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sot / chandra_aca

Chandra Aspect Camera Tools
https://sot.github.io/chandra_aca
BSD 2-Clause "Simplified" License
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Add zero offset aimpoint table to ska data #125

Closed jeanconn closed 1 year ago

jeanconn commented 2 years ago

Can we just add the zero offset aimpoint table to ska data?

chandra_aca.drift.get_default_zero_offset_table could then try local disk, then icxc, then ska data.

It is annoying to need to be on head or on vpn to get the table.

taldcroft commented 2 years ago

What's the use case? For approved products I'd go straight to the FOT MP approved_loads area.

jeanconn commented 2 years ago

I don't understand your approved loads use case. My use case is sparkles.yoshi to start which now has hard-coded aimpoints for convenience that I fear I'll forget to update.

taldcroft commented 2 years ago

You can get the zero offset aimpoint for an obsid from the ORlist for approved loads. But I now see the issue.

What about a cron job that copies the current /data/mpcrit1 file once a day and makes it accessible at https://cxc.cfa.harvard.edu/mta/ASPECT/drift/zero_offset_aimpoints.txt. I don't think those numbers are sensitive and so they can be on a public server. That way we don't need to add yet another Ska data that needs to be synced.

jeanconn commented 2 years ago

Sure, a public web copy would also work. Would that need a chandra_aca task schedule or just an entry in the cron task wiki and a comment in chandra_aca?

taldcroft commented 2 years ago

Isolated cron task doing an rsync and a comment in the code would be fine. Probably once a week is actually plenty, considering the current change frequency.