The title says almost everything. The darkness was excellent yesterday in Val Visdende, perhaps more than 21.70 (4 SQM readings ranged between 21.66 and 21.76 to 21.60 with some reading but also some more than 21.80. Some small trace of light pollution was visible in the South A middle way between the two situations described in that article (on the plain was very dark).
In the winter Milky Way could capture different degrees of intensity that made her seem a stretch when you consider the very large offshoots. The band Zodiac / Leo was in Gegenshein evident as a light to the rest of the sky above and below, then south to the horizon the glow of light pollution would intervene in the Po to 100 km!). Initially, a few passing clouds probably was dimly lit by the lights of Santo Stefano di Cadore and Sapphire, the two most important towns in the vicinity (of sight). It 's hard to say how much light pollution (21.70 is still two-tenths from perfect) coming from the plains to 100 km and that from these two centers.
The initial temperature was quite mild, around a few degrees below zero and this was maintained for most of the night. But to the early hours of the morning fell quite rapidly to -11 ° C. The road is clear in the part that leads to the valley, with bends and stretches of a certain slope. In the valley and icy roads were partially innervated, but fortunately the roads in the valley are almost flat. The seeing was not great. Towards the middle of the night observing Saturn and blurring in extrafocale was possible to see the effect of cascade sign of turbulent layers at high altitude. But say I do not know if they were high layer or the area of \u200b\u200bwind recirculation that forms when the wind comes off the ridges of mountains (the seeing was good perhaps elsewhere). To make matters worse there was also cold, and the resulting convection currents on the optics. I noticed that the 60 cm, even if it adopts the same system of extraction of the boundary layer of 40 cm, it is slower and more gradual improvement in the quality of the image (I think that can be used perhaps two or three hours to reach the ideal situation).
Lost in a valley with no signs of life (not passed no one and there was a house that seemed inhabited), with the reassuring shape of Peralba to the east and the last larch and spruce that stood out as black silhouettes against the sky northward, the participants in the mini star party were placed near a tavern where there was a bit 'of unobstructed area from the snow.
The fearless are the order of the diameter of the telescope
winner: I myself with the leviathan from 60 cm.
Secondi classificati ex aequo: Tommaso e Fabio, con due dobson da 40 cm.
Quarto classificato: Andrea, con un dobson da 30 cm.
Quinto classificato: Pierpaolo, con un CPC 8" goto (orrore un GOTO nella tana dei puristi!).
Ultimo classificato: Marco, senza telescopio ma abile allo scrocco dei telescopi altrui, con il grave demerito di aver portato un computer nella tana dei puristi (peggio del GOTO) ma perdonato per la sua abilità a rintracciare il più remoto oggetto.
La considerazione generale di questa, che è la quarta uscita con il 60 cm è: "la differenza è grande".
Ho esordito con un'occhiata alla Testa di Cavallo, visibile con filtro H-Beta a 142x, as a large bend in the edge of the borders nebuolsa not very accurate. You could not see the shape of the head but do not despair because I was looking in one direction a little 'polluted and height less than ideal.
The thing that left a mark at all is the way in which galaxies are seen. Almost all show details, spirals, stripes, etc..
M51 is literally "stratospheric." Observed from about 100x (with the eye 30 mm) to about 300x (with a Pentax 10.5). Too bad for seeing the vision otherwise would probably have been better than a 300x. The spirals are visible without any effort. Are not vanishing: indeed showed several reinforcements. You could sense offshoots of the halo in different directions, Follow the bridge between the two and see the break.
not mention all the observed objects. Only a few more thing to point out that you can see in the sky at 60 cm from a two tenths from perfect.
Leo I. The dwarf galaxy Leo. It 'an object of low surface brightness difficult to view because near Regulus. Regulus by putting off the brightness of the galaxy was evident, especially by moving the telescope. Once identified remained visible even when regulation entered in the field of view.
NGC 4631 (Whale). was seen as very bright. One can distinguish (unlike that in the 40 cm) several condensations in the galaxy main the companion and the enlargement of the head of the whale. The two interacting galaxies in the vicinity were as rich in detail.
M61 appeared to be resolved as a beautiful spiral. A small M101. And M101 is another object that has attracted the attention of all: The spirals could be seen throughout their course, with several condensations of stars and the deformed portion that extends from one side. We also saw dioverse field galaxies nearby.
the end product also M13. Apart from the clear difference in brightness and number of stars, this time the small galaxy IC 4167 was obvious, even as a template, while the NGC 6207 also show internal structure.
Notes Marco
The first thing to say is that I still find it very difficult to pick up the tall objects. The scale is not an issue to watch, but the point is, why do I have to look in the finder often lean too dangerous positions. However, the objects I've seen, in all instruments, were many: counting all individual galassiette are seventy. This is because many small galaxies are close to other noble and so are free. Points particularly to the Galaxy "lumps" at the Windmill NGC 5477, NGC 4488 and the bar near the M49.
The Sombrero was spectacular and seemed to me as I'd like seen in Namibia, but obviously the quality of the air and 10 cm difference (remember that there had to hire a 50 cm) were compensated a bit '. It also tells the little-known hydro NGC 3109, which is the most peripheral of the local group galaxy. It 's a long uneven brightness from very low, but large in size (20'). The chain
Markarian I spotted both with 40 cm with 60, even if in a hurry. Add
also a curiosity for the first time I used a planet as a starting point for the star-hopping, that I used as reference to find the Saturn beautiful M61. This is also a galaxy unjustly neglected, perhaps because it is a few degrees off from the 'crowded' main di Chioma-Vergine, ma è sicuramente più meritevole di molte delle singole componenti dell'ammasso.
Morale finale: con questo fantastico telescopio concetti come "visione distolta" o "intravedere" sono solo un lontano ricordo!
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