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(IAAC) IC 418 - 17.5" F/4.5
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: IC 418 (PK 215-24.1; PN G215.2-24.2; ARO 3)
Category: planetary nebula
Constellation: LEP
Object data: Vmag=9.32; Bmag=10.7; 14"x11"; type IV; central star of
Vmag=10.17; discovered by Fleming in 1891; ELCAT: [OIII, 496+501nm] = 1 x
[Hbeta, 486nm] !!!.
RA/DE: 05h27.5m, -12°42' (2000)
Date and UT of observation: 23 December 1997, 23h30 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.4 with averted vision (20% of the time)
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3.5 (stellar stars until 125x)
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 400x
Filters used: UHC, OIII, Hbeta
Description: at 400x and OIII, small PN, bright and round with quite sharp
edges, homogeneous; estimated diameter of about 19"; the OIII filter makes
the nebula bigger; UHC has a good contrast gain, OIII a very good one and
Hbeta (for once) has a good one too [thanks to the tremendeous Hbeta flux
of this PN].
I can provide a scanned drawing of IC 418 to anyone who can read the binhex
encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works quite often with other
configurations...
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
ypothier@abi.snv.jussieu.fr
ypothier@closun.snv.jussieu.fr
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,
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