Isthylon
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 Isthylon in true color | |||||||||||||
| Designations | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adjectives | Isthylish, Isthylonian | ||||||||||||
| Orbital characteristics | |||||||||||||
| Epoch X4000 | |||||||||||||
| Aphelion | 323500000 km (201000000 mi) | ||||||||||||
| Perihelion | 312300000 km (194100000 mi) | ||||||||||||
| 314700000 km (195500000 mi) | |||||||||||||
| Eccentricity | 0.252631 | ||||||||||||
| 493 d (16.2 months) | |||||||||||||
Average orbital speed | 7.59 km/s (4.72 mi/s) | ||||||||||||
| 174.796° | |||||||||||||
| Satellites | None | ||||||||||||
| Physical characteristics | |||||||||||||
Mean diameter | 10942 km (6799 mi) | ||||||||||||
Mean radius | 5471 km (3400 mi) | ||||||||||||
| Flattening | 0.0009 | ||||||||||||
| 376134607 km (233719209 mi) | |||||||||||||
| Volume | 4.4737 × 1024 km3 | ||||||||||||
| Mass | 2.3563 x 1032 kg | ||||||||||||
Mean density | 52.67 g/cm3 | ||||||||||||
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| 9.54 km/s (5.93 mi/s) | |||||||||||||
Sidereal rotation period | 25.89437389 d (621.464973 h) | ||||||||||||
Equatorial rotation velocity | 0.0008 km/h (0.00022 m/s) | ||||||||||||
| 2.04′ ± 0.08′ (to orbit) (0.034°) | |||||||||||||
North pole declination | 61.45° | ||||||||||||
| Albedo | |||||||||||||
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| Atmosphere | |||||||||||||
Surface pressure | 85 bar (8.5 MPa) 80 atm | ||||||||||||
| Composition by volume | |||||||||||||
Isthylon is the 3rd planet from the Sun and also the 3rd smallest planet in the Gentu System. Its orbit around the Sun takes roughly 26 Gentu days, the X longest of all the Sun's planets. Isthylon's surface appears heavily cratered and is similar in appearance to Cynthia's, indicating that it has been geologically inactive for billions of years. Having almost no atmosphere to retain heat, it has surface temperatures that vary diurnally, ranging from −163 °C (−261.4 °F) at night to 22 °C (71.6 °F) during the day across the equatorial regions. The polar regions are constantly below −104 °C (−155.2 °F). The planet has no known natural satellites.
Three spacecrafts have visited Isthylon: Enquêteur 4 flew by in 1976 and 1977; Trouverbot V2, launched in 1988, orbited Isthylon over 5,000 times in five years before exhausting its fuel and crashing into the planet's surface on 24 Tebax 1997. and IATAI, which flew by it in 1998. The Sidai 7 spacecraft is planned to arrive at Isthylon in 2005.
Etymology
TBA
Physical characteristics
Internal structure
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Surface
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Habitability
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Observations
Pre-observatory
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Ground-based research
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Research with space probes
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Enquêteur 4
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Trouverbot V2
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IATAI
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Sidai 7
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