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Lunar Features and Phenomena: A Guide for Observers

Explore the moon's features, including craters, mountain chains, and discolorations, while discovering transient phenomena like flashes of color and lunar eclipses. Learn about occultations and timing tips for observing these celestial events.

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Lunar Features and Phenomena: A Guide for Observers

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  1. The Moon • Drawing of Features • Quick! • Use scale • 0=black, 10=white • Near terminator • Quarter phases

  2. Best Features • Well defined craters • Ridges • Mountain Chains • Discolorations

  3. Copernicus (39) Tycho (86)

  4. Plato (72) Kepler (57)

  5. Archimedes (24) Alphonsus (22) Theophilus (84)

  6. Alps Mts (B) Apennine Mts (F) Altai Mts (E)

  7. Lunar Transient Phenomena • Unpredictable • Flashes of color/light • Outgassing? • Volcanism? • Illusions? • Impacts?

  8. Occultations Timing is everything!

  9. International Occultation Timing Association (IOTA) • Maps • Notice of events • Object types (planets, asteroids, stars) • Location dependent • Time dependent • Hints for observations, recording

  10. Earthshine

  11. Lunar Eclipses

  12. Danjon Brightness Scale Brightness best measured at mid-totality L = 0 Very dark eclipse. Moon almost invisible, especially at mid-totality. L = 1 Dark Eclipse, gray or brownish in coloration. Details distinguishable only with difficulty. L = 2 Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively bright. L = 3 Brick-red eclipse. Umbral shadow usually has a bright or yellow rim. L = 4 Very bright copper-red or orange eclipse. Umbral shadow has a bluish, very bright rim.

  13. Future Total Lunar Eclipses • December 21, 2010 • April 15, 2014 • October 8, 2014 • April 4, 2015 • September 28, 2015

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