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(IAAC) Sh2-84 - 17.5" F/4.5



Observer: Yann POTHIER (France)
Your skill: advanced (many years)
Object: Sh2-84 (vdB 127, LBN 131, GN 19.46.8)
Category: nebula
Constellation: SGE
Object data: phot.bright.=3/5; 6'x3' in ©Uranometria, diam.15' in
©Guide8; emission type nebula.
RA/DE: 19h49.0m, +18°24' (2000.0)
Date and UT of observation: 02 August 2003, 00h35 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): 2
Altitude of object above horizon: 55°
Moon up (phase?): no
Instrument: Coulter 445mm/17.5" F/4.5
Magnification: 74x, 125x
Filters used: UHC, OIII, Hbeta
Description: at 74x with OIII filter, and 125x with UHC filter, large
nebula, extremely faint (seen 25% of the observing time), round with
nebulous edges; about 3' in diameter (coordinates of the glow seen:
19h49m00s, +18°24'09"); two brighter zones are visible on the E and W
sides; the eastern one is the faintest, is located between 2 mag.15
stars (NNW-SSE), and is about 1.5'x0.9' along a NNE-SSW axis; the
western brighter zone is more obvious, has a mag.13 on its W edge and
is about 2.1'x1.5' along a NNE-SSW axis; with the above mentioned
stars, a mag.12 star is on the NNE internal edge of the nebula; the
global nebular glow is located between 2 mag.8 stars 3.7' to the SW
and 6.1' to the NE (from center); UHC provides a slight contrast
gain, OIII a good one and Hbeta is of no use; the nebula is invisible
without filter.
I can provide a scanned drawing of Sh2-84 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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