Welcome to the Communications in Mars Observations
CMO Since 1986

Issued by
the International Society of the Mars Observers
Last updated on
30 November 2023
at 08:30 GMT

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This web-site will provide up-to-date commentaries about
the world-wide observations of the planet Mars
in association with the recent issue of the
Communications in Mars Observations
(abbreviated to CMO) published by the
International Society of the Mars Observers
(abbreviated to ISMO)

The ISMO Advisory Board consists of
Donald PARKER (DPk), Christophe PELLIER (CPl), William SHEEHAN (WSh)
Tadashi ASADA (As), Reiichi KONNAÏ (Kn), and Masatsugu MINAMI (Mn)

On the other hand, the CMO/ISMO Editorial Board consists of
Tadashi ASADA (As), Masatsugu MINAMI (Mn),
Masami MURAKAMI (Mk; cmo@mars.dti.ne.jp), Takashi NAKAJIMA (Nj),
and Akinori NISHITA (Ns)

2023 CMO News

 D. Mars was in Conjunction

  Mars was in conjunction with the Sun in the constellation Libra on November 18th and moved to the west of the Sun. As shown in the SOHO image featured in this conjunction, Mars passed directly behind the Sun.

  It will not be until the end of January 2024 that the elongation from the sun will be more than 20 degrees to the west in the morning sky. It will still be difficult to observe as its altitude is low in the constellation Sagittarius and its apparent diameter is on the order of 4 arc-seconds.
  The apparent diameter will exceed 6 arc-seconds in early August 2024. It will move to the constellation Taurus in prograde motion and its altitude will be sufficient. The elongation will exceed 60 degrees, and the next observation season will begin.
( 25 November 2023, Masami MURAKAMI, Hideyuki ASAI )

 C. This Apparition has Ended

  Mars passed through the Beehive Cluster (Praesepe) in Cancer in early June, entered Leo in late June, and is approaching Regulus. The closest approach will be around July 10th. The apparent diameter is getting small as δ=4.2" at the beginning of July. The altitude at sunset is also low and the observation period has ended.

  The next approach will be in January 2025, and the closest approach will be at 13.6 Hour (UTC) on January 12th. It will be a small approach with a maximum apparent diameter of δ=14.6".

( 1 July 2023, Masami MURAKAMI, Hideyuki ASAI )

 B. Mars has moved from Taurus to Gemini

  Mars drew a loop in Taurus during this approach, then moved prograde, and swiftly entered Gemini at the end of March.

  It can still be seen in the western sky after sunset, but its apparent diameter fell below 6 arcseconds in mid-April, and the observation season has reached its final stage.

( 4 April 2023, Masami MURAKAMI, Hideyuki ASAI )

 A. Comet ZTF (C/2022 E3) to pass by Mars

  Comet ZTF (C/2022 E3), which is currently approaching the earth and brightening to naked-eye magnitude, will pass by Mars around February 11 after its closest approach to the earth (February 2.2 UTC, 0.284 AU) and go south. It must have faded to magnitude 7 by then, but you are encouraged to take a look.

( 24 January 2023, Masami MURAKAMI, Hideyuki ASAI )


 A. 2022/23 Gallery Open

 B. Planets at Dawn

 C. Occurrence of Dust Storm Similar Martian Season of 2020

 D. Possibility of Martian flares at Edom Promontorium


 A. This Apparition of Mars is Closing

 B. The ASJ Award for the Outstanding Achievement by Amateur

 C. Conjunction 2021


 A. Mars is Now in Scorpius

 B. Now in a Favorable Mars Observing Period

 C. Mars is Getting Closer

 D. Detection of the shadow of AMEC

 E. A Dust Storm Occurrence at the Southern Early Fall (after λ=300°~Ls )


 A. Crucial Loss

 B. A Biographical Note on Masatsugu MINAMI by William SHEEHAN

 C. Mars is Now in Virgo at Dawn


 Aa. It Was Our Pleasure to See the Planet Mars Came Back Now to Shine in the Morning Sky

 Ab. The 2018 Apparition of Mars Has just Begun

 B. Oxus Dark Segment

 Ca. Entrainment of a dust disturbance at λ=185°Ls

 Cb. Resonances at the beginning of June and aftermath.

