Talk:Viking program

message: Within a magazine's context I read part of the data collected from the Viking Mars mission was lost. Is that true? --Abdull 15:43, 22 October 2005 (UTC)
thread_title:  Lost data 

message: If possible, I believe this page should include the end of the Viking probe:
http://science.slashdot.org/comments.pl?sid=191776&cid=15755314
Basically, I don't know if that's true or not, so I believe it should be considered until we can get an authoritive answer in one place.
: "Battery failure" appears correct for Viking 2's lander. "Faulty command" is correct for Viking 1. The Slashdotter's indignation over "revisionist history" looks to me like confusion between 1 and 2.  gparker 06:55, 30 September 2006 (UTC)
replies: text:  Agreed, Gparker. Either way, wikipedia internally should agree, so I synched up the reasons for failure with the reasons in the Viking 1 and Viking 2 articles. The former article is well sourced, the latter does not appear to be in contention. Porkrind 04:02, 17 August 2007 (UTC)
thread_title:  end of Viking Lander 

message: The article quotes a delta-v as "1480 m/s" for the Viking Orbiter.  Since delta-v is an acceleration the unit should be m/s^2, but 1480 m/s^2 is much too large (amounting to nearly 150 g!)  The correct figure would appear to be an initial 0.57 m/s^2 (1323N/2328kg=0.568m/s^2  -- figures taken from the article).  Alternatively the article could mean that the rocket engine could change the velocity of the spacecraft by 1480 m/s, but this would depend on how long the engine was running.  A similar use of the terms above occurs in the Lander section.  Could someone who knows more than me either correct the article or correct me!  Thanks —The preceding unsigned comment was added by Hammerandfeather (talk • contribs) 20:10, 27 February 2007 (UTC)
replies: text: Delta-v means total change in velocity. It implies an acceleration, but it doesn't give the magnitude of the acceleration. It's like stepping on the gas in your car to speed up. If you go from 40mph to 60mph, that's a delta-v of 20mph. That particular fact doesn't, however, reveal the acceleration which the car suffered during that transition. More information is needed. For example, if you know that the car goes from 40 to 60 in 10-seconds, then the acceleration is knowable, namely in this case an average of 2mph/second.    — Preceding unsigned comment added by 24.223.130.32 (talk) 02:10, 1 October 2015 (UTC)

text: The units in the article are correct.  A thrust of 1323 N acting on a spacecraft of mass 3527 kg gives an acceleration of 1323/3527 = 0.3751 m/s^2.  The orbit insertion burn built up the 1480 m/s delta-v over a period of about 3946 seconds.  (A more accurate calculation would account for the reduced mass due to expending propellant.) Old Viking (talk) 03:24, 4 October 2011 (UTC)
thread_title:  Confusion over delta-v? 

message: *Between the Universes album by Tritonus, song 'Mars Detection'.
*PXR5 album by Hawkwind, song 'Uncle Sam's On Mars'.
AMCKen (talk) 05:38, 10 April 2009 (UTC)
thread_title: In Popular Culture

message: The following comment was posted in the main article space by User:76.169.229.208
The above seems in error. The JPL website says Thermoelectric generators provided the power for the Viking landers.
"For example, the Viking landers, each with a radioisotope thermoelectric generator, landed on Mars in 1976 and operated on Mars for four and six years respectively."
(direct quote from the jpl website http://mars.jpl.nasa.gov/msl/mission/technology/technologiesofbroadbenefit/power/)
Someone who knows wikipedia better can please reformat this and the citation?
Re-posted by  Velella  Velella Talk   22:11, 1 December 2011 (UTC)
thread_title: Power

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thread_title:  External links modified 

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