Serpens Solidus

No one posted this yet?

Cool, but I don't feel like covering my room in photographic paper

When the roller blinds in my room are almost closed, magical horizontal lines appear on the wall. I realized that those lines correspond to the horizontal features of the neighbor's house. This inspired me to convert my room to a camera obscura. For a long time, I was too lazy to actually do it. But I got bored yesterday, so I decided to put the idea to the test. I improvised a pinhole using stuff lying around: The result was pretty cool: Here is an enhanced image for your viewing pleasure: It is quite fun to see people walk by upside down on the wall

Hmm... where have I seen this before? Second stage recovery was part of the original plan afaik. Musk on the upper stage: https://youtu.be/PULkWGHeIQQ?t=6m59s

What happened to spacexstats.com? EDIT Oh nvm, it's http://spacexstats.xyz/ now.

nah, they have done a t +0 abort

noooooo

WOOHOOOO

The demonstration used during the lecture has just been uploaded to youtube. It's in Dutch though.

2nd year applied physics.

So I had a lecture on two body problems this morning, and then this happened:

Don't forget that all this started when some moderator decided is was a good idea to merge all SpaceX related threads into one. *hides under table*

Yeah, I am also kinda getting tired of scrolling through pages and pages full of off topic text every day, just to be sure not to miss anything SpaceX related.

About the gravity issues: Problem solved.

I recently found out that the normal marker in target mode is aligned with the orientation of the target docking port, which makes things much easier. I'm not entirely sure that's true, but I'm to lazy to check it myself.

A 10% increase in lifetime cancer risk is not quite a 10% chance of dying. Unless we're talking about percentage points.

Instead of empirically determining the new values, let's calculate them. (I use MATLAB for convenience) We have this KSP now uses 9.80665 and 6.67408e-11 instead of 9.81 and 6.674e-11 for gravity equations. and this KSP calculates body mass by taking the gravity in gees at sea level (times g0) and the radius and back-calculating using G (big G). Since both g0 and G have changed, mass for all bodies will have changed slightly. We first calculate the new Kerbin year using the in game values g0 = 9.80665; gKer = 1 * g0; RKer = 600000; gSun = 1.74625 * g0; RSun = 261600000; SMA = 13599840256; year = 2 * pi * sqrt(SMA^3 / gSun / RSun^2) year = 9205116.55936357 Which is 30ish minutes (!) longer than the old year of 9 203 490 s. (according to the wiki) Using the old sidereal day (also from the wiki), we get the length of a solar day dsi = 21549.425; dso = year * dsi / (year - dsi) dso = 21599.9911592099 Which is 8ish milliseconds shorter than the old value of 21 600 s, about 4e-7 of a day. So after a million days, the sun should be about 40% of a day ahead of the actual time. To test this, I started a new game and clicked "warp to next morning". The time was 4:33. Then I made a quicksave, and set the UT to 21 600 000 000. Loaded the quicksave again, warp to next morning. The time is 4:33 again, but the position of the sun in the sky hasn't changed at all. There isn't even a visible change in the shadows of the KSC. Apparently Kerbin's solar day is still exactly 21600 seconds. (gj Squad) This gives the new sidereal day, which is also the period of a KEO newdsi = year * 21600 / (year + 21600) newdsi = 21549.4337994455 Now we can calculate the SMA of a KEO KEOSMA = (gKer * RKer^2 * newdsi^2 / 4 / pi^2)^(1/3) KEOSMA = 3462940.70836292 Both values match your empirically determined values, which suggests that my calculations are correct (which is always a good thing). @NathanKell I have one question: Why does KSP use G in gravity calculations? When doing gravity calculations, you always use the standard gravitational parameter (G*Mass), which is equal to gsurface * radius2. So you don't really need G (or body mass).

I does need to be squared https://en.wikipedia.org/wiki/Orbital_period#Small_body_orbiting_a_central_body