The world is my country, and science is my religion.
/ Christian Huygens /



In memoriam Halton C. Arp (1927-2013).


My astronomy sketches. Hover mouse over image for the inverted look. For fainter objects, take a look at the black-on-white original, sometimes it reveals more details.


Need advice? Want to discuss an observation? Feel free to contact me at flovro gmail*com.

ÚJ! Amennyiben elérhető, a ikonra kattintva magyarul is olvashatod az észlelést.


Show me the newest sketches!
By type: open clusters [67] globular clusters [14] diffuse nebulae [3] dark nebulae [0] planetary nebulae [27] variable stars [18] binary stars [23] asterisms [2] galaxies [119] quasars [1] planets [2] minor planets [1] comets [5] Sun [0] Moon [5] other objects [8]
By catalogue: Messier 1-50 [20] Messier 51-110 [18] NGC 1-1000 [17] NGC 1001-2000 [21] NGC 2001-3000 [32] NGC 3001-4000 [25] NGC 4001-5000 [18] NGC 5001-6000 [22] NGC 6001-7000 [40] NGC 7001-7840 [35] IC 1-5386 [1] other catalogues [71] uncataloged [10] [25]
By constellation:



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 ]
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All text and images are ©opyright of Ferenc Lovró. All rights reserved worldwide.

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