Syzygial Blog

1a.u.= 149,597,893km.

Sun
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Diameter(equatorial): 1,392,000km.
Mass: 1.99x10^33g.
Density: 1.409.
Mean apparent magnitude: -26.8.
Absolute magnitude: +4.83.
Spectrum: G2.
Surface temperature: 5,500 C.
Core temperature: 15 million C.
Sidereal mean rotation period: 25.38 days.
Distance from centre of Galaxy: 25,000 ly.
Velocity round centre of Galaxy: 220 km/s.
Period of revolution round centre of Galaxy: 225 million years (1 cosmic year).
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Mercury
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Mean distance from Sun: 57.91 million kms. (0.3871 a.u.)
Diameter: 4,878 kms.
Mass: 3.3x10^26g.
Density: 5.44
Mean Orbital Velocity: 47.87km/s.
Sidereal Period: 87.969 days.
Rotation Period: 58.646 days.
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Venus
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Mean distance from Sun: 108.2 million kms. (0.723 a.u.).
Diameter: 12,104 kms.
Mass: 4.87x10^27g.
Density: 5.25
Mean Orbital Velocity: 35.02 km/s.
Sidereal Period: 224.701 days.
Rotation Period: 243.16 days.
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Earth
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Mean distance from Sun: 149,597,893kms. (1 a.u.).
Diameter(equatorial): 12,756 kms.
Mass: 5.976x10^27g.
Density: 5.517
Mean Orbital Velocity: 29.79 km/s.
Sidereal Period: 365.256 days.
Rotation Period: 23.9345 hours.
Satellites (1) Moon 3,475.6 km:diameter.
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Moon
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Distance from Earth(centre-centre):
mean- 384,400km.
perigee- 356,410km.
apogee- 406,697km.
Diameter: 3,475.6km.
Mass:7.35x10^25g.
Density: 3.342.
Revolution & Rotation period: 27.321661 days.
Synodic period: 29d 12h 44m 2.9s.
Mean orbital velocity: 3,680 km/h.
Mean magnitude(Full): -12.7.
Escape velocity: 2.38 km/s.
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Mars
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Mean distance from Sun: 227.94 million kms. (1.524 a.u.).
Diameter(equatorial): 6,794 kms.
Mass: 6.421x10^26g.
Density: 3.94
Mean Orbital Velocity: 24.1 km/s.
Sidereal Period: 686.98 days.
Rotation Period: 24.6229 hours.
Satellites (2)
Phobos 27x22x18 km:
Deimos 15x12x10 km:
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Jupiter
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Mean distance from Sun 778.34 million kms. (5.203 a.u.).
Diameter(equatorial): 143,884 kms.
Mass: 1.9x10^30g.
Density: 1.33
Mean Orbital Velocity: 13.06 km/s.
Sidereal Period: 11.86 years.
Rotation Period(equatorial): 9.841 hours.
Satellites (63+)
>100 km: diameter
Ganymede 5,268 (largest satellite in the Solar System).
Callisto 4,806
Io 3,643
Europa 3,130
Amaltea 262x146x143
Himalia 170
Thebe 110x90
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Saturn
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Mean distance from Sun: 1,427 million kms. (9.539 a.u.).
Diameter(equatorial): 120,536 kms.
Mass: 5.688x10^29g.
Density: 0.71
Mean Orbital Velocity: 9.6 km/s.
Sidereal Period: 29.458 years.
Rotation Period(equatorial): 10.233 hours.
Satellites (46+).
>100 km: diameter
Titan 5,150
Rhea 1,528
Iapetus 1,436
Dione 1,120
Tethys 1,046
Enceladus 512x495x488
Mimas 421x395x385
Hyperion 360x280x225
Phoebe 230x220x210
Janus 194x190x154
Prometheus 148x100x68
Epimetheus 138x110x110
Pandora 110x88x62
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Uranus
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Mean distance from Sun:2,869.6 million kms. (19.181a.u.).
Diameter(equatorial): 51,118 kms.
Mass: 8.684x10^28g.
Density: 1.27
Mean Orbital Velocity: 6.9 km/s.
Sidereal Period: 84.01 years.
Rotation Period: 17.24 hours.
Satellites (27+).
>100 km: diameter
Titania 1,578
Oberon 1,523
Umbriel 1,169
Ariel 1,158
Miranda 472
Puck 154
Portia 108
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Neptune
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Mean distance from Sun: 4,496.7 million kms. (30.058 a.u.).
Diameter(equatorial): 50,538 kms.
Mass: 1.024x10^29g.
Density: 2.0643
Mean Orbital Velocity: 5.43 km/s.
Sidereal Period: 164.8 years.
Rotation Period: 16.11 hours.
Satellites (13+).
>100 km: diameter
Triton 2,705
Proteus 416
Nereid 240
Larissa 192
Despina 180
Galatea 150
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Pluto
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Mean distance from Sun: 5,900 million kms. (39.5 a.u.).
Diameter: 2,324 kms.
Mass: 1.29x10^25g.
Density: 2.0
Mean Orbital Velocity: 4.7 km/s.
Sidereal Period: 247.7 years.
Rotation Period: 6.3872 days.
Satellites (3)?
>1,000km: diameter
Charon 1,270 km: diameter.