via the 905, with my mobile phone. The best of the bunch is this one:

Total Lunar Eclipse

Around 00:17 UT it was obvious that the sky was starting to brighten again. M44 was still visible but much harder to see than it had been during totality. I could also see my own shadow again.

At 00:24 UT, with the Moon about way out of the umbra, some thin cloud started to move in front of the Moon. While it didn't put a stop to observing it was a cause for concern given that thicker could cloud be seen towards the west.

Around 00:36 UT I watched Tycho emerge from the umbra. Also, around this time, I noticed a star pretty close to the lit limb of the Moon (the limb that had already emerged from the umbra). By the looks of things it seemed like it might actually be occulted by the Moon before the Moon was clear of the umbra. I decided to stay at the eyepiece and see how long I could follow the star.

Later checking suggests that I was watching 59 Leonis (HIP53824, TYC268-1064-1). From my location this star would not be occulted by the Moon but would come very close. Western parts of the UK would see an occultation.

At 00:39 UT I noticed that the objective lens of the 905 was starting to badly mist up (this might have started happening some time ago but it was now very obvious due to the glare from the brightening Moon).

The star was still just visible at 00:49 UT, although I now struggling to see it in the glare of the Moon. I carried on watching it for as long as I could and I lost it, very close to the Moon's limb, at 01:01 UT. It appeared to have been occulted (but see the note above).

By 01:04 UT the sky was now very bright again, only the brightest of stars were visible and I could no longer see the naked-eye deep-sky objects I'd been able to see earlier. I could also now walk around without the aid of a torch without any danger of bumping into anything.

I started to pack up during the final moments of the Moon exiting umbra and, at 01:12 UT, I watched the Moon finally move out of the umbra. Now cold and tired we finished packing up and called it a night.


2006-01-11


Location: Billingborough (South Lincolnshire, UK)
From: 2006-01-11 16:51 UT
To: 2006-01-11 16:57 UT
Equipment: Naked Eye
Temperature: 5.5C ...
Dew Point: 1.5C ...
Humidity: 75% ...
Wind Speed: 2mph ...
Wind Dir: West ...
Pressure: 1021.8hPa ...
Notes:

Mark Smith alerted me to a pass of the ISS that was about to happen so I ventured outside to watch it go over.

International Space Station

From: 2006-01-11 16:51 UT
To: 2006-01-11 16:57 UT

The sky was still light, although the Sun had set. I managed to pick out the ISS when it was something like 20 above the horizon (perhaps a little more). At its maximum altitude (around 69) it was very bright, brighter than I've ever seen it before. I also watched it pass about way between Mars and M45.

Location: Billingborough (South Lincolnshire, UK)
From: 2006-01-11 21:22 UT
To: 2006-01-11 23:00 UT
Equipment: Naked Eye
Sky-Watcher Explorer 130M
Meade 10x50 Binoculars
Temperature: 2.0C ...
Dew Point: -0.1C ...
Humidity: 86% ...
Wind Speed: Calm ...
Pressure: 1024.8hPa ...
Notes:

First clear night this year and the first clear night I've had free to observe in a month. The Moon was quite high in the sky, phase was waxing gibbous (about 89% of full). The main aim for this session was to observe Saturn (this would be the first telescope observation of the planet since 2005-05-07.

Saturn

From: 2006-01-11 21:22 UT
To: 2006-01-11 22:10 UT

Got Saturn in the field of view of the 130M, using the 25mm eyepiece with no trouble. Even at such low power the rings were quite obvious. I could also easily see Titan and Rhea. The image was a little unsteady (with some blurring and false colour) but, at this point, the 'scope hadn't really had much time to cool down so I wasn't expecting too much.

Switched to the 6mm. The image wasn't very sharp and was mostly unsteady. However, in steady moments, I was sure I was getting a hint of the Cassini Division.

Decided to play with some of the filters and see what effect they had. Started with the #15 Yellow/Orange filter. With it I thought I could see a good hint of a couple of dark bands on the surface of the planet.

I next tried the #21 Orange and then the #56 Green filters. In both cases I didn't notice any obvious improvement over the view without any sort of filter.

