I/291 XZ Catalog of Zodiacal Stars (XZ80Q) (Herald, 2003)
XZ Catalog of Zodiacal Stars (Version XZ80Q)
Herald D.
<Canberra, Australia (August 2003)>
ADC_Keywords: Combined data ; Positional data; Zodiacal regions
Description:
The XZ catalog was created at the U.S. Naval Observatory in 1977 by
Richard Schmidt and Tom Van Flandern, primarily for the purpose of
generating predictions of lunar occultations, and for analyzing
timings of these events. It was designed to include all stars within
6d 40' of the ecliptic (the "Zodiac"), which is as far as the Moon's
limb can ever get as seen from anywhere on the Earth's surface,
leaving some margin for stellar proper motions and change in the
obliquity of the ecliptic over the course of three centuries. The
original version contained 32,221 entries; since that time, many
changes have been made in succeeding versions, including better
positions and proper motions, and the elimination and addition of
stars. Details about the history of XZ catalog can be found in the
"doc.txt" file.
The XZ80Q revision has been developed from XZ80P, which was created by
Mitsuru Soma. It is now complete over the Zodiac for stars down to
visual magnitude 12.0. The "xz80q.dat" file contains the list of stars
making the catalog; additional files provide details about double and
variable stars included in the XZ80Q. The catalog includes also lists
of the various existing names of the stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
doc.txt 93 2888 Documentation of XZ80Q
xz80q.dat 180 244437 XZ Catalog of Zodiacal Stars (XZ80Q)
xznames.dat 33 2578 Other Names of XZ80Q Stars
xzdbl.dat 197 8434 Details on double stars
xzddisc.dat 149 1027 Occultation discoveries of doubles
xzvar.dat 92 1834 Details on variable stars
agk3_xz.dat 17 20234 AGK3 Cross-IDs
fk5_xz.dat 11 204 FK5 to XZ80Q Cross-IDs
ppm_xz.dat 14 52955 PPM to XZ80Q Cross-IDs
sao_xz.dat 14 26619 SAO to XZ80Q Cross-IDs
xz_xz.dat 17 57809 Special Catalogs to XZ80Q Cross-IDs
zc_xz.dat 12 3239 ZC to XZ80Q Cross-IDs
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See also:
I/201 : XZ Catalog of Zodiacal Stars (XZ80N) (Dunham+ 1995)
I/246 : The ACT Reference Catalog (Urban+ 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/289 : The UCAC2 Catalogue (Zacharias+ 2003)
Byte-by-byte Description of file: xz80q.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- XZ [1,244437] XZ number (1)
7- 17 A11 --- DM Durchmusterung identifier (2)
18 A1 --- m_DM [CcDdWwMS] Double star code (DSC) (3)
19 A1 --- Var [EeVvSs] Variable star code (4)
20- 24 F5.2 mag Vmag ? V magnitude (see also r_Vmag)
25 A1 --- r_Vmag [ THXU] V magnitude source flag (5)
26- 27 I2 h RAh ? Right Ascension ICRS (hours), Ep=J2000 (6)
28- 29 I2 min RAm ? Right Ascension ICRS (minutes)
30- 36 F7.4 s RAs ? Right Ascension ICRS (seconds)
37- 44 F8.4 cs/yr pmRA ? Proper motion in right ascension (s/cy)
45 A1 --- DE- ? Declination ICRS (sign), Ep=J2000 (6)
46- 47 I2 deg DEd ?=90 Declination ICRS (degrees)
48- 49 I2 arcmin DEm ? Declination ICRS (minutes)
50- 55 F6.3 arcsec DEs ? Declination ICRS (seconds)
56- 63 F8.3 10mas/yr pmDE ? Proper motion in declination ("/cy)
64- 66 I3 mas plx ? Trigonometric parallax (mas)
67 A1 --- r_plx [ X] Trigonometric parallax source flag
(blank= from HIP, X= from XZ80N)
68- 73 F6.1 km/s Vr ? Radial velocity (km/s)
74 A1 --- r_Vr [ X] Radial velocity source flag
(blank= form HIC, X= from XZ80N)
75- 78 I4 mas e_RAs ? Standard error in RA*cos(Dec) at source epoch
79- 82 I4 10uas/yr e_pmRA ? Standard error in PM in RA at source epoch
83- 86 I4 mas e_DEs ? Standard error in Dec at source epoch
87- 90 I4 10uas/yr e_pmDE ? Standard error in PM in Dec at source epoch
91- 97 F7.2 yr Epoch ? Source epoch (yr)
98-102 F5.2 mag Bmag ? B magnitude
103 A1 --- r_Bmag [ BT] B magnitude source flag (5)
104-115 A12 --- SpType Spectral type
116 A1 --- r_SpType [ X] Spectral type source flag
(blank= from HIP, X= from XZ80N)
117-129 A13 --- HIP number and flags, TYC ID, or UCAC1 ID (7)
130-139 A10 --- CCDM Catalog of Components of Double & Multiples
140-141 A2 --- m_CCDM CCDM component identifiers
142-147 I6 --- SAO ? Number in SAO (Cat. I/131)
148-151 I4 --- ZC ? Number in Robertson's Zodiacal Catalog
(US Nautical Almanac, 1940USNAO..10..169R 1940USNAO..10..169R)
152-157 I6 --- PPM ? Number in PPM (Cats I/146, I/193, I/208)
158-166 A9 --- AGK AGK3 number (Cat. I/61), as (A1,I2,I5,A1) for
(sign, zone, number, addition)
167-172 I6 --- HD ? number in HD (III/135)
173-177 A5 --- HTflg Flags for HIP and TYC stars (8)
178-179 I2 --- rPos ? Source code for position and proper motion (9)
180 A1 --- n_XZ [N] 'N' indicates names in file "names.dat"
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Note (1): the XZ numbers between 1 and 32221 refer to the original version
(see e.g. the XZ80N, Cat. I/201)
Note (2): The format of the DM identifier is:
A2,A1,I2,I5
for DMcat, DMsign, DMzone, DMnum.
