Re: [guide-user] UCAC4 permanently in Guide

Denis Oct 9 2:27 PM

Thanks Bill,

I have these codes. I translated the ucac3 to Delphi and its works very

One thing I have done is written a little program which take the present
A2 files and filters them by mag, ie. 16 to 20 mag data only.

I used to have an A20.index in text mode not bin but somehow can't find
it anymore. I notice that when you delete the A20.idx in Guide 9 it
re-creates itself. What I would like to do is use my A2 set of files in
Guide 9 but need to replace the A20.idx to match my new files.

I vaguely remember how to produce one but it would easier and quicker if
I had the codes. Thinking clearly, I could simply extract the data in a
text file which is quite easy to do.


On 09/10/2012 9:46 AM, Bill J Gray wrote:
> Hi Denis,
>> Are you planning to take the UCAC4 permanently into Guide 9? With all
>> the improvements, it would be worth to create the a new Guide 9 set of
>> files as you did for UCAC3. The best way would be to create codes to
>> convert UCAC4 to Guide 9 format and use the resulting files to replace
>> the UCAC3 360 files.
> I expect to do that at some point. First step has been to get Guide
> to show UCAC4 from the original disks. This serves several purposes,
> one of which is that anybody (including Guide 8 users) can get UCAC4
> displaying as soon as they have the UCAC4 disks.
> Another advantage: in order to get UCAC3 to fit on the Guide 9 DVD,
> I had to compress it, and the compression was not lossless. I reduced
> the precision (usually to a point well within the error levels of the data)
> and threw out some internal flags and similar "less important" data.
> I'll have to do the same sort of things with UCAC4. If you run from the
> raw data, you get absolutely everything. (If you look at "more info"
> for UCAC4, you'll see that there is quite a lot of data: three infrared
> magnitudes from 2MASS, two magnitudes from UCAC4 itself, and -- for a
> lot of brighter stars -- five APASS magnitudes. Be warned that these last
> are not to be trusted to the degree their errors indicate, though.)
>> If I had the codes I would give it a try. Are the codes to access the
>> reformatted ucac3 in guide 9 available?
> I haven't gotten those posted yet (I have a _lot_ of code that needs
> to be posted... it also needs to be commented and cleaned up to the point
> where it won't drive anyone too crazy). I _do_ have C code posted for
> accessing the raw UCAC4, 3, and 2 data, at
> This code should be quite readable and, I hope, useful to any C or
> C++ programmers out there.
> -- Bill
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