ADC/CDS Standard Document for Catalog:/catalogs/4/4019/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
IV/19 Cordoba/Cape Durchmusterungen Cross Index (Rappaport+ 1987)
================================================================================
Cordoba/Cape Durchmusterungen Cross Index
Rappaport B.N., Warren Jr. W.H.
<unpublished>
================================================================================
ADC_Keywords: Cross identifications; Durchmusterungen
Abstract:
The fact that there are two durchmusterungen covering the southern sky
means that there is frequently a problem identifying a star with a
number in one catalog with that in another. To make this process easier,
a cross index has been prepared giving corresponding numbers for the
same star. This catalog contains two files, one sorted by Cordoba number
and the other sorted by Cape Photographic number.
Introduction:
NOTE: Because the two durchmusterungen have been made in different
colors, near the limiting magnitude, stars in one catalog may not appear
in the other. This, coupled with comparatively crude positions means
that for some stars, there will be one star in one catalog and two
stars, equally probable to be the corresponding star, in the other
catalog. The undersigned spent some time trying to resolve these
problems and concluded that, for more than 100 stars, the assignment was
impossible. Dr. Warren has informed me that he believes that he has
resolved a few additional problems and wants to work further on the
cross index. He also states that there are a number of cases in which the
positions in the two catalogs are sufficiently different that they may
not refer to the same star. However, he seems to have made little
progress for several years. Since the cross index will be generally
useful, the undersigned decided that it was more important to distribute
it as it is than to hold it longer. The user should be aware of possible
problems.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cp_cd.dat 28 359435 The cross index in CPD order
cd_cp.dat 28 359443 The cross index in CD order
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cp_cd.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- cpz Zone in the Cape Photographic Durchmusterung
4- 8 I5 --- cpn Number in the CPD
9 A1 --- cps *Supplemental letter code in CPD
10 I1 --- cpbl [9 ]? The number 9 indicates a blend of two
stars in CPD
12- 14 I3 --- cdz Zone in the Cordoba Durchmusterung
15- 19 I5 --- cdn Number in the CD
20 A1 --- cds *Supplemental letter code in CD
21 I1 --- cdbl [9 ]? The number 9 indicates a blend of two
stars in CD
22 A1 --- uncer *[ :] Colon indicates uncertain identification
23- 28 F6.2 arcmin dif ?The difference in position in the two
durchmusterungen
--------------------------------------------------------------------------------
Note on cps and cds:
Supplemental letter codes are lower case characters (e.g.,"a") as used
in the Bonner Durchmusterung for inserted stars.
Note on uncer:
Uncertainty (colon) codes usually mean that two stars in one DM are
equidistant from one star in the other catalog. The available
information indicates that the stars indicated are the most likely
identification, but this is uncertain. Preferences are generally based
on systematic positional differences for nearby stars. Magnitudes cannot
usually be used unless color information is available.
Byte-by-byte Description of file: cd_cp.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- cpz Zone in the Cordoba Durchmusterung (CD)
4- 8 I5 --- cpn Number in the CD
9 A1 --- cps *Supplemental letter code in CD
10 I1 --- cpbl [9 ]? The number 9 indicates a blend of two
stars in CD
12- 14 I3 --- cdz Zone in the Cape Photographic Durchmusterung
15- 19 I5 --- cdn Number in the CPD
20 A1 --- cds *Supplemental letter code in CPD
21 I1 --- cdbl [9 ]? The number 9 indicates a blend of two
stars in CPD
22 A1 --- uncer *[ :] Colon indicates uncertain identification
23- 28 F6.2 arcmin dif ?The difference in position in the two
durchmusterungen
--------------------------------------------------------------------------------
Note on cps and cds:
Supplemental letter codes are lower case characters (e.g.,"a") as used
in the Bonner Durchmusterung for inserted stars.
Note on uncer:
Uncertainty (colon) codes usually mean that two stars in one DM are
equidistant from one star in the other catalog. The available
information indicates that the stars indicated are the most likely
identification, but this is uncertain. Preferences are generally based
on systematic positional differences for nearby stars. Magnitudes cannot
usually be used unless color information is available.
History:
The original cross index was prepared by Rappaport on the basis of
a machine match of positions. This was carefully reviewed by Warren who
investigated many questionable identifications. Roman then studied many
particularly questionable cases. As noted above, it is probably
impossible to resolve all of these.
Acknowledgements:
The undersigned thanks Drs. Rappaport and Warren for providing the cross
index data.
References:
Gill, D and Kapteyn, J. C., 1895-1900, Cape Ann. 3-5
Thome, J. M., 1892-1932, Resultados del Obs. Nac. Argentino 19, 17, 18,
21
================================================================================
(End) Nancy G. Roman [ADC/SSDOO] 12-Nov-1996