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(IAAC) NGC 4361 - 17.5" F/4.5
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 4361 (PK 294+43.1; PN G294.1+43.6; ARO 26, VV 62)
Category: planetary nebula
Constellation: CRV
Object data: Vmag=109.9; Bmag=10.3; 81"x81"; type IIIa+II; central star of
Vmag=12.8; discovered by Herschel in 1785; ELCAT: [OIII, 496+501nm] = 4 x
[Hbeta, 486nm].
RA/DE: 12h24.50m, -18°47.6' (2000.0)
Date and UT of observation: 06 February 1997, 18h30UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.2
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 145-312x
Filters used: OIII
Description: at 125x & OIII, medium to large PN, faint, homogeneous with
very slight brightness increase towards the core, hard to tell if there is
internal details; diffuse borders and mag13 central star easy to see;
estimated diameter about 136".
I can provide a scanned drawing of NGC 4361 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...
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
yann.pothier@fnac.net
http://www.astrosurf.org/cielextreme
http://www.astrosurf.com/cielextreme
http://astrosurf.org/skylink/publi/cielextreme,
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