Thread: Stellar Mapping
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Old 08-21-2018, 06:02 PM   #10
Agemegos's Avatar
Join Date: May 2005
Location: Oz
Default Re: Stellar Mapping

Originally Posted by acrosome View Post
Should I just use Hipparcos (or Gliese? which is better?) and add in all those dwarfs from CTIOPI?

EDIT-- Dammit. Hipparcos doesn't list the stellar class...
To amplify on a previous answer, I recommend that you start with the Extended Hipparcos compilation. Published in 2012, it consists of quality controlled position data from Hipparcos that has been carefully compiled with basically all the other data available in other catalogues.

XHIP has spectral classes and luminosities associated with Hipparcos position data. Also distance pre-calculated. Cartesian co-ordinates pre-calculated. Stellar ages where known. Metallicity where known. Star names. What constellation the star is in.

It also has a huge trove of stuff that you aren't interested in right now. Proper motions. Radial velocities. Space velocities in Cartesian co-ordinates. Elements of the star's orbit around the centre of the Galaxy. Number of known exoplanets. Type and range of variability.

I don't know why you might be having trouble, but if I navigate to I can go to the "Preferences" pane in the column on the left, click on the drop-down menu next to "max:" where it says "50" and select "unlimited". Then in the drop-down menu where it says "HTML table" I click and select "tab-separated variables" or whatever. And under "Position in:" I click the radio button for "decimal". Then I go to the main body of the text and check the data I want included in my report in the square check-boxes. Distance is "Dist" in the second group of data. I click the round "sort" radio button to get the output sorted in distance from Sol. And in the "constraint" column next to "Dist" I put "0..13.3" to get only results within 13.3 pc (43.36 LY). Then click any of the "submit" buttons and the results are downloaded to my Downloads folder as a tab-separated-variables file called "asu.tsv".

It works for me, but the results are too much to include in a post here. I put a results file on DropBox in case that is useful.

I think you are going to have to add new discoveries since 2012 by hand to something — easier than adding luminosity and spectral type to any existing positional catalogue. And given that, I think an extract from XHIP is the best catalogue to add to.

Decay is inherent in all composite things.
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