An Impromptu Session

Pasted from the observation report section of Stargazer’s Lounge. . .

When I arrived at my usual campsite in Shropshire on Monday night, I wasn’t actually expecting to do any astronomy as the forecast wasn’t great, but as I turned my engine off, and turned the van lights off, I was greeted by a wonderful clear sky, with the Milky Way stretching overhead. So without further ado, I set the dob up, (which takes thirty seconds, such is the genius of the dob design).
I find when I’m in the sticks, (my caravan is at a Bortle 4 site), the Telrad finder is mostly all I need these days. The 10X erecting finderscope I have alongside it is only really needed when I’m closer to town, and I can’t see the stars I’m hopping from. For these observations I used a 28mm eyepiece, unless I say otherwise. I don’t know the field of view, (I don’t even know the correct focal length of my scope, but you can see it’s quite long, about five foot). I find the 28mm fine for deep sky stuff.
So, with no plan in place, I started with M57, the Ring Nebula, and it was pleasingly bright. I often overlook M56 – a quite bright globular nearby. I remembered to check it out this night and it’s easily findable in a ‘line’ with stars to the left of the ‘squashed box’ of Lyra.
M71 next, and this is fast becoming one of my favourite globulars, probably because it looks so unlike a globula cluster. The 10” mirror really does it justice, but this is on Messier object that can be disappointing in small scopes I think, (note to self, look up what H20 is, it’s right by M71).
Just up to the left of Sagitta, I hopped to the easily findable dumbbell nebula. Very bright this evening and the ‘misty bow tie’ shape easily discernible.
Hercules was heading west, and I visited his two showpiece globular clusters, with M13 really burning brightly. I’ve only been using the 10” mirror for a few months, the previous five or six years I’ve been using an 8” Skywatcher, and in terms of gathering light, there is a very noticeable difference. Does anyone know how much more light a 10” mirror finds, when compared to an 8”? There must be a formula, (I’m rubbish at maths).
Saturn’s moons. Last time I had an observing session I made the mistake of not noting the time down when I made my sketch of the background ‘stars’. I didn’t make that mistake this time. I sketched the planet, and every nearby point of light I could see, to check with Stellarium when I got back home, (which was a few days later).
I was pleased to see that along with Titan, I’d seen Rhea and Dione with the 15mm eyepiece. Dione was very much just on the verge of visibility. I had to use averted vison, and it only really appeared when the air steadied.
The Saturnian moon project is on-going. I wish I’d used a 9mm eyepiece now.
M31 was an easy naked-eye object, and I spent quite some time on M110 again. It’s quite bright when you get under a nice dark sky, and I’ve had several pleasing views of it this year.
M11, the Wild Duck cluster is always a treat. The duck I can see is different to how other people see it I think. But it’s such a bright pretty cluster, which you couldn’t confuse with any other. It’s easily found in the Scutum Star Cloud, (yea, I know it’s all easily found if you use a go-to, but where’s the fun in that?).
Yes, I’d insert a smiley there if |I used them.
Ursa Major was quite low, and I tried for M97 and M108 in the same field of view. I saw these together earlier in the summer and it was a real treat, but I couldn’t find a single deep-sky object in Ursa Major on this evening, and it was due to the constellation being low in the bright western sky. I couldn’t even find M51, (I didn’t try for Bodes). In fact,  after looking at Scutum, then turning the scope to Ursa Major, for a split-second  I thought something had gone wrong with my scope! Where have all the stars gone!
By this time Jupiter had appeared from behind a tree and all four Galilean moons could be seen, two on each side. Because I’d been trying to find galaxies in Ursa Major, the bright light of Jupiter was a bit of a shock to my eyeball.

Up till now I hadn’t got my maps out, so I pulled out my Webb Deep Sky Society Star Atlas and looked at Hercules, which – although quite low, was certainly in a ‘sweet spot’ of dark sky. So I look at page eight and there’s a galaxy – NGC6207 -just above M13, (below in my scope). I wasn’t hopeful, because I have a splendid failure rate with NGC galaxies. But, there it was, and quite unmistakably bright. It looked to be ‘pointing’ to the great cluster, and when I re-checked my map, yes, it was a spiral, and pointing at M13. How had I never seen this before? I must have looked at the Great Cluster hundreds of times over the years. 
The Webb star atlas doesn’t give magnitudes, and I was off-line so the only way I could find the magnitude of this galaxy was to text an astro-buddy from the Wolverhampton Society.


