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(IAAC) He 1-4 (PK 68+1 2; PN G068.6+01.1) - 17.5" F/5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 29 July 1997, about 00h15 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.4
Seeing (1 to 5 - best to worst): 2 (pinpointed stars until 145x)
Moon up (phase?): no
Instrument: Coulter 44.5-cm/17.5-inch F/4.5
Magnification: 211x
=46ilters used: UHC, OIII, Hbeta
Object: He 1-4 (PK 68+1 2; PN G068.6+01.1)
Category: Planetary Nebula
Constellation: CYG
Object data: Vmag=3D14.5; dim.22"x22"; type IIIb; central * Vmag=3D21.07;
discovered by Henize in 1961
RA/DE: 19h59.30m, +31=B054.5' (2000); Uranometria 119
Description: at 211x et OIII, small and round PN, extremely faint without
filter and very faint with one; visible without filter since 211x and with
filter since 125x; UHC has a slight contrast gain, OIII a good one and
Hbeta has no gain at all; brighter center; estimated diameter of about 30";
mag11 star embedded in the E border; mag7 star at 7'SE.
I can provide a scanned drawing of He 1-4 to anyone who can read the binhex
encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works sometimes with other
configurations...
Yann Pothier	tel: 01 43 41 43 29
11 impasse Canart, 75012 PARIS, FRANCE
Email: ypothier@abi.snv.jussieu.fr
Site : http://pegase.unice.fr/~skylink/publi/cielextreme
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