[vsnet-obs 41570] (fwd) V838 Mon Getting Brighter in Ic Band

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From: DWest61506@aol.com
Date: Thu, 26 Sep 2002 07:04:09 EDT
Subject: V838 Mon Getting Brighter in Ic Band

In IAUC 7976 A. M. Watson and R. Costero report "The star has brightened in 
the range 8.7-11.9
microns by about 3 mag since January (cf. IAUC 7831)."  My Ic band photometry 
also indicates (see below) that V838 Mon is
getting brighter in the near IR.  A simple linear fit to the observations 
indicates the brightening is occurring at a rate of 0.008 mag/day.

Regards,
Doug West
http://hometown.aol.com/dwest61506/index.html 

V838 Mon Observation Details:
Color transformed Ic band CCD photometry
Photometric aperture radius 6.84"
Equipment: 0.2 m SCT + ST-9E CCD + Ic filter
comparison star GSC 4822:3661, Ic=9.664 per A. Henden
V-Ic=5 used for V838 Mon in color transformations
2002 Sep 3.443 UT, Ic = 10.70 +/- 0.03 
2002 Sep 9.433 UT, Ic = 10.68 +/- 0.03 
2002 Sep 18.441 UT, Ic = 10.63 +/- 0.03 
2002 Sep 24.441 UT, Ic = 10.53 +/- 0.03

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