Mariner Mars 1964, Mariners 3 and 4 to Mars: imaging plans? |
Mariner Mars 1964, Mariners 3 and 4 to Mars: imaging plans? |
Apr 28 2005, 05:05 PM
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
I am currently working on a book about lunar exploration, but looking ahead to the next one, which will cover Mars. One question to which I think I have an answer - but I'd like to see what my fellow Mars enthusiasts think - is this:
Mariner 3 failed to leave Earth. But if it had flown successfully, what area on Mars would it have photographed? My understanding is that there was no specific plan. The MM64 press kit, for instance, says nothing about image coverage for either Mariner 3 or Mariner 4. I believe that navigation to planetary distances was still so uncertain that the flight team could not predict at launch the sub-spacecraft point at closest approach - uncertainties included the exact time of the flyby, the distance and the point at which the spacecraft would pass through the target plane. These things would be known closer to the flyby but they weren't precisely predictable at launch, so Mariner 3 never got to the stage of having an imaging plan. Am I right? Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Nov 6 2007, 09:34 PM
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Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
Little bit of history.
Mariner IV - significant proton event February 5, 1965 The class 2 solar flare of February 5 started at 17:50 U.T., reached a maximum near 18:10 U.T., and ended near 20:00 U.T. An X-ray burst was detected at 18:09 U.T. Type IV radiation was observed at meter wavelengths at Ford Davies, Texas, from 18:00 U.T. to 19:40 U.T. and at decameter wavelengths at Boulder from 18:10 U.T. to 19:05 U.T. Solar protons and possibly electrons started arriving at Mariner IV at 18:40 U.T. which, at the time , was 3500 Earth radii downstream from Earth. The optical flare consisted of double filaments which slowly drifted apart, first at 6 km/sec and later at 2 km/sec. The flare associated with this event was responsible for the largest proton event of 1964 and 1965. Proton event detected by Mariner 4's Ion Chamber Diagram description: Tape : K-0126 2400 frames extracted Transmision rate - 8 1/3 bps Time period: 05 feb 10:00 - 06 feb 19:00, year 1965 Ion Chamber experiment - 2400 measurements extracted Averaging - three frames per pixel (151,2 sec per pixel) Diagram description: Tape : K-0126 8000 frames extracted Transmision rate - 8 1/3 bps Time period: 05 feb - 09 feb, year 1965 Ion Chamber experiment - 8000 measurements extracted Averaging - ten frames per pixel (504 sec per pixel) Proton event detected by Mariner 4's Geiger-Muller B tube Tapes : K-0125,K-0126 9600 frames extracted Transmision rate - 8 1/3 bps Time period: 05 feb - 10 feb, year 1965 Geiger-Muller B tube - 2400 measurements extracted Averaging - three measurements from 12 frames per pixel (604,8 sec per pixel) Proton event detected by Mariner 4's Geiger-Muller/Ion Chamber tube Tapes : K-0125,K-0126 9600 frames extracted Transmision rate - 8 1/3 bps Time period: 05 feb - 10 feb, year 1965 Geiger-Muller/Ion Chamber tube - 2400 measurements extracted Averaging - three measurements from 12 frames per pixel (604,8 sec per pixel) Proton event detected by Mariner 4's solid-state detectors Tapes : K-0125,K-0126 19200 frames extracted Transmision rate - 8 1/3 bps Time period: 02 feb - 14 feb, year 1965 Solid-state detectors - 2400 measurements extracted Averaging - three measurements from 24 frames per pixel (1209,6 sec per pixel) Proton event detected by Mariner 4's Geiger-Muller A and C tube Tapes : K-0125,K-0126 19200 frames extracted Transmision rate - 8 1/3 bps Time period: 02 feb - 14 feb, year 1965 Geiger-Muller A tube - 2400 measurements extracted Geiger-Muller C tube - 2400 measurements extracted Averaging - three measurements from 24 frames per pixel (1209,6 sec per pixel) -------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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