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(IAAC) NGC 6818 - 4.25" F/7.8



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 6818 (PK 025-17.1; PN G025.8-17.9; ARO 12)
Category: planetary nebula
Constellation: SGR
Object data: Vmag=9.3; Bmag=9.9; >17" (22"x15"); type IV; central star of
?mag=13.1?(sp.WR); discovered by W. Herschel in 1787; ELCAT: [OIII,
496+501nm] = 23 x [Hbeta, 486nm].
RA/DE: 19h44.0m, -1409.' (2000.0)
Date and UT of observation: 24 June 1990, evening
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.0
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): ?
Moon up (phase?): no
Instrument: Japanese Newtonian 4.25"/114mm  f/7.8
Magnification: 36-180x
Filters used: -

Description: at 36x, hard to locate because of its small size; fuzzy star
looking bluish; at 72x, nice nebula, small size (confirmed at this power);
at 100x, shapeless; at 150x, somewhat elongated but hard to tell its
orientation; still bluish.


Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
yann.pothier@fnac.net
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,


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