Re: processing TR01 to TR34

[droege@snapmail.us]

Fraser and all,

Beware that collect_stars does not do a great job.  You will find lots of
"split" stars.  I have another program that I run through a few times to
reduce the number of split stars.  Someone out there may want to do this
right.

Tom Droege

> To all,
>
> During my spare moments I've been doing some processing of the ~1000
> *.cal files from batches TR01 to TR34; which I downloaded last month.
> These cover the whole northern sky as well as the traditional TASS
> equatorial band. Here's a few statistics so far:
>
>  - Decompressed total size of *.cal files :  15 355 904 130 bytes (ie:
> about 15 gigabytes). May vary slightly on your computer according to
> your inode density (Linux) or cluster size (Windows). Decompressed
> total size of TR01-TR34 is about 17.4 gigabytes (including *.cal
> files + their parameter files).
>
>  - Total number of detections listed in the *.cal files :  158 308 290
>
>  - Total number of objects identified by collect_stars.pl :
>          44 502 318   (20 arcsec match)
>          44 515 047   (15 arcsec match)
> Some of these objects are magnitude "99". I haven't checked yet for
> coincidences along the "join" -- 359.999 deg to 0.001 deg in RA. And
> I haven't checked for asteroids.
>
>
> The rest of these stats refer to the 15 arcsecond collection, and
> ignore objects with problem flags and/or magnitude "99"s.
>
>  - Number of stars observed once  18 574 663
>  - Number of stars observed twice   8 885 845
>  - Number of stars observed 3 to 5 times  8 089 543
>  - Number of stars observed 6 to 10 times  6 179 705
>  - Number of stars observed 11 to 20 times  1 762 318
>  - Number of stars observed 21 to 30 times  456 831
>  - Number of stars observed more than 30 times  333 074
>  - Total number observed at least once  44 281 979
>  - Most observations of any star  251
>  - Average number of observations per star    3.504
>
> Number of stars with various maximum/minimum magnitudes:
>
> mag           max V         min V            max I         min I
>  0-6               292            276             2369         2120
>  6-7             6031          5125           36 582        26 731
>  7-8           53 687        43 468         253 132      212 101
>  8-9         227 661      186 990         818 880      708 018
>  9-10      754 270       629 294       2 538 485     2 258 806
> 10-11    2 524 207     2 092 306      7 116 217     6 467 521
> 11-12    7 767 295     6 479 533    14 384 290   13 796 796
> 12-13   15 970 419   14 778 605   14 314 682   15 201 312
> 13-14   13 755 109   15 852 270     4 450 216     5 191 733
> 14-15    2 944 178      3 862 296       335 388       380 458
> 15-33     278 830         351 816        31 738          36 383
>
>
> Because I'm still not sure I'm calculating the Welch-Stetson index
> correctly I won't present those statistics yet. But here's the number
> of stars found in various amplitude ranges:
>
> range      V                    I
>  <0.1      23 171 506      27 383 180
> 0.1-0.2   6 374 517      9 190 359
> 0.2-0.5   11 968 086      7 112 395
> 0.5-1.0   2 547 393      546 339
> 1.0-2.0   202 470      45 356
>  >2.0     18 007      4350
>
> The next step is to match TASS stars to known objects.
>
>
> cheers,
>
> Fraser Farrell
>
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