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(IAAC) NGC 40 - 4.25" F/7.8



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 40 (PK 120+09.1; PN G120.0+09.8; ARO 1)
Category: planetary nebula
Constellation: CEP
Object data: Vmag=12.3; Bmag=10.7; 60"x38"; type IIIb+III; central star of
Vmag=11.61 (HD 826); discovered by W. Herschel; ELCAT: [OIII, 496+501nm] =
0.3 x [Hbeta, 486nm].
RA/DE: 00h13.01m, +7231.3' (2000.0)
Date and UT of observation: 26 June 1990
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): -
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Japanese 4.25" (114mm) F/7.8
Magnification: 36-180x
Filters used: -

Description: at 36x central star of mag11-12, surrounded by a small and
faint nebulosity; at 72x, it was located at this power, nice, apparent
central star; at 150x, mag12 star 1' from the PN.

Note: the sub-zero OIII/Hbeta ratio rarely found in PNs, typical of low
excitation PNs.


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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