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[vsnet-id 49] More on Williams coordinate file

     My thanks to Kato-san for adding Gareth ("Graff") Williams' comprehensive
coordinates file to the VSNET archives.  This represents a tremendous amount
of work on Graff's part over the last several years, and I hope this will
greatly ease the burden of the Sternberg group improving the positions for
GCVS stars.  Having worked with Graff both on asteroid astrometry and on
variable-star identifications (see IBVS 4448-4451), I know that he is pretty
picky about getting things right.  Thus although he is an error-prone human
like the rest of us, the list is probably about as good as man and machine can
contrive to produce.
     Some additional words are in order about the file.  Those who have
downloaded the file have noticed the format is very wide, which was necessary
to accomodate everything on a single line per star.  As best I can tell it is
170 columns wide.  Graff is used to working with a 220-column format for
asteroid orbits, so this one is comparatively narrow!
     One of the big conveniences of the file is that citations are given for
the source charts.  As part of our correspondence about the file, Graff sent
me a list of papers for which he has done a complete job, and those for which
only some of the stars were worked over.  I append this below directly from his
messages.  (Having to deal with hundreds of thousands of asteroid observations
every month forces Graff to be well-organized!)  These are papers that for the
most part don't need to be dealt with---and tells us what still needs work.
Given that he's buried in astrometry from the major asteroid surveys,
additional lists of variables from him will probably be slow in coming, so this
may be regarded as complete.  Graff did tell me that if he gets more positions,
he will pass them along to us.

\Brian

========================

   The list of completed references (i.e., everything id'd) is as follows:

     AJ 67, 360

     AN 204, 429
     AN 281, 179
     AN 284, 165

     Astron. Tsirk. 940
     Astron. Tsirk. 943

     IBVS 705, 748, 749, 771, 967, 1401, 1406, 1421, 2157, 2601, 2640, 2878,
          3855, 4329, 4342, 4343, 4345, 4360

     JO 46, No. 4, 126

     KVB 9 [Only those with charts]

     Louv. Publ. 133
     Louv. Publ. 137

     MN 97, 541
     MN 98, 65

     Padova Publ. 164 (Mem. S. A. It. 44, No. 1, 53)
     Padova Publ. 166 (Mem. S. A. It. 44, No. 2, 273)

     Perem. Zvez. 5, 331
     Perem. Zvez. 15, No. 1, 109 
     Perem. Zvez. 15, No. 2, 164
     Perem. Zvez. 15, No. 5, 531
     Perem. Zvez. 16, No. 4, 482

     Perem. Zvez. Pirl. 3, 201
     Perem. Zvez. Pril. 3, 216

     Ric. Astr. 2, No. 7
     Ric. Astr. 2, No. 10
     Ric. Astr. 3, No. 1
     Ric. Astr. 3, No. 7
     Ric. Astr. 3, No. 14
     Ric. Astr. 3, No. 15
     Ric. Astr. 3, No. 16
     Ric. Astr. 6, No. 1
     Ric. Astr. 6, No. 5
     Ric. Astr. 6, No. 6
     Ric. Astr. 6, No. 7
     Ric. Astr. 6, No. 8
     Ric. Astr. 6, No. 9
     Ric. Astr. 6, No. 11
     Ric. Astr. 6, No. 14
     Ric. Astr. 6, No. 15
     Ric. Astr. 6, No. 16
     Ric. Astr. 6, No. 17
     Ric. Astr. 6, No. 22
     Ric. Astr. 6, No. 28
     Ric. Astr. 7, No. 4
     Ric. Astr. 7, No. 6
     Ric. Astr. 7, No. 16
     Ric. Astr. 7, No. 18
     Ric. Astr. 8, No. 3
     Ric. Astr. 8, No. 8
     Ric. Astr. 8, No. 9
     Ric. Astr. 8, No. 10

     Sonn. Mitt. 9
     Sonn. Mitt. 10
     Sonn. Mitt. 12

     Vatican Obs. Publ. 1, No. 11


In addition, significant progress has been made on the following
(missing objects are indicated, in some cases candidates were found
but were not measured):

     AN 289, H. 5, 205      S 9520 (= SN 1965K), S 9610, S 9641, S 9642,
                            S 9649, S 9655, S 9674, S 9682, S 9704

     AN 290, 43             S 9748, S 9753, S 9757, S 9760, S 9767, S 9768,
                            S 9777, S 9784, S 9800, S 9801, S 9803, S 9814,
                            S 9815, S 9818, S 9824, S 9831, S 9832, S 9843
                            S 9850, S 9860, S 9862, [S 9882-S 10159 not
                            examined], S 10065, S 10070, S 10071, S 10074,
                            S 10075, S 10084, S 10085, S 10088, S 10093
                            [S 10094-S 10152 not examined]

     Berg. Abh. 6, No. 1    HBV 243, HBV 258, HBV 271, HBV 273, X 06,

     IBVS 1145              12 (NSV 13756)

     Leid. Obs. Ann. 22, 147    17 (CN Nor)

     Louv. Publ. 134        5 (AV Oct)

In at least a handful of cases for the "missing" objects listed above, I
can find the stars in the USNO.  Clearly, some of these references were
processed prior to the availability of the USNO.


Completed references (numbers are as in the GCVS references list):

137, 174, 565, 675, 846, 856, 1237, 1306, 1314, 1319, 1320, 1925, 2773,
2774, 2775, 2776, 2778, 2958, 4043 [Correct reference is Louv. Publ. 137,
not Louv. Publ. 126], 4117 [Correct refercence is Louv. Publ. 133, not
Louv. Publ. 126], 4245, 4247, 4254, 4255, 4258, 4266, 4401, 4411, 4413,
4414, 4424, 4761, 5542, 5564, 5701, 5874, 5875, 6325, 6503, 6873, 6895,
7011, 7474, 7749, 7950, 7951, 8202, 8206, 8361, 8392, 8475, 8984, 9012,
9068.


------------------------------------------------------------------------
Gareth V. Williams, MS 18, 60 Garden Street, Cambridge, MA 02138, U.S.A.
Associate Director, IAU Minor Planet Center
E-mail address suppressed         http://cfa-www.harvard.edu/iau/mpc.html
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