(IAAC) Abell 10 (PK 197-14.1; PN G197.2-14.2) - 17.5" F/4.5

Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Date and UT of observation: 29 December 1994, about 22h00 UT
Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36)
Site classification: rural, alt.1650m (5500ft)
Limiting magnitude (visual in UMi): 6.0
Transparency (1 to 5 - best to worst): 2
Seeing (1 to 5 - best to worst): 3
Moon up (phase?): no
Instrument: Coulter 17.5" (445mm) F/4.5
Magnification: 145x
=46ilters used: OIII, UHC
Object: Abell 10 (PK 197-14.1; PN G197.2-14.2; PK 197-14 1; K 1-7; ARO 176)
Category: planetary nebula
Constellation: ORI
Object data: Vmag=3D14.7; Bmag=3D15.2; dim.35"x35" (40" in IDB); type III;
central star of Vmag=3D19.6; discovered by Abell in 1955 and Kohoutek in 196=
RA/DE: 05h31.8m, +06=B056' (2000); Uranometria 180
Description: at 145x and OIII, medium sized PN, quite "bright" (compared to
common Abell PNs), round and homogeneous with quite sharp edges; estimated
diameter about 27" (on drawing); OIII filter has a very good contrast gain
and UHC has a good one; invisible at 45x without filter, visible at 74x and
even at 45 with OIII when already located at higher power; well seen after
87x, even without filter; a mag13 star is 30" to the SE.
I can provide a scanned drawing of Abell 10 to anyone who can read the
binhex encoding of Eudora (for Mac); just mail me to try
(ypothier@abi.snv.jussieu.fr), it works sometimes with other
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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