Sirona - LouisB3/Grannus-Expansion-Pack GitHub Wiki
Description
While relatively small as far as gas giants go, Sirona is the undisputed boss of her planetary neighborhood. Her disc reflects enough of Grannus' light toward Gael that her existence has been known ever since the first modern telescopes were turned in her direction. Always the faithful companion to Grannus, Sirona never strays far from his warm embrace. Her faint light can be seen moving to and fro in a never ending dance.
If GEP_Primary is installed:
While relatively small as far as gas giants go, Sirona is the undisputed boss of her planetary neighborhood. Shining brightly in Nodens' nighttime sky, Sirona's existence has been known to Kerbals since ancient times. Once worshipped as a deity, Sirona is now the subject of intensive scientific study.
Notes
Parameters
| Bulk parameters | |
|---|---|
| Classification | Planet, gas giant |
| Radius | 3,000 km datum |
| Mass | 1.32243×10^24 kg |
| Gravitational parameter | 8.825985×10^13 m^3/s^2 |
| Mean density | 11,690 kg/m^3 |
| Surface gravity | 1 g |
| Escape velocity | 7,671 m/s |
| Bond albedo | 0.4 |
| Solar irradiance | 57.9 W/m2 |
| Black-body temperature | 111 K |
| Natural satellites | Airmed, Brovo, Damona |
| Orbital & rotational parameters | |
|---|---|
| Semimajor axis | 11,900,000 km |
| Perihelion | 11,424,000 km |
| Aphelion | 12,376,000 km |
| Orbit eccentricity | 0.04 |
| Orbit inclination | 10°, 0.87° to ecliptic |
| Longitude of ascending node | 150° |
| Argument of periapsis | 0° |
| Sidereal orbit period | 473.00 days |
| Synodic period | N/A |
| Mean orbital velocity | 7,318 m/s |
| Sidereal rotation period | 16.000 hours |
| Solar day | 16.091 hours |
| Obliquity to orbit | 10° |
| Synchronous orbit altitude | 16,502 km |
| Sphere of influence | 340,490 km |
| Atmosphere | |
|---|---|
| Overall height | 450,000 m |
| Pressure | 100 atm datum, 1 atm @ 125 km |
| Mean temperature | 500 K datum, 145 K @ 125 km |
| Mean molecular weight | 2.59 g/mol |
| Composition | 83% H2, 15% He, 2% CH4 |
- Days based on Kerbin solar day of 6 hours.
- Years based on Kerbin year of 426 six-hour days (2,556 hours total).
- Ecliptic plane for Grannus is defined by the plane containing Nodens’ orbit.