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(IAAC) Obj: M88, SN1999cl - Inst: 17.5" f/4.5 Dobsonian



Observer: Lew Gramer
Your skills: Intermediate (some years)
Date/time of observation: 04/05 June 1999  0300 UT
Location of site: Myles Standish State Forest, MA, USA (Lat 42N, Elev 5m)
Site classification: Rural
Sky darkness: 6.4 <Limiting magnitude>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 17.5" f/4.5 Dobsonian
Magnification: 125x, 220x, 285x
Filter(s): None
Object(s): M88, SN1999cl
Object category: Galaxy. Supernova.
Object class: SA(rs)bc I, SN type Ia
Constellation: Com
Object data: mag 9.63, 14.2  size 6.92x3.72
Position: 123159.6+142512
Description:
Dave Mitsky wrote:
>I observed SN 1999cl... and it was considerably brighter than I
>expected it to be. Does anyone have a current magnitude estimate?
--
Dave, we saw the SN Friday night (4Jun) from Myles Standish State Forest
in S MA. The site is pretty dark, but it was a hazy night, best estimate
of telescope LM in that area of the was about 14.5 at 180x in my friend
Steve Clougherty's 17.5" f/4.5 dob. Using fine directions I'd remembered
from the list here I found the mag 12 star near M88's core, noted a pair
of mag 13.5(?) stars just off the core, and used all three as guides to
the location of the SN - and there it was, twinkling just on the edge of
averted vision. :) My mag estimate (with few stars nearby for comparison)
was 14.2. As it turns out, there were several other observations on the
VSNET and the ISN chat from 0603 and 0604 that are in that same range...
As for M88, it had the usual lovely bright core, with a nicely elongated
6'x2' halo. However, no real detail was logged... I guess I was too busy
gawking at that averted-vision sparkle of a stellar explosion! :)
Clear skies,  Lew
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