Arbuthnot system (Psi Ursæ Majoris)

RogerBW

1 Interstellar navigation

Also designated: ψ Ursae Majoris, ψ UMa, Psi UMa, 52 Ursae Majoris, BD+45 1897, FK5 420, GC 15340, HD 96833, HIP 54539, HR 4335, PPM 52277, SAO 43629.
Destination θ ϕ ρ K
HIP:53523 (Pilyugin) K1. V (Novaya Europa) 324 40 4.7 465
HIP:53756 (Leeuw) K4V (United Kingdom) 30 -61 3.8 519
HIP:56145 (Berezniak) K1III (Novaya Europa) 5 11 9 335
HR 4285 (Fletcher) F9V (United Kingdom) 347 -9 10 319
To HIP:53523 (Pilyugin) HIP:53756 (Leeuw) HIP:56145 (Berezniak) HR 4285 (Fletcher)
From θ ϕ ρ θ ϕ ρ θ ϕ ρ θ ϕ ρ
HIP:53523 (Pilyugin) 7 -62 7.2 15 -5 12 358 -35 8..2
HIP:53756 (Leeuw) 294 62 7.2 17 30 10 338 11 8.8
HIP:56145 (Berezniak) 301 5 5 304 -30 10 321 -11 17
HR 4285 (Fletcher) 72 35 52 52 -11 8.8 34 11 17

2 System map

ID # orbit world type size/e mass/e g/e atmosphere hydrographics temp climate day HI RVM Affinity
(a.u.) (10 Mm) (C) (hours)
I 0.91 tiny rock planet 0.51 0.11 0.41 none 753 infernal 24.0 0 0 0
1 moonlet 753 infernal 0 0 0
II 1.3 small rock planet 1.1 0.81 0.74 none 585 infernal 16.7 -1 0 -1
2.0 asteroid belt 413 infernal 0 1 1
3.8 jump point Leeuw
4.7 jump point Pilyugin
III 6.6 medium gas giant 12 500 3.5 superdense corrosive 11.2
10 moonlets 108 infernal 0 0 0
IIIa 122 small rock moon 0.64 0.18 0.45 none 105 infernal 168 -1 0 -1
IIIb 143 tiny rock moon 0.31 0.02 0.25 none 108 infernal 213 -1 -1 -2
IIIc 171 tiny rock moon 0.36 0.03 0.22 none 108 infernal 277 0 -2 -2
IIId 196 small rock moon 0.55 0.13 0.44 none 105 infernal 340 -1 0 -1
5 moonlets 108 infernal 0 -2 -2
9 jump point Berezniak
10 jump point Fletcher
IV 16 medium gas giant 8.2 100 1.5 superdense corrosive 174
8 moonlets -28 very cold 0 -1 -1
IVa 73 standard ocean moon 0.68 0.28 0.61 thin suffocating 90% water -15 cold 174 -2 1 -1
IVb 84 small rock moon 0.50 0.09 0.35 none -31 frozen 213 -1 0 -1
IVc 94 tiny rock moon 0.30 0.02 0.21 none -28 very cold 254 -1 -1 -2
IVd 108 small rock moon 0.56 0.12 0.39 none -31 frozen 309 -1 1 0
IVe 123 tiny rock moon 0.30 0.02 0.21 none -28 very cold 378 0 -1 -1
1 moonlet -28 very cold 0 0 0
35 asteroid belt -108 frozen 0 1 1
57 asteroid belt -143 frozen 0 2 2
V 96 medium gas giant 11 300 2.6 superdense corrosive 25.6
8 moonlets -173 frozen 0 0 0
Va 96 small ice moon 0.39 0.03 0.19 very dense mildly toxic 70% hydrocarbons -163 frozen 151 -1 -1 -2
Vb 110 tiny ice moon 0.16 0.00 0.06 none -185 frozen 184 0 -1 -1
Vc 125 small ice moon 0.42 0.03 0.17 very dense mildly toxic 70% hydrocarbons -164 frozen 225 -1 2 1
Vd 143 tiny ice moon 0.26 0.01 0.10 none -185 frozen 274 0 1 1
Ve 164 tiny ice moon 0.26 0.01 0.10 none -185 frozen 334 0 0 0
4 moonlets -173 frozen 0 1 1

3 Habitation

British colony founded 2353.
A gas giant lies at the outer edge of the habitable zone (16AU, with a 36-year eccentric orbit covering 11-21AU); a tidally-locked water/ice moon of that is livable with air masks (cold thin nitrogen and carbon dioxide atmosphere) and is gradually being made human-habitable, but there’s also a fair bit of space industry.

3.1 Planetology

class of star A5 V
mean distance 16 a.u.
perihelion 11 a.u.
aphelion 21 a.u.
axial tilt
annual period 35.6 years
1791.3 local days
local day 174.0 hours
orbital period 7.24 std. days
standard ocean moon
diameter 0.68 x Earth’s
8653 km
density 0.90 x Earth’s
5.0 g/cm^3
surface gravity 0.61 g.
6.0 m/s^2
escape velocity 7.2 km/s
vulcanism heavy
tectonics heavy
climate cold
temperature
average -15 C
perihelion 34 C
aphelion -46 C
illumination 69 % Earth’s
oceans 90%
composition water
tidal range 0.00 m
atmosphere
main gases N2, CO2
traces &c.
class suffocating
pressure 0.61 bar
(thin)

3.2 Sky objects

object apparent: size period tides
class (degrees) (hours) (m)
sun: A5 V 0.22 174.0 0.00
IV: medium gas giant 8.2 fixed

4 Economy

There are many antimatter refineries in the inner system, most of them orbiting to match the Leeuw jump point.
There is relatively little traffic to the Berezniak and Fletcher jump points.