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(IAAC) NGC 2022 -17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2022 (PK 196-10.1; PN G196.6-10.9; ARO 61)
Category: planetary nebula
Constellation: ORI
Object data: Vmag=12.4; Bmag=11.6; 28x28"; type IV+II; central star of
Vmag=14.9 (Bmag=13.0); discovered by Herschel in 1785; ELCAT: [OIII,
496+501nm] = 9 x [Hbeta, 486nm].
RA/DE: 05h42.10m, +0905.2' (2000.0)
Date and UT of observation: 26 December 1994, 01h00TU
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 5.6 with direct vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 145-624x
Filters used: OIII, UHC, prism

Description: at 145x, small to medium sized PN, oval shaped with quite
sharp edges, quite bright; estimated to be 46"x37" (on drawing) along a
NE-SW axis; OIII gives a good contrast gain and UHC a minor one; well seen,
even without filter [illustrating the relatively poor OIII/Hbeta ratio of
ELCAT data]; visible as a small fuzzy star at 45x without filter; suspected
darker center at 312x without filter, confirmed with UHC or OIII (easier);
no central star from 145x to 624x (even with prism); a mag11 star is 12' to
the W and a mag14 star is 40" to the NE.

I can provide a scanned drawing of NGC 2022 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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