Ho scelto questo titolo per indicare la situazione di ieri. Siamo stati in Val Visdende. Nella prima parte della notte ci sono stati dei veli che scendevano da Nord. Verso le 10 di sera si è aperto. Sembrava fatta ma dopo circa un'ora abbia visto la nebbia che risaliva minacciosa la valle, e in breve siamo stati inghiottiti. Qualche piccolo sprazzo qua e là, con le stelle che ancora si vedevano ma nella nebbia. Poi verso le due e mezza di notte si è di nuovo ripulito il cielo e abbiamo avuto un'altra oretta e mezza di osservazioni. Metà bene, metà male.
Ma almeno abbiamo salvato l'uscita.
Quando era bello lo SQM segnava 21.40 (Before midnight) and 21.50 (3 am). Visibviule in M33 was averted when it was high in the sky before midnight, while it was easier at 3 at night, even though it was lower. In the South Fork
we have seen the full range of light pollution. Before midnight veils and high luminescent (premsumo illuminated by the Friuli plain between 60 and 120 km S; there is hardly anything more closely). With the fog became too dark fork (probably because there was fog in the lowlands). A little 'was not sufficiently transparent, a bit' has been very transparent and you could see faint stars of constellations southern horizon. The temperature dropped
around zero or a couple of degrees (a situation I would call "hot").
The seeing was bad. It 's easy that it is because the valley is like a bowl surrounded by mountains and it is virtually impossible not to be sottovento.Giove was observable on the 260-280X but was confused. The fuzzy red spot and, above all, it was enough to extract a little 'fire to recognize the classic "waterfall", a sign of turbulent layers at high altitude (which I think were not very high).
Turning to the comments, the program was a bit 'limited disruption of fog.
We started with a comparison to NGC6946 between 60 cm and 40 cm of Thomas. (PS we were in fourth with three instruments: Me and Mark , 60 cm, with 40 and Thomas with Fabio 40. Dobson all three of Zen). While in approximately 40 to 200x, thanks a sky still imperfect, was "fantasy" in 60 to 265x was brighter. The spirals were more easily visible and the outer spiral towards S could also see some reinforcements. But we've also seen better on other occasions. I tried unsuccessfully
Humason 1-1 in Cassiopeia. This is a stellar and planetary aspect almost escaped me. I then folded up
Abell 2, still in Cassiopeia, which appeared as a faint disk, both semnza filters with both filters (in my opinion the best view was with the UHC).
We moved to more substantial items, such as NGC 40 and NGC 7354, two planetary in Cepheus. NGC 40 showed the central star, the outer shell elliptical, and a kind of dark ring between the center (surrounded by what appeared to be a bit 'of nebulosity) and the shell. A little 'as in the photo link.
NGC 7354 is more compact and instead appeared as a bit 'uneven. A little 'as in this photos but more faint (and no color!).
During one of the bursts is not fully transparent, I repeated the tests with colored filters on the M42. I used the filter W23A, Halfa, which isolates the emission of the nebula (the half-pass at 98%, while the other emission lines, OIII, etc. Hbelta not pass, see this article). Was visible an area a bit 'smaller than marked in orange. In practice, the central part of the nebula is intense enough to be visible in Halfa (in Halfa) - and was saturated red, but still very weak. Obviously the green is hugely more intense for the eye (not absolute Halfa is more intense because the OIE). Red, the weaker parties (those in which some observers say they still believe that colors are real), not even the shadow. Experience with a red filter is one thing to try: the rods are insensitive to red and what is seen is seen only with the cones. You must use the direct vision and how you live in a dark space where some objects become visibili quando capita di fissarli direttamente.
Nelle "nebbia" abbiamo osservato Giove (niente di speciale visto il seeing che ho detto), mentre Marco giocava a carte con il PC.
Di ammassi abbiamo osservato M35, con alcune stelle colorate di rosso, eNGC 2158, risolto finem,ente in stelle a 265x (nel frattempo lo specchio si era acclimatato grazie al sistema di estrazione dello strato limite).
Osservata anche la cometa: una grande nuvola, molto luminosa sofficie e senza particolari dettagli. Era in Monoceros.
E' stata quindi la volta di IC 434 e della Testa di Cavallo. Era la prima volta che osservavamo la testa di Cavallo con il 60 cm. Se con il 40 è sempre stata elusiva, apparendo al massimo come una indentazione on the edge of a faint band of light, with 60 (I always filter Hbeta) the nebula was well defined and the head looked like a hook-shaped bay. Just this evening, perhaps to save the unfortunate half.
to close (it was nearly 4 am) look at NGC 2438, M46 superimposed on the planet. By comparison of some planetary ghosts, was clearly visible, large, bright, ring-shaped with the central star (which is not the central) and another star at the edge visible. Maybe a little 'worse than I've seen the Giau in February. Yesterday I
