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June 28, 2006

Telescopically Speaking

D: That's not Jupiter, really. Is it?
A: Yes!
D: No. It's not red and there's no spot.
A: There is a spot.
D: There is not a spot.
A: But look! There are moons. Five, in a line.
D: Which one's Io.

Io Statistics
Discovered by Simon Marius & Galileo Galilei
Date of discovery 1610
Mass (kg) 8.94e+22
Mass (Earth = 1) 1.4960e-02
Equatorial radius (km) 1,815
Equatorial radius (Earth = 1) 2.8457e-01
Mean density (gm/cm^3) 3.55
Mean distance from Jupiter (km) 421,600
Rotational period (days) 1.769138
Orbital period (days) 1.769138
Mean orbital velocity (km/sec) 17.34
Orbital eccentricity 0.004
Orbital inclination (degrees) 0.040
Escape velocity (km/sec) 2.56
Visual geometric albedo 0.61
Mean surface temperature -143°C
Magnitude (Vo) 5.02
Source: PlanetaryExploration.net

Posted by Dipika at June 28, 2006 4:17 PM

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