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VII/55 X-Ray Source Pos More Accurate than 4U or 2A, 2nd ed. (Dolan 1983)
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List of Positions of All X-Ray Sources with Positions Known More Accurately than
those Given in the 4U or 2A Catalogues, 2nd Edition
Dolan J.F.
<NASA/GSFC, private communication (1983)>
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ADC_Keywords: Astrometric data; X-ray sources
Mission_Name: Uhuru, Ariel
Description:
This catalog is a superset of the X-ray position list in the Astronomical
Almanac (1983). It is designed as an aid to observers. Either one or two
positions are given for each x-ray source. Identified counterparts
are included for many sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 156 704 X-ray position list
notes.dat 68 553 Notes
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- ID Number of the source in the Uhuru 4U Catalog
10- 41 A32 --- Alt *Other names of the source
43- 45 I3 --- Note *Note in notes file.
47- 57 A11 --- RA1 *Right Ascension (B1950) in sexagesimal units
59- 69 A11 --- DEC1 *Declination (equinox 1950)
71- 77 F7.3 deg RAdeg Right ascension (B1950) in degrees
79- 85 F7.3 deg DEdeg Declination in degrees (equinox 1950)
87- 92 F6.2 deg GLON *Galactic longitude, l(II), degrees
94- 99 F6.2 deg GLAT *Galactic latitude, b(II), degrees
101-105 I5 10fW/m2 Uflux *? 4U (2-6) kev flux, or in 10-11 ergs cm-2s-1
107-120 A14 --- Osrc *Name of optical counterpart
122-125 F4.1 mag V *? Magnitude of counterpart, V (see below)
126-127 A2 --- MagType *[ *V] Type of magnitude
129-131 A3 --- ObjType *[A CGHPQRST+] Type of object
133-143 A11 --- RA2 *Right ascension, (1950) see bytes 47-57
145-155 A11 --- DEC2 *Declination, (1950) see bytes 59-69
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Note on Alt:
Other names of the source, separated by commas. If the source has an
identified non-X-ray counterpart (see bytes 101-155 below) the first name in
this field is the discovery designation. if this field contains a non-X-ray
designation, but the source is not assigned a counterpart in bytes 101-155,
then the identification is not regarded by Dolan as well-established.
Note on Note:
This number refers to the notes file, described in notes.dat below. The
notes contain references and additional explanation.
Note on RA1:
Right ascension in hours, minutes and seconds, with colons (:)
separating the units. The seconds, or the minutes and the seconds are
often omitted. The least significant units may have a decimal fraction.
Note on DEC1:
Declination in degrees, arc minutes, and arc seconds, with colons (:)
separating the units. The seconds, or the minutes and the seconds are
often omitted. The least significant units may have a decimal fraction.
Note on GLON, GLAT:
Galactic coordinates, calculated from the equatorial coordinates given in
bytes 47-69.
Note on Uflux, Osrc, V:
Data on objects with identified optical counterparts.
The number of such objects is 346.
Note on MagType:
Type of magnitude:
* = B magnitude (otherwise the magnitude is V)
V = variable star
Note on ObjType:
Two codes may be present, separated by a plus sign. The contents of this
field are left justified.
A = globular cluster
C = cluster of galaxies
G = galaxy
H = HII region
P = pulsar
Q = quasi-stellar object
R = supernova remnant
S = stellar
T = transient (nova-like optically)
Note on RA2, DEC2:
In some cases a second set of coordinates may be present. They are
equatorial coordinates, equinox 1950. They positions used to calculate
galactic coordinates are the first set.
Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Num *Note number
4 A1 --- flag [ :] ':' if this is the first record of a note
6- 68 A63 --- note Text of note
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Note on Num:
This number is referred to in the flag in bytes 43-45 of data.dat
of this catalogue. A note may take up more than one record. If so,
all the records have the note number.
Historical Remarks:
The Catalogue of X-Ray Positions was received from J.F. Dolan in
June, 1983, as two machine-readable files of card images. The
Astronomical Almanac list was selected from a subset which contains
only sources with identified counterparts. For the present version,
text editor line numbers were removed; the format of the notes was
simplified; in-line documentation was removed (and used in this
document); multiple data records for individual objects were
combined into larger single records; galactic coordinates were
calculated; the decimal degree equatorial coordinates were recomputed;
redundant information, present in both of the component files, was
edited to appear only once. The work on this catalogue revealed an
erratum on page H65 of the Astronomical Almanac for 1984.
G65.2 + 6.7 should be G65.2 + 5.7 (R.A. 19h 32m).
See also:
7012: This catalog supersedes cat# 7012.
Acknowledgements:
The original ADC documentation by Robert S. Hill (1984) was used to create
this ReadMe file.
References:
Dolan, J. F., 1983, private communication.
Nautical Almanac Office, United States Naval Observatory, 1983, The
Astronomical almanac (United States Government Printing Office).
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(End) C.-H. Joseph Lyu [Hughes STX/NASA] 14-Jan-1997