(IAAC) IC 4593 - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: IC 4593 (PK 025+40.1; PN G025.3+40.8; ARO 27)
Category: planetary nebula
Constellation: HER
Object data: Vmag=10.2; Bmag=10.9; 15"x11" [15.3"x14.7" in IDB]; type
II+IIa; central star of Vmag=11.3 (variable? NSV 7526 Bmag: 10.2-11.1);
discovered by Fleming in 1907; ELCAT: [OIII, 496+501nm] = 7 x [Hbeta,
RA/DE: 16h11m44s, +1204.5' (2000.0)
Date and UT of observation: 20 February 1994
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.31 with averted vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3 (stellar stars until 180x)
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Filters used: OIII, prism

Description: at 74x, slightly nebulous star, blue; located at 80x with
prism as a mag11 stellar dot superimposed on a faint continuous spectrum
(due to central star?); more nebulous at 125x and OIII filter (estimated
diameter of about 25"), more brighter in the center and well condensed.

Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE

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