[Prev][Next][Index][Thread][Search][Objects]
(IAAC) IC 1454 - 17.5" F/4.5
Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: IC 1454 (PK 117+18.1; PN G117.5+18.9; Abell 67)
Category: planetary nebula
Constellation: CEP
Object data: Vmag=13.8; Bmag=14.8; 34"x34" (28.5"x28.5" for IDB); type IV;
central star of Vmag=16.4; discovered by Denning between 1888 and 1894 (as
a PN by Abell in 1955); ELCAT: [OIII, 496+501nm] = 14 x [Hbeta, 486nm].
RA/DE: 22h42.80m, +80°27.4' (2000)
Date and UT of observation: 23 August 1998, about 03h20 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.31 with averted vision
Transparency (1 to 5 - best to worst): 1
Seeing (1 to 5 - best to worst): 4
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 211-400x
Filters used: UHC, OIII, Hbeta
Description: at 211x, medium sized PN, medium brightness, round without
central star, quite sharp edges; seen from 74x to 400x without filter;
portions of ring are seen at 400x and OIII filter; UHC provides a small
contrast gain, OIII a good one and Hbeta none; 2 mag15 stars are on the NE
edge; estimated diameter of about 40"; a yellow mag7 star is 4' to the E.
I can provide a scanned drawing of IC 1454 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works quite often 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,
To UNSUBSCRIBE from the 'netastrocatalog' lists, use the Web form at:
http://www.visualdeepsky.org/subscribe.html