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JPLNEWS1
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0354B.PR
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1993-04-21
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_______________
DIAMETER: 4,244 mi.
MASS: .108 that of Earth
GRAVITY: .38 that of Earth
MARTIAN DAY: 24 hr. 37 min. 22.6 sec.
MARTIAN YEAR: 686 days 23 hr. 30 min. 41 sec.
MEAN ORBITAL VELOCITY: 53,934 mph
ORBITAL INCLINATION: 1.85?o\
INCL. OF AXIS OF ROTATION: 24.8?o\
OPPOSITION WITH EARTH: 34.5 to 62.96 million mi.
PERIOD OF OPPOSITIONS: 26 months
PERIOD OF CLOSEST OPPOSITIONS: 15-17 years
MAXIMUM SURFACE TEMP: 86?o\ F
MINIMUM SURFACE TEMP: less than -100?o\F
TEMPERATURE AT EQUATOR: sunrize = -40?o\; noon = +50?o\
ATMOSPHERIC PRESSURE: 2.5% of Earth's (25 millibars)
ATMOSPHERIC CONTENT: 98% nitrogen, 1% argon, 1%
carbon dioxide
SATELLITES: ___________________________________
diameter 10 mi. 6 mi.
mean distance from surface 3,703 mi. 12,400 mi.
period of revolution 7 hrs. 40 min. 1 day 6 hrs. 22 min.
MARINER IV TV COVERAGE OF MARS*
Slant Range (mi.)
_________________ _______________________
1st picture 9,570 75,000
9th picture** 7,680 23,400
17th picture 7,370 37,000
* Calculations were made using a time of 3 min. 12 sec. after
narrow angle sensor acquisition. The shadow line will pass
through the center of picture No. 18. It is possible picture
recording could start one min. after narrow angle acquisition, in
which case the entire 18th picture would be on the sunlit side of
the planet.
** This picture will have the least oblique perspective.