(IAAC) NGC 6842 - 8" F/10
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 6842 (PK 065+00.1; PN G065.9+00.5; ARO 106, He 2-451, Sh 2-95)
Category: planetary nebula
Object data: Vmag=13.1; Bmag=13.6; diam.=50" (67" in IDB); type IIIb;
central star of Vmag=15.98 (sp.06fp); discovered by Marth about 1850;
ELCAT: [OIII, 496+501nm] = 13 x [Hbeta, 486nm].
RA/DE: 19h55.01m, +29°17.0' (2000.0)
Date and UT of observation: 22 July 1993, 00h30UT
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): 6.3
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 2
Moon up (phase?): no
Instrument: Meade SCT 8"/203mm f/10
Filters used: UHC, OIII
Description: at 145x, located with OIII filter: superb PN; quite easy with
UHC too; very faint without filter; medium sized PN (diameter of about 50"
on drawing), intrinsically faint, homogeneous, with fuzzy edges and
surrounded by faint stars: mag14.5 star against the SE border, mag14 star
1'SE from the edge, mag12 star 1.5'N from center, mag10.5 star 4'NE and
mag9 star 11'ESE.
I can provide a scanned drawing of NGC 6842 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(email@example.com), it works quite often with other configurations...
11 impasse Canart, 75012 PARIS, FRANCE
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