The text told me it was 10.08 mag, which is the Wikki version. I was somehow disappointed it wasn’t dimmer. I didn’t have my observing reference books with me, so it wasn’t till this afternoon I found James O’Meara has included this object in his Secret Deep book , (object 73). He puts it at 11.6, (‘a tiny spiral wonder hiding in the shadow of M13’). I have had conflicting magnitudes before, and whatever the magnitude is (I’ve also found mag 12.00 on-line, any advance on twelve?) – I think it’s one of the great secrets of the summer sky. A nd what a great reference point this would be, a test as to the darkness of the summer skies? Could it be seen in the true summer, when there is no astronomical darkness? I’m looking forward to finding out. Galaxy NGC6207 isn’t included in my Nortons 2000 by the way.
I spent more time with M31, trying to see some dust lanes, and trying to be honest enough with myself to admit – erm. . .no. But I did go back to my Webb book and check out anything ‘new’ for me to see there, and there’s a very large open cluster NGC752. This also has a Caldwell number – 28. And it’s a real treat! Overall mag 5.7, and in my 28mm eyepiece it sat beautifully in the field of view, filling the eyepiece. I’d say the stars are pretty similar in appearance, and evenly spaced. It made me very happy to add this cluster and the galaxy in Hercules to my observation list, and I look forward to visiting them again.
After about an hour and a half’s observing, I got cold (I wasn’t really dressed for observing), and hungry. And with the caravan heater on, I retired, about 9.45, with the Pleiades rising above the treeline, leading the way for Taurus, Orion and the winter promise of more deep sky treats in the coming months.