DMcat is [BD,SD,CD,CP] Durchmusterung (DM) identifier.
or "X " and alternative XZ number for deleted stars.
Note (3): the Double star code is:
C = double, component is in XZ80Q, Separation <1"
c = double, component not in XZ80Q, Separation <1"
D = double, component is in XZ80Q, Separation <10"
d = double, component not in XZ80Q, Separation <10"
W = double, component is in XZ80Q, Separation >10"
w = double, component not in XZ80Q, Separation >10"
M = multiple system, all components in XZ80Q
S = multiple system, some but not all in XZ80Q
Note (4): the Variable star code is:
E = eclipsing-type variable, magnitude variation >0.5 mag
e = eclipsing-type variable, magnitude variation <0.5 mag
V = other variable, magnitude variation >0.5 mag
v = other variable, magnitude variation <0.5 mag
S = suspected variable, magnitude variation >0.5 mag
s = suspected variable, magnitude variation <0.5 mag
Note (5): For Vmag, the source is
blank = Johnson V from HIP,
T = Johnson V computed from VTmag and BTmag from TYC,
H = Hpmag from HIP,
X = visual from XZ80N,
U = Internal UCAC2 magnitude (red bandpass))
For Bmag, the source flag is:
blank = Johnson B from HIP,
B = Johnson B computed from VTmag and BTmag from TYC,
T = BT magnitude from TYC
Note (6):
The position is expressed in ICRS for HIP and ACT stars, in FK5 for
other sources. In both cases, the epoch and equinox are J2000.
The declination is set to -90 for stars outside the ±7° of the
ecliptic strip: these stars have been marked as deleted by the entry
consisting of just the XZ number, an "L" in the first location of the
DM number to indicate the record is empty because of Latitude, the
visual magnitude set to 40.0, and a declination of -90 deg.
Note (7): This field may be coded in several ways:
-- For HIP stars
117(A1) 'H'
118-123(I6) [1-120416] HIP number
125(I1) [1-4] Sequential number for the same HIP number
given in HIP double/multiple systems annex
[5-8] 5 = 1+2; 6 = 1+3; 8 = 2+3
126(I1) [1-4] Number of stars with the same HIP number
given in HIP double/multiple systems annex
(bytes 125-126 are given for stars of byte 127=C)
127(A1) [CGOVX] Double/multiple systems flag indicating
further details are given in HIP annex:
C= solutions for the components
G= acceleration or higher order terms
O= orbital solutions
V= variability-induced movers
X= stochastic solution
128(A1) [FIL] Type of solution:
F= fixed double or multiple system
(identical proper motions and parallaxes),
I= individual parallaxes and linear (relative)
motion (possible optical double star)
L= linear double or multiple system
(may have different proper motions but
assumed to have same parallax)
129(A1) [ABCDS] Double/multiple star solution quality
(A=good, B=fair, C=poor, D=uncertain,
S=suspected non-single)
-- For TYC stars
117(A1) 'T'
118-129(A12) TYC ID [rrrr-nnnnn-c] where rrrr is the GSC region,
nnnnn is the GSC number in the region, and c is the
component number.
