Seiichi Yoshida's Home Page

Japanese version
Since December 4, 1995
Updated on October 22, 2025

MISAO Project

MISAO project aims to make much use of images taken all over the world for searching and tracking astronomical remarkable objects.

Software Engineering

  • pad2ps - automatic PAD Drawer


    • Photo by Yasukazu Ikari

    Minor Planet (32200) Seiicyoshida

    Minor Planet (32200) 2000 OT2, discovered by Yasukazu Ikari on July 28, 2000, is named as Seiicyoshida. It is observable at 16.5-20 mag.

    Citation for (32200) Seiicyoshida


    The "Tahdet ja avaruus -magazine" (Stars and Space, Finland) kindly made an interview and pubslished an article to introduce me in 2017 February.

    The photo is taken by 'Hoshinavi / AstroArts'.

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    Astronomical Information

  • Comet Information

  • Comet Catalog (Oct. 22, 2025) [What's New]

    • Astronomical Pictures

  • Latest Pictures of Comets (Oct. 21, 2025)

  • Pictures of Rendezvous (Oct. 2, 2025)

  • Pictures of C/2024 G3 ( ATLAS ) (Aug. 30, 2025)
  • Pictures of C/2023 A3 ( Tsuchinshan-ATLAS ) (Oct. 1, 2025)
  • Pictures of C/2023 P1 ( Nishimura ) (Feb. 27, 2024)
  • Pictures of C/2021 A1 ( Leonard ) (June 26, 2022)
  • Pictures of C/2020 F3 ( NEOWISE ) (Aug. 10, 2024)
  • Pictures of C/2012 S1 ( ISON ) (Aug. 10, 2024)
  • Pictures of C/2011 L4 ( PanSTARRS ) (July 9, 2016)
  • Pictures of C/2011 W3 ( Lovejoy ) (Feb. 15, 2012)
  • Pictures of 17P/Holmes (Feb. 27, 2017)
  • Pictures of C/2006 P1 ( McNaught ) (Oct. 3, 2007)
  • Pictures of C/2004 Q2 ( Machholz ) (July 26, 2025)
  • Pictures of C/2002 V1 ( NEAT ) (Mar. 2, 2003)
  • Pictures of C/1998 J1 ( SOHO ) (Jan. 1, 2005)
  • Pictures of C/1995 O1 ( Hale-Bopp ) (July 22, 1997)
  • Pictures of C/1996 B2 ( Hyakutake ) (Feb. 10, 2013)

    • Observations Data

  • Seiichi Yoshida's Diary of Comet Observations (Sept. 27, 2025)

  • Magnitude Data of Comets (Sept. 27, 2025)
  • Magnitude Data of Novae and Supernovae (May 7, 2018)
  • Magnitude Data of Variable Stars (Nov. 4, 2019)
  • Meteor Shower Observations (Nov. 21, 2001)

  • CCD Magnitude Data of Comets (Mar. 5, 2000)
  • CCD Magnitude Data of Novae and Supernovae (Apr. 5, 2000)

  • Ranking of Brightest Comets I Observed
    1st -5.2 mag 2007 Jan. C/2006 P1 ( McNaught )
    2nd -1.5 mag 2025 Jan. C/2024 G3 ( ATLAS )
    3rd -0.4 mag 1997 Mar. C/1995 O1 ( Hale-Bopp )
    4th 0.0 mag 1996 Mar. C/1996 B2 ( Hyakutake )
    5th 0.5 mag 2024 Oct. C/2023 A3 ( Tsuchinshan-ATLAS )
    6th 2.1 mag 2007 Nov. 17P/Holmes
    7th 3.2 mag 2005 Jan. C/2004 Q2 ( Machholz )
    8th 3.3 mag 2002 Apr. 153P/2002 C1 ( Ikeya-Zhang )

    3.3 mag 2020 July C/2020 F3 ( NEOWISE )
    10th 3.4 mag 2004 May C/2001 Q4 ( NEAT )

    3.4 mag 2018 Dec. 46P/Wirtanen
    12th 3.8 mag 2015 Jan. C/2014 Q2 ( Lovejoy )
    13th 4.4 mag 2001 July C/2001 A2 ( LINEAR )
    14th 4.8 mag 2024 Mar. 12P/Pons-Brooks
    15th 4.9 mag 2013 Nov. C/2013 R1 ( Lovejoy )

  • Ranking of Brightest Periodic Comets I Observed
    1st 2.1 mag 2007 Nov. 17P/Holmes
    2nd 3.3 mag 2002 Apr. 153P/Ikeya-Zhang
    3rd 3.4 mag 2018 Dec. 46P/Wirtanen
    4th 4.8 mag 2024 Mar. 12P/Pons-Brooks
    5th 5.3 mag 2008 Jan. 8P/Tuttle
    6th 5.6 mag 2010 Nov. 103P/Hartley 2
    7th 5.9 mag 2006 May 73P/Schwassmann-Wachmann 3
    8th 6.3 mag 2016 Apr. 252P/LINEAR
    9th 6.8 mag 2018 Sept. 21P/Giacobini-Zinner
    10th 6.9 mag 2017 Feb. 45P/Honda-Mrkos-Pajdusakova
    11th 7.3 mag 2017 Mar. 41P/Tuttle-Giacobini-Kresak
    12th 7.5 mag 2013 Nov. 2P/Encke
    13th 7.7 mag 1998 Jan. 55P/Tempel-Tuttle
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    Astronomical Softwares

  • Automated Astronomical Image Examination System
    PIXY System 2 (May 9, 2004)

  • Comet for Windows (June 16, 2007)

  • Tool to Search loneos.phot (June 11, 2003)

  • Neural Network Scheduler for Comets Observation (July 21, 2004)
  • Neural Network Scheduler for Messier Observation (Jan. 22, 1998)

  • Filters for Windows (June 6, 1998)

    • Resources and Documents

  • Magnitude System and Color Conversion Formulas (Jan. 1, 2010)

    • Researches and Reports

    * Comet Researches *

  • Discovery of a Periodic Comet, and its Naming (Aug. 8, 2024)
  • Unexplainable Fading of Nuclear Magnitude of Comet C/2001 OG108 (Dec. 12, 2005)
  • Three new possible Taurid complex members (Nov. 28, 2005)
  • NASA Deep Impact: Amateur Observers: Intermediate Guide
    But what is the magnitude of Tempel 1?     (Aug. 9, 2005)
  • Ground-Based Observations of Nuclear Surface of Comet 2P/Encke (July 21, 2005)
  • Unusual Comet C/2003 T4 ( LINEAR ) (June 21, 2005)
  • Dust Trail of a Dead Comet Phaethon (June 12, 2005)
  • Straight Tail of Comet 162P/2004 TU12 (Nov. 18, 2004)

    • * Catalog Researches *

  • Statistics of Galaxies by Magnitude and Catalog (May 12, 2003)
  • Verification of Comets Detection from 2MASS Images (May 3, 2003)

    • * Columns *

  • Unusual Stars in Landolt Standard Stars (May 11, 2003)

    • Presentations and Publications

  • 36th Comet Conference (March 18 and 19, 2006)
    Light Curves of Comets in 2005 (July 12, 2006)
  • 35th Comet Conference (March 19 and 20, 2005)
    Light Curves of Comets in 2004 (July 19, 2005)
  • 34th Comet Conference (March 6 and 7, 2004)
    Light Curves of Comets in 2003 (Aug. 31, 2004)

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    Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.

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