First Light at a New Site

From Stargazer’s Lounge Observation Report section. . .
Last night (Sunday 3rd Oct) was my first night observing at a new site in the Shropshire hills, joining an observing weekend organised by Wolverhampton Astronomical Society. The gang had already had excellent skies on the Friday and Saturday, but would Sunday night shape up as splendidly?
When I arrived, the rain was torrential with 100% cloud cover right up till sunset, but the forecast was hopeful for the evening, and even though I felt skeptical, it did indeed clear and the seeing for the first hour or so was simply stunning. I was pleased to finally take the ‘toilet tent’ off my 30 year old Dark Sky 10″ mirrored reflector on a dobsonain mount, (and mostly used a 35mm eyepiece for the deep sky objects). 
I had prepared a hit-list of fainter Caldwell objects, but as soon as I saw the Ring Nebula at dusk, I knew the seeing was so good that I’d better take in the brighter deep sky objects with this rare chance of near-perfect seeing, the rain having bought down so much muck from the atmosphere.
Really, what is the best thing to do when faced with a great sky at a dark-sky site? Look for the fainter objects you’ve never found, so you can tick more objects off your list, or just look at the old favourites and see them at their best, and take in any new details?
I went for the latter, and I’ll first mention two objects I found very impressive tonight. M110, a satellite galaxy to M31, (the great Andromeda galaxy). I’ve never before seen M110 so well defined. Tonight, I’d say M110 was as well defined as M31 appears on an average clear night at the society observatory (seven miles from Wolverhampton). I’ve never seen it so bright.
 The other big ‘”wow” of the evening was the Perseus Double Cluster. I think I probably look at this at every observing session I do, but I can’t remember seeing it so beautiful as it looked tonight. Simply breath-taking, and surely one of the finest deep-sky object in the northern hemisphere in these conditions. This night, the two clusters seemed to burst out the eyepiece.  A myriad of bright stars, and there’s the ‘pawprint’ and ochre coloured star in the left (right) cluster. Glorious!
I visited M71 in Sagitta. Some find this cluster underwhelming but it’s well worth visiting I think. At first view it’s a ghostly smudge, but further viewing reveals a pretty mottling of stars. I spent years looking for this in urban skies, perhaps that’s why I’m always so happy to see it out in the countryside?
The Dumbell Nebula was also easily found just up to the left of the arrow Sagitta, the shape clearly definable.  
I saw quite a few globular clusters this night, but two pretty, sparse open clusters I always enjoy are M103 in Cassiopeia, and M29 in Cygnus. The former has a triangular shape, the latter I allways think of as an anvil shape. Both are very easy targets for star-hopping.
Ursa Major was low, but it was testament to the great seeing conditions that M51 and its companion was easily found, and had observable structure. M101 also evident in the 10” mirror, but ghostly and faint. I spent some time with M81 and M82 (‘Bodes Galaxy’ and the ‘Cigar Galaxy’), and they were also easily observable in Robin’s 15×70 bins. In the bins, it was more apparent that M81 is the brighter of the two, (some books giving it a full mag brighter). These are lovely objects, and I struggled to find them initially in the dob, which I put down to Ursa Major being so low. It looks bigger, and I got a little confused with distances.
We had summer and winter constellations tonight. Hercules was easily visible, and the Milky Way looked magnificent overhead. I took in M13, (wonderfully bright), and M92. The Wild Duck cluster was easily found to the right of the Scutum Star Cloud, and easily completely resolvable. This is getting to be one of my favourite objects, though the 10” mirror does tend to do it justice. We also saw this through Robin’s bins, and it was bright and structured and the contrast was lovely.
With such good conditions, it’s always worth going for M33, the Whirlpool Galaxy. It always surprises me how big it is. It was easily found with my 10x50s, but the best view came from Robin’s bins which were so comfortable to view through on his parallelogram mount. It’s always surprising how big this is.
Under Jupiter, in Capricorn is an 8th mag globular star cluster called M30, which I’d never found before, and seeing as we were in a slight valley, I thought it might be too low to find tonight. But in the bins, from Jupiter down, I was able to star hop down the four star diamond shape to a crescent of stars in Cap. Which kind of point to where the cluster is, and bingo! A quite small globular compared to M13, but it was very pretty and I expect much brighter for people nearer the equator. M30 is approx. 26,000 light years away.
The seeing deteriorated somewhat with a slight mist, and dew on the eyepieces became problematic, but I stuck at it. Saturn showed no shimmering at all, despite its low altitude. This was thanks to the rainfall I assume. I used a 9mm eyepiece to hopefully find some moons. I sketched a triangle of ‘stars’ to the left of the planet around 9pm. These moons were viewable at high power and likely Rhea, Dione, Titan, and Iapetus. But I can’t confirm these because I neglected to note the exact time. So I need to be more exacting on the Saturnian lunar deal.
I never miss the Ring Nebula (M57) during my summer observations, but I hardly ever visit M56, the globular cluster that’s so easy to find between Albereo and the stars of Lyra. It’s quite bright and very easy to find by star-hopping.
Alberieo looked lovely as always, (though oddly I didn’t find the colours as striking as usual).
The great thing about group observation sessions is – you can get other people’s opinions on objects. I love the Cygnus star HIP 99675 and its two ‘line of sight’ neighbors, because of the colours. I see (left to right in the reflector’s eyepiece), silver, gold and blue. Without telling them what I could see, I asked Robin and Duncan what colours they saw..
“Silver on the left, gold then blue”
And Duncan..
“I can see Silver, gold and … blue”.
So it’s not just my imagination! Such a pretty sight.
All through the evening, Capella was shining brighter, and rising. And soon, there were the Pliades, Alderberran, The Hyades and the Twins Castor and Pollux. What a wonderful time to observe October is! The summer constellations of Corona Borealis, Bootes and Hercules can be seen heading westward, and the winter constellations rising in the east. We started with the Summer Triangle overhead, and at 2am Robin was taking pictures of Orion and M42. What a superb evening’s observations, which seemed very unlikely to even happen at 7pm as we were battered by rain, wind and overcast with 100% cloud cover.
As Chuck Berry sang, “it goes to show you never can tell!”