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(IAAC)Object:- Helix nebula NGC7293 20" Dob-Newt



Observer:N.J.Martin
Your skill:intermediate
Date and UT of observation:03/04 September 1997 02.00
Location & latitude:near Ayr South West Scotland lat 55 24'56"
Site classification:bright rural
Limiting magnitude (visual):6 (zenith) 4 at altitude 11 degree of nebula
Seeing (1 to 5 - best to worst):2
Moon up (phase?):no
Instrument:20" f4.4 Dobsonian
Magnification:X86
Filters used:Lumicon UHC
Object:NGC 7293  Helix Nebula
Category:Planetary nebula
Constellation:Aquarius
Object data:mag 6.5 15'X12' 
RA/DE:22hr 27' -21 06'
Description: The magnitude is a con trick. The object is half the diameter
of the moon and so has a very low surface brightness. Only just visible in
binoculars as a featureless disc and looks similar in telescope without the
UHC filter. With filter is clearly a planetary nebula with darker centre and
broad perimeter ring. The ring is clearly double in the north west and south
east quadrants with some evidence of doubling in other parts. The low
altitude at my latitude does not help visibility.
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|   nmartin@bonnyton.u-net.com    |
|"There are more things in heaven and earth ... than are dreamt of in your
philosophy"   (Hamlet, Act 1, Sc. 5)  |
Bonnyton House, Ayrshire,Scotland, UK. lat 55 24'56" N long 4 26' 00" W
Altitude 150 m.
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