Finally I tried the #80A Medium Blue filter. When using this I'm sure I got a better hint of the Cassini Division than I'd had with any other view.

As a quick test I tried the 6mm eyepiece with the 2x barlow. The view was terrible. This was to be expected as this provides slightly more magnification than the 130M can handle.

I next tried a view with the 10mm eyepiece and the 2x barlow. The view was reasonably good but didn't really seem to show any more detail than any other view I'd had.

A good view of the Cassini Division still eludes me.

Saturn and The Beehive

From: 2006-01-11 22:28 UT
To: 2006-01-11 22:35 UT
Temperature: 1.6C ...
Dew Point: -0.4C ...
Humidity: 87% ...
Wind Speed: 3.5mph ...
Wind Dir: West South West ...

Used the Meade 10x50 binocular to view Saturn and M44 in the same field of view. Looked fantastic! Having spent the best part of the previous hour observing Saturn through the 130M (where the planet was a significant feature in the field of view), this view, with M44 in the field, seemed to make Saturn look very small.

Also noticed that Asellus Australis was nicely framed in the field too. All in all an excellent sight and right in the middle of Cancer.

Moon and Elnath

Time: 2006-01-11 22:36 UT

While looking at the Moon with the naked eye I noticed a bright star close by (about 1 or so away). Against the Moon's brightness it was hard to make out but it was simple to see with the binocular. A quick checked showed that the star in question was Elnath in Taurus

One last view of Saturn

From: 2006-01-11 22:54 UT
To: 2006-01-11 23:00 UT

Decided to have one last look at Saturn before packing up. Used the 6mm eyepiece on the 130M. Had some very steady moments in which I thought I could see a very good hint of the Cassini Division. Also, in this view, the rings stood out really well against the planet.

Also experienced a couple of moments of really bad seeing. This little observation was a really nice example of the "watch and wait" approach to viewing planets. One moment the view was awful, the next it was the best I'd seen it all evening.


2005-05-04


Location: Billingborough (South Lincolnshire, UK)
From: 2005-05-04 20:50 UT
To: 2005-05-04 21:50 UT (approximate)
Equipment: Sky-Watcher Explorer 130M
Meade 10x50 Binoculars
Notes:

Seeing seemed reasonable tonight. No moon.

Didn't get a chance to look at Jupiter as it was obscured by the house early on and by the time it cleared the house cloud had started to roll in from the south.

Saturn

Time: 2005-05-04 20:50 UT

With the 10mm eyepiece on the 130M I thought I could see the faint hint of a band on the planet's disk. Not really sure if this really was there or if my eye/mind was playing tricks on me.

As with previous sessions I kept getting the odd hint of the Cassini Division.

At just before 21:00 UT, while looking at Saturn with the 10mm eyepiece and 2x Barlow, had a meteor pass right through the field!

Titan was obvious and, with the 10mm and 2x Barlow, I noticed another faint point quite close to the planet (I'd estimate a couple of Saturn diameters away in the field). Wasn't sure if I was seeing another moon or perhaps a background star. Checked the following day with Starry Night and it seems that what I was seeing was Saturn's moon Rhea.

The International Space Station

Time: 2005-05-04 21:15 UT (approximate)

Naked eye this time (obviously). While having a break from the telescope for a moment saw a very bright satellite moving West to East, easily as bright as Jupiter. Saw it pass within two or three degrees of Jupiter. As it headed East it dimmed and disappeared from view as it past into Earth's shadow. Suspected at the time that what I'd seen was the ISS.

Checked the following day with Starry Night: yes, it was the ISS .

M44

Time: 2005-05-04 21:30 UT onwards

Had another look at M44 with the binoculars and then turned the 130M on it using 25mm eyepiece. Very impressive. More stars that I'd care to count.

Noticed with the binoculars, reasonably close to M44, there's an asterism of stars in a roughly straight line. Got to wondering if it's got a name.

Did some checking on the web the following day and couldn't find any mention of it. I guess it's not an asterism of note. Checking in Starry Night it seems what I was looking at is comprised of the following stars (plus some others):

If anyone reading this recognises this asterism and knows a name for it I'd love to hear about it.


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