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Do you own an old 486 computer or one made in the early 90s? I have old nasa orbital data trapped in a executable file that was complied by them in the early 90s on old computers. It wont run on modern computers. It runs on DOS. It wont work with DOS running in Virtual box or even a new modern...

Can someone tell me how I can find the X velocity coordinate, Y velocity coordinate, and Z velocity coordinates if I am given the velocity? I believe I am looking for the Vx Vy Vz shown in this picture. https://en.wikipedia.org/wiki/Orbital_state_vectors#/media/File:Orbital_state_vectors.png The...

hello, I have these 3 dates and I know the position X Y Z of moon Amalthea relative to Jupiter and then I know the Velocity Vectors V for each one. I need to get the VX VY VZ components for each of the 3 date-times. Do I have enough information to get those from what you see? I believe I need...

just learning hyperbolic orbits. Can some expert explain what f means in this formula? I know eliptical orbits math but dont understand where f comes from with hyperbolic orbits. See image

What is difference between "A1Gregorian" and just "Gregorian" to describe an epoch? What is difference between "A1Gregorian" and just "Gregorian" to describe an epoch? or A1ModJulian verses UTCModJulian? never heard of "A1" before thanks

Hello, Lets say I have a partial orbit curve in space. I know how to construct the curve. I have, for example, 500 X Y Z coordinates for the points that make up the orbit curve so its pretty smooth. Those X Y Z coordinates are referenced to the planet with x axis pointing in the direction of the...

any serious users out there of Aladin 9.3 ? http://aladin.u-strasbg.fr/aladin.gml I was looking for a user or forum of users to converse with who have made their own HiPS thanks

Anybody know of a public resource available that tells the burn times for thrusters for different unmanned space missions past or present? example would be the date and time a thruster fires for spacecraft to slow to enter an orbit around a planet. thank you

Hello I have this 3 x 3 matrix. I am just learning them and I get confused. Please pardon the verticle line placement. I gets out of wack. | cos(theta) 0 -sin(theta) | | 0 1 0 | | sin(theta) 0 cos(theta) | and then I have this...

hello, when calculating the correction "Equation of Equinoxes" refered to as "eqeq" where ΔΨ is the Nuations in Longitude the formula is eqeq = ΔΨ * cos(e) Is "e" in this formula the "mean" obliquity of ecliptic(E0) or "true" obliquity of ecliptic ? or can you use either to find eqeq...

what is the difference between "apparent" azimuth and elevation? and non apparent azimuth and elevation? Is there such a difference and how do I convert between them? Since your location on a planet can either be in planetcentric lat long coordinates or planetographic lat long coordinates i...

Hello Can someone explain to me the math behind converting planetographic coordinates to planetocentric coordinates and vise versa? The best info i found is on this link ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/spicelib/plnsns.html but it is incomplete and I dont know fortran. I...

deleteme

Does anyone know the way to convert heliocentric Latitide and heliocentric longitude like those outputed from vsop87 for any particular planet into planetocentric solar coordinates? I was hoping to find the math formulas for doing that with various planets. Any assistance would be helpful.

Hello at this link http://www.giss.nasa.gov/tools/mars24/help/algorithm.html step B-3 they talk of Determining the Perturbers ----------------------------------------------------------------- B-3. Determine perturbers. (AM2000, eq. 18) PBS = Σ(i=1,7) Ai cos [ (0.985626° ΔtJ2000 / τi) + φi]...

hello, I would like to get the "Mean Anomaly at Epoch" J2000 for Venus but confused by something this link https://in-the-sky.org/data/object.php?id=Venus says "mean anomaly at epoch" venus is -64.56 https://en.wikipedia.org/wiki/Venus says "mean anomaly" is 50.115 deg Could someone explain...

there may be no bright north star for mars but anyone know what celestial sphere coordinates on the celestial sphere it would be if there was a perfectly positioned north star for mars? If there was a perfectly positioned north star for earth that would be easy since celestial sphere was...

Hello, I could use some help. I get confused when trying to integrate milliseconds and leap seconds into my conversions. Using formula which i believe is correct. UT1 = UTC + DUT1 convert UTC date that looks like this 2003-05-23T09:34:12:348z (UTC) and using chart found here...

Looking at this diagram found here: http://www.nakedeyeplanets.com/mars-seasons.htm I would like to find out the angle between the Mars WS (winter solstice) location shown and the vernal point (0 deg) which is also shown between Pisces and Aquarius in the diagram. does anyone know how to find...

Does anyone know how to get Ls values for Mars using true anomaly angle values? any formulas anyone knows of? seems like there might be a realtionship between the two -Ls and True anomaliy angles- but not exactly sure. I am entering new learning territory. my assumptions at this point which may...