(IAAC) NGC 1501 - 8" F/10

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: NGC 1501 (PK 144+06.1; PN G144.5+06.5; ARO 44)
Category: planetary nebula
Constellation: CAM
Object data: Vmag=11.9; Bmag=12.5; 56x48" [64x60" in IDB]; type IIIa;
central star of Vmag=13.4; discovered by Herschel in 1787; ELCAT: [OIII,
496+501nm] = 17 x [Hbeta, 486nm].
RA/DE: 04h07.00m, +6055.' (2000.0)
Date and UT of observation: 25 December 1992, 20h00UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 5.6
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Meade SCT 8" (203mm), F/10
Magnification: 45-312x
Filters used: UHC, OIII
Description: at 45x, easy, small nebulous patch; at 145x, medium sized PN,
medium brightness, homogeneous and round; the edges are better defined with
UHC and the object seems to be slightly darker in center; very good
contrast gain with OIII and the annularity is more evident as with 312x;
estimated diameter of about 50".
I can provide a scanned drawing of NGC 1501 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
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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