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(IAAC) J 320 (PK 190-17.1; PN G190.3-17.7) - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 29 December 1994, about 21h00 UT
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 indirect vision
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 312x
=46ilters used: OIII, UHC, visual spectroscope
Object: J 320 (PK 190-17.1; PN G190.3-17.7; Jonckeere 320, ARO 60)
Category: planetary nebula
Constellation: ORI
Object data: Vmag=3D11.9; dim.11"x8"; type VI ; central star of Vmag=3D14.31=
;
discovered by Jonckeere in 1916; ELCAT: [OIII, 496+501nm] =3D 16 x [Hbeta,
486nm].
RA/DE: 05h05.6m, +10=B042' (2000); Uranometria 179
Description: found at 80x with spectroscope as a "star" of mag11.5; at
125x, somewhat nebulous; at 312x without filter, small nebulous patch with
a brighter center, estimated to be about 13" in diameter (on drawing) but
may look very slightly elongated E-W; UHC has a good contrast gain and OIII
a very good one; a mag 10.5 star is 5' to the SSE.
I can provide a scanned drawing of J 320 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
11 impasse Canart, 75012 PARIS, FRANCE
ypothier@abi.snv.jussieu.fr
ypothier@closun.snv.jussieu.fr
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,
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