Mercury  

Mercury

Mercury
Orbital Characteristics of Mercury

Orbital Characteristics

Perihelion: 46,001,200 km, 0.307499 AE
Aphelion: 69,816,900 km, 0.466697 AE
Semi-major axis: 57,909,100 km, 0.387098 AE
Eccentricity: 0.205630
Orbital period: 87.9691 days, 0.240846 years
Synodic period: 115.88 days
Average orbital speed: 47.87 km/s
Mean anomaly: 174.796°
Inclination: 7.005°
Longitude of ascending node: 48.331°
Argument of perihelion: 29.124°

Satellites/moons: 0

Physical Characteristics of Mercury

Physical Characteristics

Equatorial radius: 2,439.7 km (0.3829 x Earth)
Flattening: < 0.0006
Surface area: 7.48×1070.108 km2 ( x Earth)
Volume: 6.083×1010 km3 (0.054 x Earth)
Mass: 3.3022×1023 kg (0.055 x Earth)
Mean density: 5.427 g/cm3
Equatorial surface gravity: 3.7 m/s2
Escape velocity: 4.25 km/s
Sidereal rotation period: 58.646 Earth days, 1407.5 Earth hours
Axial tilt : 2.11′ ± 0.1′
Albedo: 0.106
Average surface temperatures: 100/700 K, -173/427 °C, -279/801 °F
Apparent magnitude: −1.9
Angular diameter: 4.5" – 13"
The Atmosphere of Mercury

The Atmosphere

Composition:
  • 42% Oxygen (O2)
  • 29.0% Sodium
  • 22.0% Hydrogen (H2)
  • 6.0% Helium
  • 0.5% Potassium
  • Trace amounts of Argon, Nitrogen (N2), Carbon Dioxide (CO2), water vapor (H2O), Xenon, Krypton, Neon

    Mercury images:


    www.flickr.com

    back to main page

  • NASA Breaking News


    Media Invited to Demonstration of NASA UAS Traffic Management Technologies
    Media are invited to see the latest technologies NASA is working on as part of its Unmanned Aircraft System (UAS) Traffic Management (UTM) project Thursday, May 25, at the Reno-Stead Airport in Reno, Nevada.
    read more...

    NASA TV Coverage Set for May 23 Space Station Contingency Spacewalk
    NASA astronauts Peggy Whitson and Jack Fischer are preparing for an unscheduled spacewalk outside the International Space Station Tuesday, May 23. Live coverage will begin at 6:30 a.m. EDT on NASA Television and the agency’s website.
    read more...

    NASA to Discuss First Science Results from Juno Mission to Jupiter
    Scientists from NASA’s Juno mission to Jupiter will discuss their first in-depth science results in a media teleconference at 2 p.m. EDT Thursday, May 25, when multiple papers with early findings will be published online by the journal Science and Geophysical Research Letters.
    read more...

    NASA to Discuss FY2018 Budget Proposal, Provide Virtual Tours of Centers
    NASA will hold a series of events May 23, highlighting the agency’s Fiscal Year 2018 budget proposal, including a televised State of NASA address by acting Administrator Robert Lightfoot and Facebook Live virtual tours of NASA’s 10 centers, where innovation is enabling exploration and discovery.
    read more...

    Two NASA Astronauts Inducted into U.S. Astronaut Hall of Fame
    Two veteran NASA astronauts, Ellen Ochoa and Michael Foale, joined the ranks of the U.S. Astronaut Hall of Fame Friday.
    read more...

    NASA Highlights Science on Next Resupply Mission to International Space Station
    NASA will host a media teleconference at 10 a.m. EDT Friday, May 26, to discuss select science investigations launching on the next SpaceX commercial resupply flight to the International Space Station.
    read more...

    NASA Selects Facilities Operations, Maintenance Support Services Contractor
    NASA has selected URS Federal Services Inc. of Germantown, Maryland, to provide facilities operations and maintenance support services at the agency’s Marshall Space Flight Center in Huntsville, Alabama.
    read more...

    Utah Students to Speak to NASA Astronauts on International Space Station
    Utah students will speak with NASA astronauts living and working aboard the International Space Station at 12:40 p.m. EDT Friday, May 19. The 20-minute, Earth-to-space call will air live on NASA Television and the agency’s website.
    read more...

    NASA Astronauts Inducted into Hall of Fame, Live May 19 on NASA Television
    Two NASA astronauts, both with one-of-a-kind career credits, will be honored Friday, May 19, when they are inducted into the U.S. Astronaut Hall of Fame. The ceremony will air live on NASA Television and the agency’s website at 1 p.m. EDT.
    read more...

    NASA Holds Media Teleconference Today on Exploration Mission-1 Status
    NASA will provide an update on the status of Exploration Mission-1, the first integrated flight of NASA’s Space Launch System (SLS) rocket and Orion spacecraft, during a media teleconference at 3 p.m. EDT today, May 12.
    read more...