User:Amit6/infmars

Mars
	Mars as seen by the Hubble Space Telescope
Designations
Adjectives	Martian
Symbol
Orbital characteristics
	Epoch J2000
Aphelion	249,209,300 km; 1.665 861 AU
Perihelion	206,669,000 km; 1.381 497 AU
Semi-major axis	227,939,100 km; 1.523 679 AU
Eccentricity	0.093 315;
Orbital period (sidereal)	686.971 day; 1.8808 Julian years; 668.5991 sols
Orbital period (synodic)	779.96 day; 2.135 Julian years
Average orbital speed	24.077 km/s
Inclination	1.850°; 5.65° to Sun's Equator
Longitude of ascending node	49.562°
Argument of perihelion	286.537°
Known satellites	2
Physical characteristics
Equatorial radius	3 396.2 ± 0.1 km[a]; 0.533 Earths
Polar radius	3 376.2 ± 0.1 km[a]; 0.531 Earths
Flattening	0.005 89 ± 0.000 15
Surface area	144,798,500 km²; 0.284 Earths
Volume	1.6318×1011 km³; 0.151 Earths
Mass	6.4185×1023 kg; 0.107 Earths
Mean density	3.934 g/cm³
Surface gravity	3.69 m/s²; 0.376 g
Escape velocity	5.027 km/s
Sidereal rotation period	1.025 957 day; 24.622 96 h
Equatorial rotation velocity	868.22 km/h (241.17 m/s)
Axial tilt	25.19°
North pole right ascension	21 h 10 min 44 s; 317.681 43°
North pole declination	52.886 50°
Albedo	0.15
Apparent magnitude	+1.8 to −2.91
Angular diameter	3.5—25.1"
Atmosphere
Surface pressure	0.7–0.9 kPa
Composition by volume	95.72% Carbon dioxide; 2.7% Nitrogen; 1.6% Argon; 0.2% Oxygen; 0.07% Carbon monoxide; 0.03% Water vapor; 0.01% Nitric oxide; 2.5 ppm Neon; 300 ppb Krypton; 130 ppb Formaldehyde; 80 ppb Xenon; 30 ppb Ozone; 10 ppb Methane;

^ Yeomans, Donald K. (2006-07-13). "HORIZONS System". NASA JPL. Retrieved 2007-08-08. — At the site, go to the "web interface" then select "Ephemeris Type: ELEMENTS", "Target Body: Mars" and "Center: Sun".
^ ^a ^b Seidelmann, P. Kenneth; Archinal, B. A.; a'Hearn, M. F.; Conrad, A.; Consolmagno, G. J.; Hestroffer, D.; Hilton, J. L.; Krasinsky, G. A.; Neumann, G.; Oberst, J.; Stooke, P.; Tedesco, E. F.; Tholen, D. J.; Thomas, P. C.; Williams, I. P. (2007). "Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements: 2006". Celestial Mechanics and Dynamical Astronomy. 98 (3): 155–180. doi:10.1007/s10569-007-9072-y. Retrieved 2007-08-28.{{cite journal}}: CS1 maint: date and year (link)
^ ^a ^b "Mars: Facts & Figures". NASA. Retrieved 2007-03-06.
^ ^a ^b ^c Cite error: The named reference nssdc was invoked but never defined (see the help page).