Is jupiter getting brighter ?

Details Is jupiter getting brighter ? Is jupiter getting brighter ?

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cha%26a...8..354l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 8, Issue 4, p. 354-356.

Astronomy and Astrophysics

Astrophysics

Scientific paper

For a given planet there is a critical distance from the Sun when the planet is first or last seen. This is called Jian-Fu-Du (JFD) by ancient Chinese astronomers. TABLE 1 lists the values of JFD for the five planets as given in 33 Chinese calendars between -103 and +1368. The data show that 1) in order of decreasing brightness, we have Venus, Jupiter, Saturn and Mars, while the brightness of Mercury is the same as the last two; 2) the JFD of Jupiter is decreasing in time; and 3) the JFDs of the other four planets are increasing in time. Perhaps changes in the transparency of the Earth's atmosphere and in the brightness of the Sun cause a general increase in JFD. Then the decreasing JFD of Jupiter means that Jupiter is getting brighter in time. A rough estimate for the rate of brightening is 0.003 mag per thousand years.

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