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Moon Phase



即時月相

Q. 月相和觀星有什麼關係?

(… extracts from observation report)

Color and Brightness of the Eclipsed Moon
Alan Chu

In binocular, the moon was darkish orange-red in eclipse maximum, not bright orange-red.

See the figure “LE_color.jpg”


Click to see lagre image

By eyes, the eclipsed moon was classified Level 2 in Danjon scale.

The brightness of the moon is estimated from the camera exposure data in Table 1. For instance, a correctly exposed image at F5.6, 1/60s means 4 times brighter than F2.8, 1/30s. The exposure F2.8, 4 sec is arbitrarily defined to yield Brightness = 1. On this scale, the full moon (Raw Image 0110 0002 to 0110 0003) is about 5000 times brighter than the eclipse maximum (Raw Image 0110 0016).

The curve below shows the change of moon’s brightness up to eclipse maximum. The change is not much between P1 and U1 (i.e. when the moon was inside the Earth penumbra).


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