 Cc. We here show how the overview of the Martian surface changed within a few days:

 Cd. The images here show several work from 9 June 2018 (λ=190°Ls)

 D. Notable dust disturbance seen at the following area of Sinus Meridiani down to the northern end of Margaritifer Sinus (including Oxia P).


 A. Conjunction of Mars with Neptune on 1 January 2017

 B. Dust disturbances at the Eos area around 18 January 2017 (λ=301°Ls)

 C. The Dust Disturbances continue


 A. Mars is Now Considerably High up in the Eastern Sky at Dawn

 B. The Planet Mars now Shines in the Vicinity of Antares ( α Scorpii) at midnight


 A. Great Loss

 B. The planet Mars Has Moved to the Morning Sky


 A. The Planet Mars Shines Now in the Morning Sky

 B. Don PARKER Leads the Mars Observation Race this Apparition!

 C. Occurrence of an Arctic Polar Cyclonic Cloud


 A. Conjunction this Year

 B. Mars is Now in the Morning Sky


 A. The Planet Mars Will be Closest to the Earth on 5 March 2012

 B. Protrusions from the Dawn Terminator

 C. End of the 2011/12 Apparition


  A. No Martian Opposition This Year

  B. Conjunction

  C. The Planet Mars Passed the Time of Conjunction with the Sun

  D. The Planet Mars Has Come Back in the Morning Sky

  E. The planet Mars will attain the apparent diameter δ=9.0"


  A. The Planet Mars Is Now Approaching

  B. Mars Is Going Away

  C. Establishment of the International Society of the Mars Observers (ISMO)

  D. Reformation of the Staff of the OAA Mars Section

  E. Animation of Mars in 2010 by Martin LEWIS

  F. Death of Professor Audouin DOLLFUS


  A. Mars Is Now to the West Side of the Sun just after Conjunction

  B. First Announcement of the IWCMO

  C. The Planet Mars Is Now Come Back in the Morning Sky

  D. Programme of the IWCMO

  E. Final Announcement of the IWCMO

  F. The IWCMO Has Been Successfully Held in Paris and Meudon


  A. First Announcement in 2008

  B. CAPEN Crater on Mars

  C. 2007/2008 Mars Apparition Ended


  A.  Mars is Now Back in the Eastern Sky

  B.  Welcome to the New 2007/2008 CMO Mars Gallery

  C.  Noachis dust has been entrained!

  D.  Origin of the Present Noachis Dust Storm

  E.  Subsidence of the Noachis Dust Storm

  F.  Resonant Dust Cores at Nilokeras

  G.  MIYAMOTO Crater on Mars

  H. Sean WALKER's Animated Globe in 2007


  A.   SAHEKI Crater on Mars

  B.  The 20th Anniversary of the CMO, and the 10th Anniversary of the CMO-Web

  C. The 2005 Mars Apparition Ended

  D. 2006 Mars at Conjunction

  D bis. Mars Now


  A.   The spc is coming, just before the southern vernal equinox

  B.   Now the season has come when the centre of the spc starts to deviate from the south pole

  C.   Noachis at λ=250°Ls

  D.   Solis L area at λ=300°Ls

  E.  Chicken at Mt Hamilton

  F.   Yellow Planet again at Opposition


  A.   2004 Lowell Conference at Anamidzu

  B.   First Conference on Percival Lowell at Anamidzu in 2004

  C.   Bill SHEEHAN

  D.   Mars Conjunction

  E.   Our planet has come back in the morning sky


 A.  First CMO Announcement in 2003

 B.  The 11th CMO Meeting was successfully held on 3, 4 and 5 May 2003

 C.  Spectacular Dust Storm was observed here in Japan from 4 July through 8 July 2003

 D.  Great! but Yellow Planet

 E.  The biggest Mars on 27 August 2003

 F.  M Serpentis still darkened and widened

 G.  December storm


 A.   Jeff D BEISH, ALPO Mars Section and Computing Section, visited Japan and kindly gave an interesting talk to the CMO Members on 24 March at Yokohama.

 B.   The CMO Editors interviewed Sanenobu FUKUI, now 86 of age living in Yokohama, and listened to his talk about his finding of a Sun-glint flare seen near Solis Lacus on 10 November 1958.

  1)  Bill SHEEHAN communicated a comment to us on the results of the water distribution over the Martian surface revealed by Odyssey's neutron spectrometer:
  2)  Tom DOBBINS (11 May) suggested us to refer to the S&T Site on Odyssey's result.

