Parece que ya se ha observado en visual al ex-cometa ISON . Está entre magnitud 7 y 7.5.
http://groups.yahoo.com/neo/groups/comets-ml/conversations/topics/22923"Juan José González
Dear Piotr and all,
I can confirm your recent observation :
C/2012 S1 (ISON):
2013 Dec. 7.26 UT: m1=7.2, Dia.=10', DC=1/, 20 cm SCT (77x).
[ The comet's remnant visually shows a near-elliptical area with
a slightly higher degree of condensation and 10' of major axis,
with geometric center located approximately at R.A.=16h11m.8,
Decl.=-1o45'.0, about 20' separation in declination respect to
the pre-perihelion ephemeris position. Two faint tail-like estructures
are observable, the best defined one along 0.3-deg in p.a. 310 deg,
and the other one appears shorter and directed towards p.a. 180 deg.
Nearby field stars checked in DSS. Comparison stars at the same low
altitude ( 7º ) as the comet. Observation made from mountain location,
with very good seeing and transparency down to the horizon ].
( Cueto Rosales, alt. 1420 m., Leon, N. Spain ).
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ICQ Format:
2012S1 2013 12 07.26 S 7.2 TK 20.3T10 77 10 1/ ICQ
XX GON05
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Best regards,
J. J. Gonzalez"
La última imagen de los restos de Ison fue del 3 de Diciembre.
http://astronomia.udea.edu.co/cometspage/ISONDEC3.xhtml