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(IAAC) NGC 6826 - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 6826 (PK 083+12.1; PN G083.5+12.7; ARO 13)
Category: planetary nebula
Constellation: CYG
Object data: Vmag=8.8; Bmag=9.8; diam.>25" (27"x24"); type IIIa+II; central
star of Vmag=10.6 (sp.06fp); discovered by W. Herschel in 1793; ELCAT:
[OIII, 496+501nm] = 10 x [Hbeta, 486nm].
RA/DE: 19h44.85m, +5031.3' (2000.0)
Date and UT of observation: 04 August 1997, 00h05TU
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual with averted vision in UMi): 6.31 (30% of the time)
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2.5 (pinpoint stars until 148x)
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 72-400x
Filters used: UHC, OIII, Hbeta

Description: at 400x and with OIII filter, medium sized PN, bright,
oval-shaped about 45"x41" (on drawing) along an E-W axis; sharp edges,
quite homogeneous; UHC gives a good contrast gain, OIII a very good one and
Hbeta giving no enhancement but only the central parts of the nebula are
still detectable (more Hbeta emissions near the center?); bluish color
visible at high power; bright central star of mag11.

I can provide a scanned drawing of NGC 6826 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(yann.pothier@fnac.net), it works quite often with other configurations...


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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