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(IAAC) Hb 5 (PK 359-00.1; PK 359-0.1; PN G359.3-00.9) - 24.4" F/15



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 27 July 1992, evening about 22:00 local time
Location & latitude: Chateau-Renard Obs. (France, latN44 39, longE06 27 36)
Site classification: moutain top, alt.2990m (9000ft)
Limiting magnitude (visual in UMi): 6.5 with averted vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 5
Moon up (phase?): no
Instrument: Cassegrain 24.4" (620mm) F/15
Magnification: 390-650x
Filters used: none
Object: Hb 5 (PK 359-00.1; PK 359-0.1; PN G359.3-00.9; He 2-286; ARO 389;
HD 316340)
Category: planetary nebula
Constellation: SGR
Object data: Vmag=11.8; Bmag=13.6; dim.>13"; type II+VI PN; central star of
Vmag=???; discovered by Hubble in 1921.
RA/DE: 17h47.9m, -3000' (2000);

Description: at 390x, faint fuzzy patch placed very near a mag12 star (at
about 15"SW PA225); the two are quite similar in brightness; at 650x,
perfectly round (about 10" in diameter) and homogeneous.

Note: on professionnal ccd shots, Hb 5 shows dramatic details, looking like
the Southern Crab nebula of the bug nebula (NGC 6302); with better seeing
conditions and maybe from a more southern latitude, it should show its
details to fine optics.

I can provide a scanned drawing of Hb 5 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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