sun by the solar wind. Between April and November 1968 NASA tried to reacquire Mariner 5 to continue probing interplanetary conditions. Attempts to reacquire Mariner 5 during June, July, and early August 1968 yielded no spacecraft signal. On October 14, the receiver operator at DSS 14 obtained a lock on the Mariner 5 signal. A carrier wave was detected, but outside expected frequency limits and varying in wavelength. Signal strength changes indicated the spacecraft was in a slow roll. Nevertheless, it was possible to lock the spacecraft to an uplink signal, but no response was observed to any commands sent to it. Without telemetry and without any signal change in response to commands, there was no possibility to repair or continue to use the spacecraft. Operations were terminated at the end of the track from DSS 61 at 07:46 GMT on November 5, 1968. Instruments Two-Frequency Beacon Receiver S-Band Occultation Helium Magnetometer Ultraviolet Photometer Interplanetary Ion Plasma Probe for E/Q of 40 to 9400 Volts Celestial Mechanics Trapped Radiation Detector See also List of missions to Venus References External links Mariner 5 Mission Profile by NASA's Solar System Exploration Mariner Venus 1967 Final Project Report The Mariner 5 flight path and its determination from tracking data (now from archive.org) Derelict satellites in heliocentric orbit Mariner program Missions to Venus Spacecraft launched in 1967 Derelict space probes de:Mariner#Mariner 5