 D.   The 10th CMO Meeting:
  The 10th CMO Planetary Observers Meeting was held at Ina City, Nagano Prefecture, from the night of 2 August to the morning of 5 August 2002.


 A. Edom Brightening on 7 and 8 June

 B. Yellow Dust Cloud

 C. The 9th CMO Meeting of the Mars Observers was successfully held at Okinawa on 20, 21 and 22 July.

This Web-Site is
Edited by Masatsugu MINAMI and
Maintained by Masami MURAKAMI (cmo@mars.dti.ne.jp) , and Akinori NISHITA .

Last updated on 9 July 2018

CMO/ISMO Index Page
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to Japanese webpage

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First uploaded on 7 February 2022
Last updated on 6 September 2023

PDF CMO versions from #300 (Dec 2004)

Old CMO Index from CMO #174 (April 1996)
to #289 (April 2004) (in Web versions)

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First uploaded on 1 January 2020
Last updated on 19 July 2021

2020 Mars Projection Maps
3) Damian A PEACH
2) Martin R LEWIS
1) Teruaki KUMAMORI

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First uploaded on 12 October 2017
Last updated on 23 May 2019

2018 Mars Projection Maps
2) Damian PEACH
1) Robert HEFFNER

First uploaded on 23 November 2015
Last updated on 14 May 2017

2016 Mars Projection Maps
1) Teruaki KUMAMORI

First uploaded on 1 September 2013
Last updated on 14 April 2015

2013/2014 Mars Projection Maps
2) Martin R LEWIS
1) Teruaki KUMAMORI

First uploaded on 1 August 2011
Last updated on 27 October 2012

Gallery Watching in 2011/12

2011/2012 Mars Projection Maps
1) Damian PEACH
2) Martin LEWIS

First uploaded on 3 April 2009
Closed on 29 August 2010
Revised on 17 September 2010

1) Teruaki KUMAMORI
2) Martin LEWIS           
3) Damian PEACH         

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First uploaded on 9 April 2007
Closed on 6 August 2008
Revised on 7 October 2008

First uploaded on 1 January 2005

Last updated on 26 November 2006
at 09:00 GMT

Uploaded on 2 January 2006

1 ) Bill DICKINSON       
2 ) Christophe PELLIER
(projection map, see LtE)
3 ) Christophe PELLIER
(polar regions, see LtE)
4 ) Robert HEFFNER     
5 ) Jan ADELAAR           
6 ) Damian PEACH          

Last updated on 15 October 2005
This Site of CMO Lowell Page was first uploaded on
15 September 2002

2004 Lowell Conference
at Anamidzu
(2 - 5 May 2004)

Last updated on 14 May 2004
Revised April 2007

Our CMO Web for the 2003 Mars images,
first uploaded on 18 November 2002

Final updating on 15 June 2004 at 08:30 GMT

Also click here for Director's Notices in 2003

2001 Mars Images after the Onset of the Global Dust Storm on 24 June 2001

The International MarsWatch 2001 Information
2001 Dust Storm on Mars!

2001 Mars Images up
until the major dust storm was onset

Here is a history of the CMO Meetings of Planetary Observers
first uploaded on 23 Sept 2002

c) Total Solar Eclipse on 4 December 2002
b) Solar Eclipse on 10 June
a) Our 2001 Leonids

On the Mars Observation Scheme Employed at Fukui in 2007/2008 (PDF 0.6MB)

Masatsugu MINAMI and Takashi NAKAJIMA
Mars Observations in 2005. Part III (PDF 1.3MB)
Masatsugu MINAMI
Mars Observations in 2005. Part II (PDF 0.2MB)
Mars Observations in 2005. Part I (PDF 0.8MB)
Mars Observations in 2003. Part II (PDF 3.5MB)
Mars Observations in 2003. Part I (PDF 0.6MB)
Mars Observations in 2001, Part III (PDF13.5MB)
Mars in 2001, Part II (PDF1.7MB)
Mars in 2001, Part I (PDF 1.5MB)
Mars in 1999 (PDF 1.9MB)
Mars in 1996/97 (PDF 73.1MB)
Mars in 1994/95 (PDF 47.8MB)
Mars in 1992/93 (PDF 44.6MB)
Mars in 1990/91 (Japanese only)
  (PDF 33.7MB)

All published by
The Fukui City Museum of Natural History


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