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Details

AERO 451
Spacecraft Dynamics 1
15
Aerospace Engineering
Undergraduate 3
06/04/2011

Additional Aerospace Engineering Flashcards

 


 

Cards

Term
Equinox
Definition

Twice per year

-Equitorial and Orbital plane meet

March 20/21 - Spring Equinox

Sept 22/23 - Fall Equinox

 

Term
Solstice
Definition

Twice per year

Equitorial and Orbital plan are furthest away

June 20/21 - Summer Solstice

Dec 22/23 - Winter Solstice

Term
First Point of Aries
Definition

Defined as the position of the sun @ the time of Vernal Equinox

 

Named for constellation where sun was when it occured

Term
Mean Solar Time
Definition

Kept by clocks

 

Assumes a circular orbit

Term
Sidereal Time
Definition

Time for the sun to return to the same spot overhead

 

23 hours and 56 minutes

Term
Kepler's Laws
Definition
  1. Planets orbit in ellipses with sun @ 1 focus
  2. Law of Areas
    • Equal area in equal time
      • If A1=A2=A3
      • Then T1=T2=T3
  3. P2 α a3 - Square of Period is proportional to cube of mean distance from sun.

 

Term
Periapse
Definition

When m is closest to M

 

Velocity is greatest

Term
Apoapse
Definition

When m is furthest from M

 

Velocity is the smallest

Term
Newtons Law of Gravitation
Definition

Force =

 

 

Gm1m2


r2

 

G=6.6742 x 10-11

Term
Flight Path Angle
Definition
Angle between the normal to position vector and the velocity vector
Term

Coordinate Systems

ECI

Definition

Earth Centered Inertial

 

Fixed Vernal Equinox

Term

Coordinate Systems

GCRF

Definition
Geocentric Celestial Reference Frame
Term

Coordinate Systems

ECEF

Definition
Earch Centered Earth Fixed
Term

Coordinate Systems

Perifocal Frame

Definition

Most Common

Earth Centered Orbit Based Inertial

S/C fixed - rotating

 

Not for circular orbits

PQW unit vectors. P points towards perigee

Term
Rules for HT vs. Bi-elliptical
Definition

If outer target is <11.9x inner, H.T is better

If outer target is >15x inner, Bi-elliptical  is better

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