Humason 1-1 (Planetary nebula)
|
Also known as: Hu 1-1
|
Right ascension: 29h 09m
|
Declination: 56° 03'
|
Constellation: Cassiopeia
|
Date/time: 2015.12.01 19:45 UT
|
Equipment: 12" f/5 Newtonian
|
FoV: 10'
|
Magnification and filter(s): 375x
|
Seeing: 7/10
|
Transparency: 4/5
|
SQM: 21.12 m/as2
|
Temperature: 6°C
|
Humidity: low
|
Wind: breeze
|
Sight: 1 - nothing spectacular
|
Difficulty: 5 - almost invisible, total dark adaptation, very dark skies and averted vision is a must to see the object
|
Position: 3 - moderate, some starhopping needed
|
Location: Talpa Minor Observatory
|
Observer: Ferenc Lovró
|
Description:
Bright but very tiny, therefore really difficult object: even at 250x it looks completely stellar. I looked for about 45 minutes at a wrong place nearby thanks to some really inaccurate sketches I used to find this planetary nebula. Turns out, some fellow sketchers did not really see this object, yet confidently drawn a similar fuzzy in a field that is nearby, even resembles the real field a bit, but they were wrong. So I've just learned that it's not only astrophotographs a visual observer shouldn't trust, but one must be precautious with sketches too. Higher magnification may be better, but I couldn't go any higher because of my rather poor condition Dobsonian mount. I've tried O-III, UHC-S and UHC filters, but neither enhanced the view worth mentioning.
|
Hi-resolution image: [ reversed sketch | original sketch ]
|