Project Cyclops, A Design... - Department of Earth and Planetary ...

PLANETARY
Planet
ORBITS
Semimajor Sidereal Orbital Inclination
Axis (AU) Period (yr) Velocity (km/s) Eccentricity to Ecliptic
Mercury 0.387 0.241 47.9
Venus 0.723 0.615 35.05
Earth 1.0 1.0 29.8
Mars 1.524 1.88 24.14
Jupiter 5.203 11.86 13.06
Saturn 9.54 29.46 9.65
Uranus 19.18 84.01 6.08
Neptune 30.07 164.8 5.43
Pluto 39.44 248.4 4.74
0.2056 7°0'11"
0.0068 3023'37 ''
0.0167
0.0933 1°51'1"
0.0483 1° 18'31"
0.0559 2029'33 ''
0.0471 0°46'21"
0.0085 1°46'45 ''
0.2494 17° 10'
STAR DENSITIES IN THE SOLAR NEIGHBORHOOD
Giants and Supergiants Main Sequence
Class Number/pc 3 Percent Number/pc 3 Percent
O 2.5× 10-8 0.00003
B IX10 --4 0.13
A 0.07 5X 104 0.66
F 5X 10 --5 0.07 2.5X 10-3 3.3
G 1.6X 10--_ 0.21 6.3× 10-3 8.3
K 4X 10-4 0.52 1X 10 -2 13.1
M 3X 10-s 0.04 5X 10 -2 65.6
White Dwarfs
Number/pc 3 Percent
1.26X 10-3 1.6
2X 10-3 2.6
1.26X 10-_ ! .6
6.3X 10--4 0.8
IXIO -3 1.3
Total 6.4X 10-'_ 0.84 7X 10-2 91. 6.1X 10-3 8.0
Total F, G, K Main Sequence 1.9X 10-7 25.
NOTE:
Individual values are accurate to ±10%, at best. Percentages do not add exactly because of rounding errors.
GALAXY
Diameter of disk _ 30 kpc = 100,000 LY
Thickness at center -_ 4kpc = 13,000LY
Total mass = 1.1X10tt M o
Absolute magnitude (as seen
from outside Galaxy, normal
to disk)
-20.5
Sun's distance from galactic
center = 30,000 LY
Sun's distance from galactic
plane = 26 +-40 LY (north)
Rotational velocity in solar
neighborhood
Rotational period at solar
neighborhood
2 ! 5 km/s
236X 106 years
Luminosity (same direction)
Density limit of all matter in
solar neighborhood (Oort
limit)
Density due to stars in solar
neighborhood
1.3X 1010 Lo
= 0.14 Mo/PC3
0.057 Mo/PC 3
Age of galaxy
12X 109 years
Total number
of stars
5X 101 i
175