Cosmic Train Schedule
Schedule of Launch Windows
for Hohmann Transfer Orbits
These schedules were made from a Microsoft Excel spreadsheet
The spreadsheet includes Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune
Also included are trip times, delta V from user specified parking orbits,
and altitudes of possible parking orbits such as GEO, EML1 for the earth,
altitudes of Mars moons Phobos and Deimos, altitudes of larger Jupiter moons, etc..
L1 and L2 distances
A spreadsheet giving sun-planet L1 and L2 distances for various planets
as well as planet-moon L1 and L2 distances for various moons.
New Cartoon Delta V Map with an emphasis on EML1 and EML2.
Catching an Asteroid parking a rock at EML2 can take surprisingly little delta V.
What the Heck is Vinf? A look a hyperbolas.
The Dark Side of the Moon
- Nothing weighty, just having some fun.
Mini Solar Systems
- A science fiction setting allowing fast paced stories and
Deboning the Porkchop Plot
- Plane change expense can be exaggerated by Lambert iterations.
Murphy's Mangled Math
- A critique of Tom Murphy's arguments against space resources.
Puppets, Telerobots and James Cameron
- Use of remotely operated devices (aka avatars) in space.
The Next Continent
- Book review and a call for more hard SF set in our own solar system.
Inflated Delta Vs
- Delta Vs from one planet to another are often exaggerated.
Mf is a Mofo
- An article on Mass Fraction and Tsiolkovsky's Rocket Equation.
Beanstalks, Elevators and Clarke Towers
- An article on space elevators.
Near Earth Asteroid Delta V by Shoemaker and Helin
Earth-Approaching Asteroids As Targets For Exploration
This 1978 paper by Shoemaker and Helin is often cited on pages about delta V to near earth asteroids.
For years I searched for this document on the internet.
Finally I went to the Arizona State University and copied it from microfisch.
Folks at NASA told me it's okay that I transcribed and uploaded the pdf.
Tangent Ellipse Transfer Orbits
A spreadsheet for launch windows to elliptical orbits. (This one is for Mars)
A nice discovery I made in the Mars spreadsheet: A 2018 Mars trip that takes 214 days.
Asteroid launch windows can be found by inputting orbital elements into rows 2 and 3.
For asteroid 2009 OW6, it looks like there was an August, 2009 trip that took 30 days.
This spreadsheet won't work well for orbits having a healthy inclination.
The spreadsheet also assumes a perihelion greater than 1 A.U.
explains the math behind the tangent ellipse spreadsheet.
Other space stuff by Hop David:
Shotgun Orbital Simulators
Delta Vee Map
A whimsicly illustrated delta vee map to some near earth destinations.
The Case For Asteroids
A way to retrieve asteroidal resources with unmanned spacecraft.
Hop's Art Gallery
Please check out my painting and drawings.
Hop's Deviant Art Gallery