This video is an attempt to reprocess and show the Mariner 4 Mars images on a modern map. Google Earth was used for this, since it allows to generate suitable viewing geometries. For most of the images the match is quite good.

The first and last photos are limb views and seem to show a reasonable amount of cloud cover. The last ones are in shadow and essentially featureless.

Initial animation and archive footage by NASA; Mars maps and globe by Google Earth.

Mariner 4 image processing and research by RetroSpace HD.


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The Mariner 4 spacecraft flew by Mars on July 15, 1965. Its closest approach was 9,846 km from the Martian surface at 01:00:57 UT July 15, 1965 (8:00:57 p.m. EST July 14), its distance to Earth was 216 million km, its speed was 7 km/s relative to Mars, 1.7 km/s relative to Earth.

Planetary science mode was turned on at 15:41:49 UT on July 14. The camera sequence started at 00:18:36 UT on July 15 (7:18:49 p.m. EST on July 14) and 21 pictures using alternate red and green filters, plus 21 lines of a 22nd picture were taken.

The images covered a discontinuous swath of Mars starting near 40° N, 170° E, down to about 35° S, 200° E, and then across to the terminator at 50° S, 255° E, representing about 1% of the planet's surface. The images taken during the flyby were stored in the on-board tape recorder.

At 02:19:11 UT, Mariner 4 passed behind Mars as seen from Earth and the radio signal ceased. The signal was reacquired at 03:13:04 UT when the spacecraft reappeared. Cruise mode was then re-established. Transmission of the taped images to Earth began about 8.5 hours after signal reacquisition and continued until August 3. All images were transmitted twice to ensure no data was missing or corrupt. Each individual photograph took approximately six hours to be transmitted back to Earth.

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A special thanks to the channel supporters ( [ Ссылка ] ):
* Darcy Barrett
* Ellie Burack
* Gary Smith
* Gio Pagliari
* Noah Soderquist
* Ryan Hardy
* Scott Manley

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#nasa #mariner4 #mars

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