Georgia Journal of Science

Article Title

The Moon's Brightness during the January 21, 2019 Total Lunar Eclipse


The writer measured the brightness of the Moon during the January 21, 2019 total lunar eclipse. He used a single channel SSP-3 photometer along with filters transformed to the Johnson B and V system. He also used a small telescope having a diameter of 0.030 m with a focal length of 0.12 m. This combination produced a field of view of 56 arc-minutes which is large enough to cover the entire Moon. Data were collected between 4:43 and 5:31 U.T. on January 21, 2019. The V-filter brightness dropped from -3.18 at 4:43 UT to -2.04 at 5:13:30 UT. Afterwards, it rose back to -2.70 magnitude by 5:31 UT. The B-filter brightness (in magnitudes) went from -1.76 at 4:45 UT to -0.32 at 5:14:30 to -0.98 at 5:30:30 UT. The corresponding B-V value was 1.72 at minimum brightness. This is much higher than the corresponding value of the uneclipsed Moon. It is concluded that fully eclipsed Moon reached a similar brightness as similar events since 2000.

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