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\IBVShead{5315}{9 September 2002}

\IBVStitletl{Multicolor Observations}{ of V838 M\lowercase{on}}

\IBVSauth{Price, A.$^1$; Mattei, J.$^1$; Henden, A.$^2$; West, D.$^3$; Bedient, J.$^4$; Nelson, P.$^1$; Smelcer, L.$^1$; Klinglesmith, D.$^1$; Luedeke, K.$^1$; Sherrod, C.$^1$; O'Connor, S.$^1$; Oksanen, A.$^1$; Templeton, M.$^1$}

\IBVSinst{AAVSO, Clinton B. Ford Astronomical Data and Research Center. 25 Birch St., Cambridge, MA. \\ e-mail: aavso@aavso.org}

\IBVSinst{Universities Space Research Association/U.S. Naval Observatory, P.O. Box 1149, Flagstaff, Arizona 86002-1149,
USA, e-mail: aah@nofs.navy.mil}

\IBVSinst{P.O. Box 517, Derby, KS 67037, USA, e-mail: dwest61506@aol.com}

\IBVSinst{1464 Molehu Dr., Honolulu, Hawaii 96818-1917 USA, e-mail: bedient@hawaii.rr.com}

\SIMBADobj{V838 Mon}

\IBVSabs{We present multicolor CCD and PEP photometry}
\IBVSabs{and visual observations of V838 Mon for the first 135 days of the}
\IBVSabs{2002 outburst.}


\begintext

\IBVSTnam{V838 Mon (GSC 04822-00039, USNO-A2.0 0825-03833116)}

\IBVSTcoo{07\hr04\mm04\sec801 }{$-$03\deg50\arcm50\farcs77 $\pm$0\farcs3 \hspace*{0.05cm}(Kiyota 2002)}{2000}

\IBVSTdet{Various AAVSO observer instruments. Details available upon request.}

\IBVSTfil{CCD: $V$, $B$, $I_C$, $R_C$; PEP: $V$, $B$; Visual}

\IBVSTdateobs{2001.12.22 $-$ 2002.05.03}

\IBVSTcomp{Finder chart and comparison stars are available at {\tt http://charts.aavso.org/}.\ Comparison stars were based on the Tycho-2 catalog (comparison $V<10\fmm5$) and field photometry by Henden  (comparison $V>10\fmm6$).}

\IBVSTdata{Available by e-mailing {\tt aavso@aavso.org}.}

\IBVSTtyp{ Novae }

\IBVSTrem{The AAVSO has collected 2640 visual, 480 CCD, and 18 PEP observations of V838 Mon over a 135 day period following its discovery on Jan 6.6 (Brown 2002). R band observations plotted prior to the discovery were obtained using the Stardial CCD image archive (McCullough 1997). Figure 1 is CCD + PEP data. Error depends on the observer and is available upon request but typically can be estimated to be $\pm$ 0\fmm1. Figure 2 shows visual data.}

\IBVSTack{The visual observations come courtesy of 195 observers in 29 countries. The complete list of observers is available via the AAVSO Online Light Curve Generator at {\tt http://www.aavso.org/adata/curvegenerator.shtml}. We would also like to thank the following observers for providing supplemental CCD coverage: Rubright, G.; Arnold, J.; Phelps, M.; Mattei, M.; Van Werven, A.; Tikkanen, P.; Gandet, T.; and Hodgson, W.}

\vspace*{2cm}

\IBVSfig{11cm}{5315-f1.eps}{CCD \& PEP Data}
%\IBVSfigKey{5315-f1.eps}{V838 Mon}{light curve}

\newpage

\IBVSfig{9.7cm}{5315-f2.eps}{Visual Data}
%\IBVSfigKey{5315-f2.eps}{V838 Mon}{light curve}

\references

Kiyota, S., 2002, {\it IAUC}, {\bf 7786}

Brown, N. J., 2002, {\it IAUC}, {\bf 7785}

McCullough, P., Thakkar, U., 1997, {\it Publ. Astron. Soc. Pac.}, {\bf 109}, 1264

\endreferences


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