MBH728: yellow dwarf star with 5 planets

Solar system 'MBH728' comprises the star 'MBH728' and the retinue of celestial objects gravitationally bound to it: 5 planets and their 149 moons, as well as asteroids, meteoroids, planetoids, comets, and interplanetary dust.

The principal component of this star system is the star 'MBH728', a yellow dwarf class star that contains about 99.99% of the system's known mass and dominates it gravitationally. MBH728 is located more than 2819 lightyears from the center of the galaxy.

MBH728.3, the third planet in this system, may feature life forms. Its average temperature is 346K (73C) and it's atmosphere contains 18% of oxygen. One year on MBH728.3 lasts 765 days, one day lasts 7 hours. It's diameter is 18660 km, 1.4 times the diameter of the Earth.

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This solar system comprises 5 planets

	MBH728.1 is a very small terrestrial planet (2697 km radius) which orbits its star in 72 Earth days, one day on MBH728.1 lasts 39 Earth hours. Its average temperature is 1326 K (1053 C), its atmosphere mainly consists of nitrogen and it has 0 moons.
	MBH728.2 is a small terrestrial planet (4523 km radius) which orbits its star in 134 Earth days, one day on MBH728.2 lasts 17 Earth hours. Its average temperature is 1179 K (906 C), its atmosphere mainly consists of hydrogen, nitrogen, oxygen and it has 2 moons.
	MBH728.3 is a very large terrestrial planet (9330 km radius) which orbits its star in 765 Earth days, one day on MBH728.3 lasts 7 Earth hours. Its average temperature is 346 K (73 C), its atmosphere mainly consists of nitrogen, oxygen and it has 42 moons.
	MBH728.4 is a very large terrestrial planet (9543 km radius) which orbits its star in 1406 Earth days, one day on MBH728.4 lasts 7 Earth hours. Its average temperature is 205 K (-68 C), its atmosphere mainly consists of nitrogen, oxygen and it has 17 moons.
	MBH728.5 is a medium gas giant (22955 km radius) which orbits its star in 20451 Earth days, one day on MBH728.5 lasts 5 Earth hours. Its average temperature is 1676 K (1403 C), its atmosphere mainly consists of hydrogen, helium and it has 88 moons.
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Planetary Statistics

planet:	MBH728.1	MBH728.2	MBH728.3	MBH728.4	MBH728.5
distance from star:	23*10⁶ km	35*10⁶ km	113*10⁶ km	170*10⁶ km	1016*10⁶ km
radius:	2697 km	4523 km	9330 km	9543 km	22955 km
mass:	156*10²¹ kg	740*10²¹ kg	6497*10²¹ kg	6952*10²¹ kg	96765*10²¹ kg
surface gravity:	1.43 m/s² 0.14 Earths	2.41 m/s² 0.24 Earths	4.98 m/s² 0.50 Earths	5.09 m/s² 0.52 Earths	12.2 m/s² 1.24 Earths
escape velocity:	2.778 km/s	4.673 km/s	9.641 km/s	9.861 km/s	23.72 km/s
year:	44 MBH728.1 days 72 Earth days	189 MBH728.2 days 134 Earth days	2622 MBH728.3 days 765 Earth days	4820 MBH728.4 days 1406 Earth days	98164 MBH728.5 days 20451 Earth days
day:	39 hrs	17 hrs	7 hrs	7 hrs	5 hrs
axial tilt:	29°	20°	10°	21°	85°
temperature:	1326 K 1053 C	1179 K 906 C	346 K 73 C	205 K -68 C	1676 K 1403 C
atmosphere:	88% N2 6% O2 6% CO2 0% other	20% H2 4% He 31% N2 45% O2 0% other	82% N2 18% O2 0% other	5% H2 1% He 58% N2 35% O2 1% CO2 0% other	82% H2 18% He 0% other
moons:	0	2	42	17	88
rings:	0	0	0	0	3

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