Schedule of Launch Windows
for Hohmann Transfer Orbits
| Departing from Mercury for ---------- Venus Earth Mars Jupiter |
Departing from Venus for Mercury ---------- Earth Mars Jupiter |
Departing from Earth for Mercury Venus ---------- Mars Jupiter |
Departing from Mars for Mercury Venus Earth ---------- Jupiter |
Departing from Jupiter for Mercury Venus Earth Mars ---------- |
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These schedules were made from a Microsoft Excel spreadsheet
Hohmann.xls
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..
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| This coloring book looks at conic sections, Kepler's laws, the Oberth Effect, Hohmann Transfers, Tsiolkovsky's rocket equation and other stuff related to going to space. Coloring book is $2 plus shipping and handling. I am not pleased with the page thickness in this book. A coloring book should have opaque pages so the image on the other side doesn't show through. Therefore I am making an effort to send a digitial PDF copy to those who order this book. |
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L1 and L2 distances
L1-2_distances.xls
A spreadsheet giving sun-planet L1 and L2 distances for various planets
as well as planet-moon L1 and L2 distances for various moons.
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Hop's Blog
Fact Checking Neil deGrasse Tyson He's known for fact checking pop media stuff. I fact check him.
A New Tether Spreadsheet A tool for looking at how massive tethers need to be.
Phobos Panama Canal of the Solar System Looks at elevators from Phobos
Orbital Momentum as Commodity Uses for mass high in earth's gravity well
EML2 Earth-Moon L2 is an interesting region
Have your Ion ISP and eat Oberth cake too. Tethers can build up and store orbital momentum
The Need for a Better Alpha A low mass power source would open doors
Potholes on the Interplanetary Superhighway Pop wisdom exaggerates the benefits of the ITN
A Spiral of Tethers a way to move stuff in and out of earth's gravity well
Reusable Earth Departure Stage would be made possible by a propellent source near EML2
Travel on Airless Worlds Minimum energy suborbital hops from point A to B
Terraforming Mars vs Orbital Habs a rant against planetary chauvinism
Who needs humans? Humans plus robots are a better combo than robots alone.
What's Minimum Spin Hab? Are mammoth Stanford Tori or O'Neill Cylinders needed?
What about Mr. Oberth? Comparing departure from LEO to departure from higher orbits
One Legged Stools A rant against Mars Firsters, Moon Firsters as well as NEO Firsters
Lunar Ice vs NEO Ice Two possible sources of extraterrestrial propellent
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 at 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 plausible engineering.
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.
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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.
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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.
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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.
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Caveat: This spreadsheet won't work well for orbits having a healthy inclination.
The spreadsheet also assumes a perihelion greater than 1 A.U.
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This pdf explains the math behind the tangent ellipse spreadsheet.
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Other space stuff by Hop David:
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Shotgun Orbital Simulators
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Delta Vee Map
A whimsicly illustrated delta vee map to some near earth destinations.
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The Case For Asteroids
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Kuck Mosquitoes
A way to retrieve asteroidal resources with unmanned spacecraft.
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Hop's Art Gallery
Please check out my painting and drawings.
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Hop's Deviant Art Gallery
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