Welcome to the Communications in Mars Observations
CMO Since 1986

Issued by
the International Society of the Mars Observers
Last updated on
1 December 2022
at 06:00 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)

News 2022
2022 CMO News

 D. Possibility of Martian flares at Edom Promontorium

  CMO #514 (10 April 2022) has already published an article at the following link as "Regarding Martian flares at Edom Promontorium in December 2022".
  William Sheehan, who made a forecast in 2001 and succeeded in observing in Florida, informed us that the Martian flares observed by Tsuneo Saeki in July 1954 may be reproduced. It is understood as a reflection phenomenon of sunlight, and it is now predicted that it may be observed in the following period at geographical longitude including Japan where reflection conditions apply in this approach.

  From December 3 to 7, Japan hours from evening to midnight, Edom can be seen on Mars rising in the eastern sky, and the phenomenon may be observed. The link below introduces the situation observed at that time in 2001 and the forecast time for this event. I encourage you to look at the information and plan your observations.

  https://alpo-astronomy.org/jbeish/2022_MARS.htm   Compare -- SPECIAL EVENTS --

  https://www.kwasan.kyoto-u.ac.jp/~cmo/cmo/514/2022-23_FC04.htm (Japanese)

( 15 November 2022, Masami MURAKAMI, Hideyuki ASAI )

 C. Occurrence of Dust Storm Similar Martian Season of 2020

  Mr. Yasunobu Higa from Okinawa reported that the area between Margaritifer S and Aurorae S was brightening during the observation on September 23 GMT (λ=309°Ls). Overcast weather continued over Main Land of Japan, and no observations were confirmed. I immediately contacted every colleague and asked for confirming observation.

  On the following day, the 24th (λ=310°Ls), the weather improved and images were received, indicating the spread of dust. After that, the dust activity continued, and on the 26th (λ=311°Ls), linked dust activity occurred from Deucalionis Regio to Noachis on the east side and around Solis L on the west side.
  As of September 28, the US observations have not captured the spread beyond the east of Hellas. The western side is unknown because there is no observation from European countries.

  Similar to the dust event that occurred and spread near Chryse-Xanthe during the prior approach, Valles Marineris is clogged with dust and looks bright.
  In addition, the season is the same as that of 2005 (λ=308°Ls) and 2020 (λ=313°Ls). For the above reason, I am much interested in the event. I strongly recommend that you make the follow-up observations for the future developments.

( 29 September 2022, Masami MURAKAMI, Hideyuki ASAI )

 B. Planets at Dawn

  A series of conjunctions of bright planets at dawn have continued since this spring. The last one was the conjunction of Mars and Jupiter which occurred in the western part of Pisces at the end of May 2022.

  In June, Mars is prograde in Pisces, and the apparent diameter will exceed 7 arc-seconds. Now, it is the time to start observing Mars for this close approach.

( 14 June 2022, Masami MURAKAMI, Hideyuki ASAI )

 A. 2022/23 Gallery Open

  Dear observers, finally Mars is now visible in the morning sky in Sagittarius. In the northern hemisphere observation of the red planet is still hard for its lower altitude, but unexpectedly good quality of images for the smaller apparent diameter started to arrive from the southern hemisphere.
  We are starting Mars Gallery in this apparition to show your observations. Please submit your drawings and images to the address : cmo@mars.dti.ne.jp

Mail to : cmo@mars.dti.ne.jp

( 7 February 2022, Reiichi KONNAI, Masami MURAKAMI)


 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 .

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2004 Lowell Conference
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Our CMO Web for the 2003 Mars images,
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Also click here for Director's Notices in 2003

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until the major dust storm was onset

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

Masatsugu MINAMI and Takashi NAKAJIMA
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Mars Observations in 2005. Part II (PDF 0.2MB)
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Mars Observations in 2003. Part I (PDF 0.6MB)
Mars Observations in 2001, Part III (PDF13.5MB)
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Mars in 1996/97 (PDF 73.1MB)
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Since CMO #375
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