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statespacedev committed Apr 1, 2024
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7 changes: 7 additions & 0 deletions _config.yml
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title: starid
author:
name: noah smith
email: [email protected]
remote_theme: jekyll/minima
minima:
skin: dark
3 changes: 3 additions & 0 deletions _posts/2024-04-01-april-fools.md
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test post

hi
3 changes: 1 addition & 2 deletions data/readme.md
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nasa skymap sky2000 v5r4 star catalog
-------------------------------------------

nasa skymap sky2000 is the foundation here and it's got some interesting history. back in the day i interacted with some of the people involved and learned a bit. there were roughly two phases of skymap's history - before hubble, and after. nasa still had power in those days, and when it turned out after launch that star catalogs were among hubble's problems, resources were allocated to improve skymap. serious work was done in the 90s to make it the baseline catalog for spacecraft star trackers.

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Tycho-2 (Høg et al. 2000): This catalogue forms the backbone of all the major ground-based catalogues currently available. It was made from a combination of the Tycho star mapper observations on the Hipparcos satellite (Høg et al. 1997), the Astrographic Catalogue, and 143 other ground-based catalogues.

Sky2000 (Myers et al. 2001): The SKYMAP Star Catalogue System is a list of all stars with either measured Johnson blue or visual magnitudes brighter than 9.0. The version used here had 299 167 entries of which 212 were not in the combined Hipparcos + Tycho-2 catalogues. Sky2000 provides positions at J2000, proper motions, and a blue and visual magnitude. We assumed positions errors of 100 mas, proper motions error of 10 mas yr−1, and ASC magnitudes derived from Sky2000 entries to have errors of 0.6.
Sky2000 (Myers et al. 2001): The SKYMAP Star Catalogue System is a list of all stars with either measured Johnson blue or visual magnitudes brighter than 9.0. The version used here had 299167 entries of which 212 were not in the combined Hipparcos + Tycho-2 catalogues. Sky2000 provides positions at J2000, proper motions, and a blue and visual magnitude. We assumed positions errors of 100 mas, proper motions error of 10masyr−1, and ASC magnitudes derived from Sky2000 entries to have errors of 0.6.

UCAC4 (Zacharias et al. 2013): The USNO CCD Astrograph Catalogue version 4 was the most precise all-sky astrometric catalogue (at the time of constructing the catalogue) in the range V=10–16 mag currently available. There are no original standard magnitudes in this catalogue.

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hello world

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<img src="https://github.com/statespacedev/starid/raw/master/docs/images/nouns%20and%20verbs%20level0.png" align="center" width="426" height="202"/>

lo-fi star identification

[background](https://statespacedev.github.io/starid/docs/readme.html) - background notes and photos

[data](https://statespacedev.github.io/starid/data/readme.html) - the full nasa skymap sky2000 v5r4 star catalog

[starid](https://statespacedev.github.io/starid/starid/readme.html) - python oriented code

[libstarid](https://statespacedev.github.io/starid/libstarid/readme.html) - cpp oriented code

20240317 switch back to github from gitlab is looking complete - github was first, 2016 to 2018 - switch to gitlab was about account troubles and comparing capabilities, 2018 to 2024 - switch back to github seems to effectively be about 'going default'. don't feel like thinking about it - go with default. with commit email address updated, and default project website activated, looks like 'third era' is rolling from today.

20240310 learned a lesson about working on windows laptop - especially for cpp. tracing back over the years, this cpp code has mostly been used on ubuntu. there was a bit of macos thrown in there along the way, involuntarily, but using gcc and things were 'close enough' to ubuntu that the impact was minimal. yesterday, for the first time was really working on cpp code on windows - and got bitten powerfully. windows clion defaults to mingw tools, 'minimal gnu for windows'. build and debug work deceptively well - enough so that the picture gradually builds up that everything's fine. huge mistake. was deep into creating and debugging some relatively intense code. suddenly got an error. this was especially uncool as had been cleaning up to finish for the day and the last change was a trivial nothing. basically, couldn't believe what was happening, so hammered on it for a while getting more and more frustrated. did seem like a solid error had appeared 'from nowhere' - could detect some slight variation of the particular error, again for seemingly no reason, but was wondering 'what is wrong with windows' - had to just drop it and go for a long walk.
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