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  4. » CR399 Collinder 399 The Coat Hanger

 
CR399 Collinder 399 The Coat Hanger...

Deep Sky 4

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CR399 Collinder 399 The Coat Hanger sent on July 06, 2019 (16:48) by Marzio Bambini. 6 comments, 334 views. [retina]

L'ammasso fu osservato e descritto per la prima volta dall'astronomo arabo Al Sufi nel X secolo; non fu però riportato né dal Messier, né da William Herschel, né tantomeno dal catalogo NGC, probabilmente perché non veniva considerato un ammasso a tutti gli effetti, data la sua notevole estensione apparente, ma un semplice asterismo. Il primo a catalogarlo fu Per Collinder, che lo inserì nel suo catalogo nel 1931. Uno studio condotto nel 1970 ha rivelato che in realtà solo sei delle stelle di questo gruppo mostrerebbero un certo legame fisico, ossia farebbero parte di un ammasso aperto; le altre appaiono in quest'area solo per un effetto di prospettiva. In seguito, ulteriori studi a partire dal 1998 hanno chiarito che l'oggetto in realtà è un semplice asterismo, ossia che nessuna delle sue componenti sarebbe legata da interazioni gravitazionali; questi studi si sono basati sulla determinazione della parallasse e del moto proprio fornite dal satellite Hipparcos pubblicati nel 1997. (WikiPedia) ... Technical data: 5/7/2019, OMB Novezzina (VR), 1250 mt, t=17°c, sqm=20.60, Takahashi FSQ106 EDX IV @ f/3.0, Canon EOS 60D CentralDS @ 1600 ISO, Avalon Linear. Integration: light 57x150s, 5 dark, 32 bias, 32 flat. Total Integration: 2h 22m. PixInsight. Fully automated by Voyager.


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avatarsupporter
sent on July 06, 2019 (22:42) | This comment has been automatically translated (show/hide original)

Extraordinary the 106 to f3 stars and magnificent coloring :-)

avatarsupporter
sent on July 07, 2019 (9:25) | This comment has been automatically translated (show/hide original)

Actually, there are a few coffee pots in the corners, but I think it's more than tolerable :-D

avatarjunior
sent on July 07, 2019 (21:17) | This comment has been automatically translated (show/hide original)

Si Marzio a few little spherical aberrations if You had diaphragm to F4 you would have had more pointsformity.... but who cares is a great job. ;-)

avatarsupporter
sent on July 07, 2019 (22:21) | This comment has been automatically translated (show/hide original)

You two 8-) maniacs

avatarjunior
sent on July 07, 2019 (23:28) | This comment has been automatically translated (show/hide original)

:-D Macchi Ale!! maniacs us??? :-D

avatarsupporter
sent on July 08, 2019 (9:11) | This comment has been automatically translated (show/hide original)

anyway all those color moustaches I had using the FILTERS for the IL are gone :-)
... So...
:-D :-D :-D


April 03, 2020

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