What is Mariner 4?
{{no sources|date=September 2024}} {{Infobox spaceflight | name = Mariner 4 | image = Mariner 3 and 4.jpg | image_caption = The Mariner 4 spacecraft | mission_type = [[Mars flyby]] | operator = [[NASA]] / [[Jet Propulsion Laboratory|JPL]] | mission_duration = 3&nbsp;years, 23&nbsp;days | COSPAR_ID = 1964-077A | SATCAT = 942 | spacecraft_type = | manufacturer = [[Jet Propulsion Laboratory]] | dry_mass = | launch_mass = {{convert|260.8|kg|lb}} | power = 310&nbsp;watts (at Mars encounter) | launch_date = {{start-date|November 28, 1964, 14:22:01|timezone=yes}} UTC | launch_rocket = [[Atlas-Agena|Atlas LV-3 Agena-D]] | launch_site = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Launch Complex 12|LC-12]] | launch_contractor = | last_contact = December 21, 1967 | orbit_epoch = | orbit_semimajor = {{Convert|199591220|km|sp=us}} | orbit_eccentricity = 0.17024754 | orbit_reference = [[Heliocentric orbit|Heliocentric]] | orbit_periapsis = {{Convert|165611300|km|sp=us}} | orbit_apoapsis = {{Convert|233571130|km|sp=us}} | orbit_inclination = 2.51&nbsp;degrees | orbit_period = 562.888&nbsp;days | apsis = helion | instruments = Cosmic dust detector <br /> Cosmic ray telescope <br /> Geiger counter/ionization chamber <br /> Helium magnetometer <br /> Solar plasma probe <br />Trapped radiation detector <br /> TV camera |interplanetary = {{Infobox spaceflight/IP |type = flyby |object = [[Mars]] |distance = {{convert|9846|km|mi|abbr=off|sp=us}} |arrival_date = July 15, 1965, 01:00:57 UTC }} }} '''Mariner 4''' was a [[NASA]] [[spacecraft]]. It was the fourth spacecraft in the [[Mariner program]]. It was sent on a [[Mars flyby]] mission. It was the first s