Leeuw system (Hipparcos 53756)

RogerBW

1 Interstellar navigation

Destination θ ϕ ρ K
52 Psi Ursae Majoris (Arbuthnot) K1III (United Kingdom) 104 61 3.8 87
HIP:53051 (Taylor) G5 (United Kingdom) 132 0 1.1 165
HIP:57346 (Leat) K4/5V (United Kingdom) 30 9 0.58 222
HR 4285 (Fletcher) F9V (United Kingdom) 180 64 1.7 131
To → 52 Psi Ursae Majoris (Arbuthnot) HIP:53051 (Taylor) HIP:57346 (Leat) HR 4285 (Fletcher)
From ↓ θ ϕ ρ θ ϕ ρ θ ϕ ρ θ ϕ ρ
52 Psi Ursae Majoris (Arbuthnot) 1 -72 3.5 48 -61 3.7 7 -45 2.5
HIP:53051 (Taylor) 74 72 3.5 84 4 1.3 15 62 1.7
HIP:57346 (Leat) 122 61 3.7 158 -4 1.3 299 48 1.9
HR 4285 (Fletcher) 80 45 2.5 88 -62 1.7 13 -48 1.9

2 System map

ID # orbit world type size/e mass/e g/e atmosphere hydrographics temp climate day HI RVM Affinity
(a.u.) (10Mm) (C) (hours)
I 0.08 medium gas giant 10.0 200 2.0 superdense corrosive 474
0.24 asteroid belt 76 infernal 0 0 0
II 0.40 standard garden planet 0.77 0.41 0.69 very thin breathable 40% water 9 cool infinite 5 -2 3
0.58 jump point Leat
0.68 asteroid belt -68 frozen 0 1 1
1.1 jump point Taylor
1.7 jump point Fletcher
III 2.2 medium gas giant 9.2 150 1.8 superdense corrosive 143
7 moonlets -159 frozen 0 0 0
IIIa 59 tiny sulfur moon 0.38 0.02 0.15 none -182 frozen 103 -2 0 -2
IIIb 65 small ice moon 0.47 0.04 0.19 very dense mildly toxic 30% hydrocarbons -151 frozen 119 -1 0 -1
IIIc 73 standard ice moon 0.59 0.21 0.59 thin suffocating -154 frozen 143 -1 0 -1
IIId 85 small ice moon 0.50 0.04 0.15 very dense mildly toxic 80% hydrocarbons -149 frozen 178 -1 -1 -2
IIIe 96 standard ice moon 0.38 0.06 0.42 very thin suffocating -156 frozen 212 0 0 0
3 moonlets -159 frozen 0 -1 -1
3.8 jump point Arbuthnot
IV 4.0 small gas giant 3.9 15 1.0 superdense corrosive 12.1
7 moonlets -188 frozen 0 0 0
IVa 44 tiny sulfur moon 0.19 0.00 0.09 none -205 frozen 212 -2 1 -1
5 moonlets -188 frozen 0 0 0
V 6.7 small gas giant 4.5 20 0.99 superdense corrosive 250
8 moonlets -208 frozen 0 0 0
Va 46 small hadean moon 0.38 0.02 0.15 none -228 frozen 193 0 -1 -1
Vb 55 standard hadean moon 0.66 0.12 0.26 none -228 frozen 250 0 -2 -2
Vc 65 small hadean moon 0.33 0.02 0.16 none -228 frozen 328 0 0 0
Vd 80 small hadean moon 0.29 0.01 0.14 none -228 frozen 440 0 0 0
1 moonlet -208 frozen 0 0 0
VI 13 medium gas giant 10 250 2.3 superdense corrosive 18.2
3 moonlets -226 frozen 0 0 0
VIa 106 tiny sulfur moon 0.09 0.00 0.05 none -235 frozen 193 -2 1 -1
VIb 127 small hadean moon 0.27 0.01 0.13 none -240 frozen 251 0 -2 -2
VIc 152 small hadean moon 0.24 0.01 0.12 none -240 frozen 327 0 0 0
VId 191 tiny ice moon 0.22 0.00 0.09 none -231 frozen 463 0 0 0
3 moonlets -226 frozen 0 1 1
VII 22 medium gas giant 11 350 2.8 superdense corrosive 13.4
5 moonlets -237 frozen 0 0 0
VIIa 57 tiny sulfur moon 0.12 0.00 0.05 none -244 frozen 63.8 -1 0 -1
VIIb 63 tiny ice moon 0.19 0.00 0.08 none -241 frozen 73.5 0 0 0
VIIc 70 tiny ice moon 0.14 0.00 0.05 none -241 frozen 86.2 0 0 0
VIId 78 small hadean moon 0.22 0.01 0.11 none -248 frozen 101 0 -1 -1
VIIe 87 tiny ice moon 0.08 0.00 0.03 none -241 frozen 121 0 -1 -1
VIIf 97 tiny ice moon 0.11 0.00 0.03 none -241 frozen 141 0 0 0
3 moonlets -237 frozen 0 0 0

3 Habitation

British colony founded 2345.
The main inhabited body is the second planet, which has a cool but breathable atmosphere, though it’s tidally locked to the primary.

3.1 Planetology

class of star K5 V
mean distance 0.40 a.u.
perihelion 0.20 a.u.
aphelion 0.60 a.u.
axial tilt 36°
annual period 0.315 years
tidelocked
local day infinite
standard garden planet
diameter 0.77 x Earth’s
9834 km
density 0.90 x Earth’s
5.0 g/cm^3
surface gravity 0.69 g.
6.8 m/s^2
escape velocity 8.2 km/s
vulcanism light
tectonics none
climate cool
temperature
average 9 C
dayside 54 C
nightside -84 C
illumination 56 % Earth’s
oceans 40%
composition water
tidal range 0.00 m
atmosphere
main gases N2, O2
traces &c.
class breathable
pressure 0.69 bar
(very thin)
Population & economy
Habitability 5
Resources very poor RVM -2
Affinity 3
carrying capacity 1.2 E+8
Sky Objects
Object size period tides
class (degrees) (hours) (m)
sun: K5 V 0.91 infinite

4 Economy

There is some mineral extraction for local use, and extensive food production.