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(IAAC) NGC 6445 - 4.25" F/7.8



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 6445 (PK 008+03.1; PN G008.0+03.9; ARO 67, He2-290, Sa2-248, VV118)
Category: planetary nebula
Constellation: SGR
Object data: Vmag=11.2; Bmag=13.2; 38"x29"; type III+IIIb; central star of
Vmag=19:; discovered (as a PN) by Pickering in 1827; ELCAT: [OIII,
496+501nm] = 20 x [Hbeta, 486nm].
RA/DE: 17h49.25m, -2000.6' (2000.0)
Date and UT of observation: 17 July 1990, evening
Location & latitude: Bucher Mountain (France, latN44 40:, longE06 28:)
Site classification: rural, alt.2350m (7100ft)
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, well visible, small and shapeless with a mag7 star
5'W; at 72x, this star is a double (mag10-11 companion), the nebulosity is
still diffuse and irregular; at 100 and 150x, its oval shape is better
seen, homogeneous.


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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