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NGC 3900 (Galaxy)
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Right ascension: 11h 50m
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Declination: 26° 56'
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Constellation: Leo
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Date/time: 2015.04.09 20:45 UT
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Equipment: 12" f/5 Newtonian
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FoV: 13'
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Magnification and filter(s): 250x
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Seeing: 7/10
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Transparency: 2/5
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SQM: 21.02 m/as2
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Temperature: 6°C
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Humidity: moderate
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Sight: 2 - minor details, somewhat interesting
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Difficulty: 4 - hardly visible, dark adaptation and very dark skies needed, averted vision is required to see details
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Position: 4 - hard, complex starhopping needed
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Location: Talpa Minor Observatory
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Observer: Ferenc Lovró
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Description:
A very faint galaxy, I see no star-like nucleus, however the central regions are somewhat brighter, and show many barely discernible brighter knots on the long axis of the galaxy. High humidity kills details.
This is my first real observation in self-made observatory (besides a quick check of Jupiter without proper collimation after I've transferred my light-bucket to the dome). Climate is excellent, plenty of space, the radio is on, very cozy place. What I've quickly discovered is that I must pay attention not to reach the side of the slit with the OTA's light path plus I've found that the SQM sees quite a lot in infrared despite the block filter in front of its detector. I have a strong infrared floodlight to support my security cameras that are watching the dome, and if I leave the infrared lights on, the SQM measures about 16 MPSAS instead of 21. Sorry for this interruption, now back to the observations. ;)
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Hi-resolution image: [ reversed sketch | original sketch ]
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ikonra kattintva magyarul is olvashatod az észlelést.
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