Constants/ Equations Flashcards
1
Q
1 pc
A
3 ly
2
Q
1 ly
A
10^13 km
3
Q
1 AU
A
150 x 10^6 km
4
Q
rSun
A
7 x10^5 km
5
Q
rEarth
A
6400 km
6
Q
c
A
3x10^8 m/s
7
Q
lambdaMax
A
3x10^6 / T (nm)
8
Q
Gyr
A
13.8 Billion yrs
9
Q
Fgravity
A
Gm1m2/ D^2
10
Q
Kepler 3rd law
A
P^2 = R^3
11
Q
Newton Version Kepler 3rd law
A
A^3 = (M1+M2)P^2
12
Q
Resolvable angle
A
1.22 lambda/ d
13
Q
Escape velocity
A
Sqrt(2GM/R)
14
Q
Orbital velocity
A
Sqrt(GM/R)
15
Q
M = (for period relation)
A
4pi^2 r^3 / GT^2
16
Q
Average radius of asteroid belt
A
3 AU
17
Q
Outer radius of Kuiper Belt
A
50 AU
18
Q
Radius of Oort Cloud
A
50,000 AU
19
Q
5 dwarf planets
A
Eris, Pluto, Ceres, Makemake, Haumea
20
Q
Brightness
A
B = L/4piD^2
21
Q
Angular shift
A
P = 1/D (arcsecs & parsecs)
22
Q
Luminosity
A
L prop to R^2T^4
23
Q
Schwartzchild radius
A
Rs = 2GM/c^2
24
Q
Sum comp
A
73% H, 25% He, 2% heavier
25
Surface sun temp
5780 K
26
Sun radius (to earth’s)
110 Rearth
27
Lifetime of sun on main sequence
10 Gyr
28
Parsec
3.26 ly
29
Hubble’s law
V = HoD, Ho = 70 km/s/Mpc
30
Redshift
Z = del lambda/ lambda = v/c
31
SMBH radius
R = deltaT*c
32
Life of Universe equation
T = 1/Ho
33
Expansion rate
R = lambda current/ lambda decoupling
34
Sun to galaxy center distance
8 kpc
35
Radius of Milky Way
15 kpc
36
Age of Universe
13.8 Gyr
37
Composition of Universe
70% dark energy, 25% dark matter, 5% ordinary matter
