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Partial Lunar Eclipse Montage (Sept. 17, 2024).jpg

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This is a montage of the minor partial eclipse of the Moon of September 17, 2024, showing the sequence from the start of the umbral phase, at left, to the end, at right. The two images in between on either side of mid-eclipse were shot at roughly equal time intervals, to show the progress of the Moon along the edge of the umbral shadow.

The middle image was taken at mid-eclipse when only 8% of the lunar disk was immersed in the Earth's umbral shadow, taking a dark bite out of the northern edge of the Full Moon. This is not enough of an eclipse to show any reddening of the umbra, unlike at a total eclipse or even a major partial eclipse.

Throughout most of the eclipse the rest of the Moon was within the lighter penumbral shadow, creating the gradient of brightness across the disk with the southern region brighter than the north.

However, more obvious is the change in colour of the lunar disk as the eclipse progresses, from yellow to whiter. That is not due to the eclipse or effect of the Earth's shadow, but is from the Moon climbing higher in the southeast over the roughly hour-long umbral phase, decreasing the amount of atmospheric absorption that yellows the disk of a low Moon. Indeed, for the first part of the eclipse the Moon was in light cloud.

Technical:
This middle mid-eclipse image is a blend of two exposures: a short 1/40-second exposure for the main disk and a longer 1/10-second exposure taken immediately after, to bring out the area at top in the umbral shadow. The others are single 1/40-second exposures.

All through the Askar APO120 refractor at f/7 with the Canon R5 at ISO 100. On the AP400 mount.
Copyright
© Alan Dyer/AmazingSky.com
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16384x5464 / 20.7MB
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My Latest, Lunar Eclipses
This is a montage of the minor partial eclipse of the Moon of September 17, 2024, showing the sequence from the start of the umbral phase, at left, to the end, at right. The two images in between on either side of mid-eclipse were shot at roughly equal time intervals, to show the progress of the Moon along the edge of the umbral shadow. <br /> <br /> The middle image was taken at mid-eclipse when only 8% of the lunar disk was immersed in the Earth's umbral shadow, taking a dark bite out of the northern edge of the Full Moon. This is not enough of an eclipse to show any reddening of the umbra, unlike at a total eclipse or even a major partial eclipse. <br /> <br /> Throughout most of the eclipse the rest of the Moon was within the lighter penumbral shadow, creating the gradient of brightness across the disk with the southern region brighter than the north. <br /> <br /> However, more obvious is the change in colour of the lunar disk as the eclipse progresses, from yellow to whiter. That is not due to the eclipse or effect of the Earth's shadow, but is from the Moon climbing higher in the southeast over the roughly hour-long umbral phase, decreasing the amount of atmospheric absorption that yellows the disk of a low Moon. Indeed, for the first part of the eclipse the Moon was in light cloud. <br /> <br /> Technical:<br /> This middle mid-eclipse image is a blend of two exposures: a short 1/40-second exposure for the main disk and a longer 1/10-second exposure taken immediately after, to bring out the area at top in the umbral shadow. The others are single 1/40-second exposures.<br /> <br /> All through the Askar APO120 refractor at f/7 with the Canon R5 at ISO 100. On the AP400 mount.