AAVSO Special Notice #48: Update on V5558 Sgr

V5558 Sgr, a nova that went into outburst in April
(see Special Notices 44 and 45), continues to
increase in brightness.  The last reports indicate
that this nova has reached V=8.6, brightening by
about 0.02mag per day.  We have produced a new
sequence, based on recent calibration from Sonoita
Research Observatory along with nearby Tycho2 and
GCPD stars.  You can download this sequence as part
of the VSP chart:
http://www.aavso.org/observing/charts/vsp
(and select V5558 Sgr as the target).  This is
highly unusual behavior for a nova, and you should
make this object part of your observing routine
until further notice.

Coordinates (from SRO, using UCAC2):
18:10:18.26 -18:46:51.9 (J2000)

Since there is a 12th magnitude companion just to the
northwest of the variable, use a large enough aperture
to include both stars and place a comment to this effect
in the comments field.

Report observations to the AAVSO as 1804-18 V5558 SGR.

Arne Henden

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