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(IAAC) NGC 2242 -17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 2242 (PK 170+15.1; PN G170.3+15.89; Iras 06304+4448)
Category: planetary nebula
Constellation: AUR
Object data: Vmag=15.0; 22x22"; type ?; central star of Vmag=15.2;
discovered by Swift in 1887 (and as a PN by Shaw in 1987...); ELCAT: [OIII,
496+501nm] = 2.5 x [Hbeta, 486nm].
RA/DE: 06h34.10m, +4446.8' (2000.0)
Date and UT of observation: 28 December 1997, 21h20TU
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: 125x
Filters used: OIII, UHC, Hbeta

Description: at 125x and OIII (the best combination on my scope to see this
ellusive object), small to medium sized PN, extremely faint, round and
homogeneous (or very slightly brighter center), well defined adges;
estimated (on drawing) to be about 21" in diam.; curiously, both UHC and
OIII are quite innefective on this PN [as illustrated by the very poor
OIII/Hbeta ratio of ELCAT] and Hbeta is of no use.

I can provide a scanned drawing of NGC 2242 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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