Comet for Windows

Japanese version
Home page
Updated on June 16, 2007


o Overview

Comet for Windows is a software to analyze light curves of comets, or to support observation of comets.

You can display light curves of comets using observations in the world, calculate the magnitude formula based on those data, predict future brightness of comets, make a plan to observe comets, draw chart and look up magnitude of comparison stars, and so on.

o Download

The latest version is Version 1.5.0, released on June 16, 2007.


o Install

Please execute "cfw-1.5.0-e.exe" you downloaded, then Comet for Windows will be installed.

o If you failed to install

Please download "" here.

Please unzip "" you downloaded in the "C:\Program Files (x86)" folder, and execute "C:\Program Files (x86)\Comet.exe".

o Tutorial

Comet for Windows has sample data of Comet Hale-Bopp and Comet Hyakutake.

The following tutorial pages introduce the basic usage of Comet for Windows using the sample data.

o Light Curve Analysis of Comet Hale-Bopp

o Observation of Comet Hyakutake

o Play with New Data on the Internet

o Various Light Curves of Comets

o Comparing Light Curves

o Analysis of Comet Size

o Analysis of Comet Tails

o Statistics of Orbits

o Making of Annual Bulletin

o Light Curve Analysis of chi Cyg

o Frequently Asked Questions

o Note

Comet for Windows is recognized as an adware or spyware called Comet Cursor or CometSystems by Spybot-Search&Destroy or McAfee SiteAdvisor.

Comet for Windows is NOT an adware or spyware.

Spybot-Search&Destroy or McAfee SiteAdvisor judges it as an adware or spyware only based on the filename "Comet.exe".

I received a report that "Comet.exe" is recognized as Comet Cursor by Spybot-Search&Destroy when installing Comet for Windows into a default folder. In my own case, it is recognized as Comet Cursor when creating a short-cut to an executable file "Comet.exe" on the desktop.

When you fix the problem using Spybot-Search&Destroy, Comet for Windows will not run properly.

o Information about Comet Cursor

o Copyright/No Warranty

Copyright (C) 1995-2004 by Seiichi Yoshida ( All rights reserved.

Comet for Windows is a free software.

The use of this software is at your own risk. The copyright holder makes no warranty for anything. Any damage occurred as a result of this software is not the responsibility of the copyright holder.

The orbital elements of Comet Hale-Bopp and Comet Hyakutake enclosed in the Comet for Windows package are calculated by Kenji Muraoka.

Comet for Windows uses the zlib DLL (

Windows is a trademark of Microsoft Corporation. StellaNavigator is a registered trademark of AstroArts Inc. All other company and product names mentioned are the trademarks or registered trademarks of their respective companies in general.


Copyright(C) Seiichi Yoshida ( All rights reserved.