2023 CMO News


 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 )


 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 )


 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 )


 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 )


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