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(IAAC) PK 024-05.1 (M 4-11) - 17.5" F/4.5
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: PK 024-05.1, M 4-11, PN G024.2-05.2, Sa 2-373, IRAS 18515-1009
Category: planetary nebula
Constellation: SER
Object data: Vmag=13.8, diam.21" (29"x26" in IDB), type II, central
star of Vmag=18.7, uranometria chart 295; discovered by Shapley;
ELCAT: OIII [496+501nm] = 9 x Hbeta [486nm].
RA/DE: 18h54m17s, -10°05'10" (2000.0)
Date and UT of observation: 20 August 2001, 23h10 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.34 (50% of the observing time
with averted vision)
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Altitude of object above horizon: 24°
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 400x
Filters used: UHC, OIII, Hbeta
Description: at 400x & OIII, medium sized PN, very faint, round and
homogeneous, ill-defined edges; about 27" in diameter; seen from 74
to 400x without filter; a mag.15 star stands upon the E edge; 2
mag.15 stars are just outside the SE edge; UHC and OIII filters give
good contrast gain and Hbeta is of no use; neither central star nor
color.
I can provide a scanned drawing of PK 024-05.1 (M 4-11) to anyone who
can read the binhex encoding of Eudora (for Mac); just mail me to try
(yann.pothier@fnac.net), it works quite often with other
configurations...
--
Carpe noctem, Yann.
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
yann.pothier@fnac.net
http://www.astrosurf.com/cielextreme
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