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Transit of Mercury

November 15, 1999

To Read Transit Data Reports, Click HERE
To Read AAAA Observing Reports, Click HERE.

Don't forget to observe the transit of Mercury on November 15th! 

According to the RASC Observer's Handbook for 1999, page 177, the times for the Transit of Mercury on November 15 are as follows. All times are UT. Please adjust for your local time zone. These times are valid for the area of the center of the region of visibility.

Geocentric Phases of the 1999 Transit of Mercury
Contact I: 21:15:01  PA 32 degrees
Contact II: 21:29:44  PA 27 degrees
Greatest: 21:40:53
Contact III: 21:52:03  PA 19 degrees
Contact IV: 22:06:47  PA 14 degrees

Observers in the continental United States will see the event a bit earlier.

Phases of the 1999 Transit of Mercury 
From the Continental United States

Contact I: 4:11 PM 3:11 PM 2:11 PM 1:11 PM
Contact II: 4:23 PM 3:22 PM 2:23 PM 1:23 PM
Greatest: 4:41 PM 3:41 PM 2:41 PM 1:41 PM
Contact III: 4:59 PM 3:59 PM 2:59 PM 1:59 PM
Contact IV: 5:10 PM 4:10 PM 2:10 PM 1:10 PM

At Contact I, the planet can be seen as a small notch on the limb of the sun. At Contact II, the entire disk of the planet can be seen. During the next 20 minutes, the planet shows a shadow against the solar disk. At Contact III, the planet reaches the other edge of the sun. Contact IV is the end of the transit.

John Westfall has written a good article about the event on pages 108-112 of the November issue of Sky and Telescope magazine. Extensive information has also been posted on ALPO's Web site, and you can link to it from the top of the IOTA site at http://www.lunar-occultations.com/iota

Bert Stevens, webmaster for the Astronomical League Web Page, has also posted an excellent article about the upcoming transit. You may read his article by clicking here. Or click on the following image of the transit  as posted on Bert's page.

Video/CCD observers are encouraged to record what they can of the Mercury transit, for those in the region of visibility.

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