Equatorial Diameter
The distance accross the centre of a planet or moon.
ESA ...
The equatorial diameter of Saturn, 120,536 kilometres, is measured with respect to the one-bar pressure level in its atmosphere, for Saturn has no solid surface in its outer layers.
Name Equatorial Diameter (km) Oblateness Mass (Earth=1) Rotation Period Tilt (degrees)
Mercury
4878
0.0 ...
NumberNameEquatorial diameter
(km)Perihelion (in AU)Aphelion (in AU)Date discoveredDiscovererDiameter method
90377
Sedna ...
Having an equatorial diameter greater than the polar diameter.
obliquity - (n.)
The angle by which the spin axis of a planet to the plane of its ecliptic differs from 90°.
equatorial bulge (NASA SP-7, 1965) The excess of the earth's equatorial diameter over the polar diameter. equatorial electrojet (NASA SP-7, 1965) See electrojet.
Equatorial diameter: 12 756.274 km
Polar diameter: 12 713.505 km
Equatorial circumference: 40 075.02 km
Polar circumference: 40 007.86 km ...
Neptune has an equatorial diameter of about 30,700 mi (49,400 km), nearly four times that of the earth, and a mass about 17 times the earth's mass.
Mars has about 1/2 the equatorial diameter as the Earth, and contains about 10% of the mass of the Earth. This results in a surface gravity of about 40% of the gravity as the Earth.
Saturn is the sixth planet from the Sun and is the second largest in the solar system with an equatorial diameter of 119,300 kilometers (74,130 miles). Much of what is known about the planet is due to the Voyager explorations in 1980-81.
The Earth is not a perfect sphere but an oblate spheroid, with an equatorial diameter about 43 kilometers larger than its polar diameter.
The rotation of the Earth creates the equatorial bulge so that the equatorial diameter is 43 km larger than the pole to pole diameter.
The Sun is a near-perfect sphere, with an oblateness estimated at about 9 millionths, which means that its polar diameter differs from its equatorial diameter by only 10 km (6 mi).
It has a equatorial diameter of 74,898 miles (120,536 km) (at the cloud tops) and a polar diameter of 67,560 miles (108,728 km). This is a difference of about 10%.
8 times its equatorial diameter (JPL press release, 2001; T. Moon, 1985; Morossi and Malagnini, 1985, page 369; and Johnson and Wright, 1983, page 695), and about 10.7 times its visual luminosity.
(1 ME = 5.977 × 1024 kilograms); diameter is the ``volumetric mean diameter'' that takes into account the planet's oblateness; oblateness measures how much a planet bulges at the equator [= (equatorial - polar diameter)/(equatorial diameter)]; ...
7 miles (6,752.4 km) and an equatorial diameter of 4,220.6 miles (6,792.4 km). Mars's surface gravity is 38% of Earth's. So, the apparent size of Mars, as viewed through a telescope from Earth, will vary from as small as 13.
Oblateness The ratio of a planet's polar to its equatorial diameter.
Obliquity The degree of inclination (or tilt) of a planet's equator to its orbital plane.
Occultation The disappearance of one celestial body behind another.
decreasing its equatorial diameter by a few millimeters a year), yet does not shine as a star does. Jupiter produces heat in this way, although it is too small to be considered a brown dwarf.
However, our planet is much more rigid than Jupiter, and the effect is much smaller"the equatorial diameter is only about 40 km larger than the distance from pole to pole, a tiny difference compared with Earth's full diameter of nearly 13,000 km.
Equatorial diameter 116,340 km. Oblateness 0.1. Mass 5.7 × 1029 g = 95.2 ME; mean density 0.7 g cm-3; surface gravity 11 m s-2; Vesc 33.1 km s-1. Rotation period at equator 10h14m; at poles 10h38m. Obliquity 26°44'. Teff about 160 K. Vorb 9.
94 for the polar and equatorial diameter respectively, at mean distance, corresponding with a compression 1/14.44. These agree satisfactorily with the corresponding values 35" 21, 37" 60, 1/15'59 afterwards obtained by F. W.
Solar Distance
4.501 billion km Revolution Period
164.79 Earth years Rotation Period
16.11 hours Equatorial diameter
49,528 km Gravitational Pull
1.2 times that of the Earth Natural Satellites
13 (Tell me more!) ...
Sun Physical characteristics Equatorial diameter
12,756.3 km Surface area
5.10072×108 km2 Mass
5.9742×1024 kg Mean density
5.515 g/cm3 Surface gravity
9.78 m/s2 Escape velocity
11.18 km/s Rotation period
23.9345 hours Axial tilt
23.45° Albedo ...
A sphere flattened such that its polar diameter is smaller than its equatorial diameter.
Oblateness
The flattening of a spherical body; usually caused by rotation ...
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277. Oblate Spheroid
A sphere flattened such that its polar diameter is smaller than its equatorial diameter.
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278. Oblateness
The flattening of a spherical body; usually caused by rotation.
Oblateness - A departure from spherical shape of a body in which the body's polar diameter is smaller than its equatorial diameter ...
Bayer stars are generally third and fourth magnitude, except Altair (alpha Aql), the twelfth brightest star. Altair spins very rapidly, completing one revolution every 6.5 hours, which deforms the star. It is thought Altair's equatorial diameter is ...
0034 (0.34%), while Saturn, the most oblate of the planets has a figure of 0.108 (10.8%). Generally, the planets have an equatorial bulge and in the case of Saturn, its equatorial diameter is some 10.8% greater than its polar diameter.
 See also: Equator, Diameter, Sun, Planet, Earth
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