File:Mercury Transit Observed at Cerro Tololo Inter-American Observatory (iotw1948a).jpg

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Mercury Transit Observed at Cerro Tololo Inter-American Observatory

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Description	English: Mercury Transit Observed at Cerro Tololo Inter-American Observatory
Date	27 November 2019 (upload date)
Source	Mercury Transit Observed at Cerro Tololo Inter-American Observatory
Author	CTIO/NOIRLab/NSF/AURA
Other versions	TIFF version

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Author	Daniel Munizaga dmunizga@gmail.com
Copyright holder	EPO/CTIO/AURA
Credit/Provider	CTIO/NOIRLab/NSF/AURA
Source	NSF's NOIRLab
Short title	Mercury Transit Observed at Cerro Tololo Inter-American Observatory
Image title	Transit image with a twist (and a turn!) About 13 times per century, fleeting Mercury can be seen passing directly in front of the Sun in what is called a transit. The most recent Mercury transit occurred on 11 November 11, 2019. Teams on Cerro Tololo Inter-American Observatory (CTIO) and Kitt Peak National Observatory (KPNO) developed observing plans in an effort to recreate an experiment to calculate the Earth-Sun distance. CTIO’s Daniel Munizaga obtained this image of the transit with a 6-inch Celestron Nexstar telescope and a Nikon D750 camera by taking images every five minutes. While the path of Mercury across the Sun in fact traced a straight line, in this image the path appears to loop backwards due to an effect called field rotation as the telescope and camera track across the sky. Juan Seguel also imaged the transit of Mercury from CTIO, accompanied by students from the Universidad de La Serena. They imaged the transit with an 11-inch Nexstar telescope and ZWO 1600MM Pro camera equipped with a Fastar system. Simultaneously, Rob Sparks led a team of students from Ha:san Preparatory and Leadership School imaging the transit on Kitt Peak with an 8-inch Nexstar telescope and Canon 6d camera. Kitt Peak suffereddealt with clouds and could only image part of the transit. The goal of having two widely separated teams imaging the transit is to recreate the historic measurement of the distance from the Earth to the Sun. Mercury will appear in slightly different positions on the Sun owingdue to parallax. By carefully measuring the difference in Mercury’s position, and knowing how far apart the observers were, the distance to the Sun can be calculated. Teams will not have another opportunity to attempt this observation until the next transit of Mercury on 14 November 14, 2032.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	03:00, 27 November 2019
Software used	Adobe Photoshop CC 2019 (Macintosh)
File change date and time	01:29, 27 November 2019
Serial number of camera	3170831
Lens used	0.0 mm f/0.0
Date and time of digitizing	09:34, 11 November 2019
Date metadata was last modified	02:29, 27 November 2019
Unique ID of original document	91D8504768DED4BACD3FD68352358E35
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA
IIM version	4

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