2019 Transit of Mercury

Images by Glenn Schneider with a Questar and a Williams College Questar filter in collaboration with Jay Pasachoff and Bill Sheehan. Quick first reduction. At Big Bear Solar Observatory in a dome alongside the dome of its 1.6-m Goode Solar Telescope. The Questar telescope is 3.5 inch (0.089 meters) diameter aperture. The effective focal length is 1422 mm (f/16).  The Questar full-aperture solar filter has optical density 4.8. The camera used was a Nikon D800.  Images were taken at 1/1600 s at ISO 500. The full disk image was taken at C3 minus 30 seconds.
The egress limb-crossing image sequence is at a 15 second cadence.

Evan Zucker Photographs

At the Big Bear Solar Observatory, California, with the 1.6 m Goode Solar Telescope

Thanks to Claude Plymate, Teresa Bippert-Plymate, John Varsik, Nicolas Gorceix.
Our team: Jay Pasachoff, Glenn Schneider, Evan Zucker, Bill Sheehan, Muzhou Lu‘13

Views of the Mercury transit from the GOES-16 Solar Ultraviolet Imager (SUVI) in its 195Å and 304 Å passbands, between 11 and 19 UT on 2019 November 11. (Daniel B. Seaton/Univ. of Colorado/NOAA)

SUVI Movies (11/11/2019)  (Credit: Daniel B. Seaton)  

NASA’s Solar Dynamics Observatory (SDO): transit observations

A quick-look movie using the TiO speckle reconstructed data for the 2019 Mercury transit. (Big Bear Solar Observatory)

Movie From Rev. Ronald Royer

Black drop: From the Big Bear Solar Observatory –

The camera used for our Broad Band Imager uses a PCO-2000 high speed CCD normally imaging through a TiO filter (10A FWHM centered at 7057A).

Raw frame #415 that shows the moment of 3rd contact. The time stamp on the frame is 18:02:55.

Black-drop image by Alfredo Vidal <[email protected]> Solar Activity Picture of the Day for December 14, 2019. “The world wide home of active solar imagers”

Transit of Mercury 2019 Powerpoint-

Pasachoff, Jay M., Udo Backhaus, Alfred Knülle-Wenzel, and Joe J. Zender, 2019, “Measuring the Scale of the Solar System, through Transits of Mercury,“ session ODA1 at Division of Planetary Sciences/European Planetary Science Congress in Geneva, September.

Project to determine the astronomical unit (au) headed by Udo Backhaus (Germany) through coordination of observations from several widely-separated sites: http://www.transit-of-mercury2019.de
Past Transits of Venus and Mercury available at https://sites.williams.edu/transitofvenus/

Credit: Xavier Jubier

Source: http://xjubier.free.fr/en/site_pages/transits/ToM_2019.html

November 11, 2019:

Big Bear Solar Observatory in California.

Xavier Jubier’s sites


Fred Espenak’s EclipseWise site

PROBA2 Mercury-transit observations

Time-and-date.com site


Robert Lucas from Embry-Riddle Aeronautical University, Daytona Beach, Florida, with a Canon 60Da with the 800 mm mirrored lens. 

Forthcoming 21st-century transits
  • November 13, 2032
  • November 7, 2039
  • May 7, 2049
  • November 9, 2052
  • May 10, 2062
  • November 11, 2065
  • November 11, 2078
  • November 7, 2085
  • May 8, 2095
  • November 10, 2098


See Mercury by William Sheehan (Reaktion Books, 2018).
See The Sun by Leon Golub and Jay M. Pasachoff (Reaktion Books, 2017; also U. Chicago Press; http://solarcorona.com), Figure 1.