How to get Sector and Vector Coords of star?

[CMDR ARGHouse]

Hi, been doing some research into how pioneer handles sectors and placing of stars and I'm still stumped by how sector and vector co-ordinates are calculated?

For example. Castor in the bright stars file is:
(5,2,3,v(0.012,0.194,0.404))

while out of pioneer, it's RA is 07h 34m 35.863s, DEC is +31° 53′ 17.79″ and is about 51 LY away from Sol. I'm am wondering how Sector and Vector Coordinates are calculated from astrometric data?

[bszlrd]

The numbers between the parenthesis are subcoordinates let's say, where they lie inside the sector. Sectors are 8*8*8 ly cubes.
I once figured out how to convert RA coordinates to our cartesian coordinates, but I have to dig that up.

[bszlrd]

I just found this, it might be useful: Coordinate converter

[CMDR ARGHouse]

https://astronomy.stackexchange.com/que ... h-distance
I found something, I've just got to brush off my trig knowledge.

[sturnclaw]

So, I'm not the person who originally set the coordinates of the stars, but here are a few fundamental points about our coordinate system:

- Sol (0, 0, 0) is the center of the coordinate system.
- The density of the galactic plane varies uniformly with respect to abs(sector.Z), indicating that the Z axis is defined as normal to the galactic plane.
- Sagittarius A* is located at (-3125, 0, 0), so the X axis of the coordinate system is directly aligned with the exact galactic center.

Therefore, I can at least semi-confidently say that our galaxy is addressed with a coordinate system exactly like so:


Sol is at sector coordinate (0, 0, 0), with the negative X axis of the sector coordinate system pointed towards 0 degrees in that image and the positive Y axis of the coordinate system pointed towards 90 degrees. Converting from Right Ascension+Declination to Galactic Cartesian Coordinates is accomplished by following https://en.wikipedia.org/wiki/Galactic_ ... oordinates to get 'l' and 'b', then with the link you posted to convert spherical coordinates into Cartesian.

Be wary to make sure the galactic longitude of 0 gives you a cartesian coordinate in the negative X direction, as we don't follow the "standard" axis convention for galactic *or* spherical coordinates.

[Gliese852]

I would like to point out a couple of things:
1. In Pioneer, there is no translation from the equatorial coordinate system to the galactic one, all custom systems, except for the Sagittarius A*, are inserted into the galaxy directly in the equatorial one. (see viewtopic.php?f=3&t=302&start=20)
2. Translation from one spherical coordinate system to another is always a pain. Therefore, if you need Cartesian coordinates at the end, convert the coordinates to Cartesian first. Then you can easily translate them into any coordinate system by simply multiplying by the correct matrix.

[pld]

I have an additional question today.
how is the vector of a ship from hyperspace calculated when entering a star system? ...

[pld]

...and so, I mean it's flat space
(coordinate stars)
the solution is a random vector of the ship and.
ecliptic planes must be randomly generated or specified in a file, etc.

It is obvious