Orbit parameters transformation

General physics and astronomy discussions not directly related to Celestia
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ajtribick
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Orbit parameters transformation

Post #1by ajtribick » 29.05.2004, 16:33

I'm trying to create a .ssc file for the planets of PSR B1257+12, using the information given at http://www.obspm.fr/encycl/1257+12.html, however I think these are given in the plane of the sky rather than the ecliptic, how do I convert these to ecliptic plane parameters?

Also for PSR B1620-26.

One further thing, what is a typical visual magnitude for a pulsar (outside the beam area)?

granthutchison
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Post #2by granthutchison » 29.05.2004, 17:04

I've written an Excel spreadsheet for the orbit conversion. Get it here:
http://www.lns.cornell.edu/~seb/celestia/hutchison/spreadsheets.html#3

Grant

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Post #3by norm.shaw » 29.05.2004, 19:03

Grant... I'd just like to say thanks a lot for your spreadsheet "Panorama positioning: panorama.xls". I've been trying to position a shuttle launching from Kennedy - pulling my hair out trying to figure out the correct input. With your calculations, I was able to place it just where I wanted. :-)

Image

Thanks again!

-Norm

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Post #4by ajtribick » 29.05.2004, 21:28

Thanks for that, now I just have to convert the T_peri to standard calendar, only problem is that I'm not sure how to do that.

Mainly because its given in MJD, and I am fairly certain that MJD does not stand for mega-Julian Days because that gives really stupid results. At least with this converter.

granthutchison
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Post #5by granthutchison » 29.05.2004, 21:32

MJD (modified Julian days) = Julian days - 2400000.5

Grant

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Post #6by ajtribick » 29.05.2004, 21:34

Thanks :)

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Post #7by granthutchison » 29.05.2004, 21:35

norm.shaw wrote:Thanks again!
Thanks for the thanks. Sometimes I wonder if anyone ever downloads these things.

Grant

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Re: Orbit parameters transformation

Post #8by granthutchison » 29.05.2004, 21:50

chaos syndrome wrote:One further thing, what is a typical visual magnitude for a pulsar (outside the beam area)?
Ah, I knew I'd worked this out already, to give a neutron star with a 10km radius: here it is.

Grant


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