-- For UCAC stars
117(A1) 'U'
118(I1) UCAC version number
121-128(I8) UCAC sequence number
Note (8):
-- For HIP stars (these are not given for components of
double/multiple stars)
175(A1) [CDMPRU] Variability type:
C= no variability detected ("constant")
D= duplicity-induced variability
M= possibly micro-variable (amplitude < 0.03mag)
P= periodic variable
R= V-I color index was revised due to variability analysis
U= unsolved variable which does not fall in the
other categories
176(A1) [12] Additional data about variability given in HIP annex
-- For TYC stars
173(A1) [ X] Reference flag for astrometry:
blank= a recommended astrometric reference star
X= a dubious astrometric reference star in TYC
174(I1) [1-9] Astrometric quality flag:
1 to 5= very high to medium quality; probably single stars
6= perhaps non-single
7= low astrometric quality
8= perhaps non-stellar
9= very low astrometric quality
175(A1) [GN] Known variability from GCVS/NSV:
G= star in General Catalogue of Variable Stars, 4th Edition
N= star in New Catalogue of Suspected Variable Stars
176(A1) [UVW] Variability from TYC:
U= apparent variability in TYC data; may be due to duplicity
V= strong evidence of variability in the TYC data
W= variability suspected in the TYC data
177: (A1) [DRSYZ] Duplicity from TYC:
D= duplicity clearly indicated
(BTmag and VTmag refer to combined light)
R= duplicity weakly indicated,
combined with indication of variability
S= duplicity suspected
Y= investigation of duplicity made, no indication of duplicity
Z= no investigation of duplicity was performed
Note (9): Source code for position and proper motion:
01= HIP
06= PPM
07= ACRS1
09= Others (P70, K, AGK3, PCAT, LV, SAO90, L, CBSC, GC)
11= Tycho-2
12= Tycho-2 - with proper motion being for the mean position of a close pair
13= Tycho-2 - with no proper motion. Position is for epoch
14= Tycho-2 Supplement 1
15= UCAC
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Byte-by-byte Description of file: xznames.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- XZ [1,244437] XZ number
8- 33 A26 --- Name Other name (1)
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Note (1): a single name is given on each line; when several names exist
for a single XZ number, the XZ number is repeated on a subsequent line.
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Byte-by-byte Description of file: xzdbl.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- XZ-A ? XZ number of the primary (if any)
8- 13 I6 --- XZ-B ? XZ number of the secondary (if any)
15- 20 I6 --- XZ XZ number of the principle star in the system
22- 31 A10 --- WDS WDS name (based on J2000 RA and Dec)
33- 39 A7 --- Disc Double star discoverer identifier
41- 45 A5 --- Comp Double star component identifier
47- 50 I4 yr Obs1 ? Year of first observation
52- 55 I4 yr Obs2 ? Year of last observation
57- 58 I2 --- No ? Number of observations
60- 64 F5.1 deg PA1 [0,360]? Position angle at first observation
66- 70 F5.1 deg PA2 [0,360]? Position angle at last observation
71 A1 --- l_Sep1 Limit symbol on Sep2
72- 78 F7.3 arcsec Sep1 ? Separation at first observation
79 A1 --- l_Sep2 Limit symbol on Sep2
80- 86 F7.3 arcsec Sep2 ? Separation at last observation
88- 92 F5.2 mag magA ? Magnitude of primary (1)
94- 98 F5.2 mag magB ? Magnitude of secondary (1)
100-109 A10 --- SpA Spectral type of primary
110-113 I4 mas/yr pmRA ? Proper motion in RA (arc secs/1000yrs)
115-118 I4 mas/yr pmDE ? Proper motion in Declination (arc secs/1000yrs)
120-127 A8 --- DM BD/CD/CPD number
129-131 A3 --- Note [CDNOPQRaprsXZ6 ] Notes from WDS2001 (I/281) (2)
132-143 F12.6 yr Per ? Orbital period, in years
144-152 F9.6 arcsec a ? Semi-major axis of orbit, in arc secs.
154-161 F8.4 deg i ? Inclination of orbit (degrees)
163-170 F8.4 deg Omega ? Longitude of Node (degrees)
172-181 F10.5 yr T0 ? Date of periastron
183-189 F7.5 --- e ? Eccentricity of orbit
191-197 F7.3 deg omega ? Periastron (degrees)
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Note (1):
If no magnitude is given for the primary, this magnitude will usually
be a differential magnitude.
Note (2):
D: Delta Magnitude given.
N: Notes found in the WDS Notes.
O: Orbit. Where motion has exceeded 360 degrees, no values are
listed in the position angle and separation columns. Orbits may
be found in the "Fourth Catalog of Orbits of Visual Binary Stars"
(Worley and Heintz, 1983, Cat. V/39), and in the Information
Circulars published by Commission 26 of the IAU, as well as in
the literature.
P: 100 year proper motion in right ascension.
Q: 100 year proper motion in declination.
R: 100 year proper motion in right ascension and declination.
a: Pair appears in an appendix list, not part of the discoverer's
regular numbering system.
p: Coordinates and proper motions from the ACRS, PPM, IRS, and FK5 catalogs.
r: Pair was listed, but in a "rejected" list, not part of the
discoverer's regular numbering sequence.
s: Pair has other discoverer's designations and numbers in the
literature due to duplicate discovery. We have given credit to
the earliest discovery observation (and correct identification)
reported in the literature. The List of Synonyms follows the
List of Additional Discoverers.
XZ: Double identified from scan of XZ80Q for stars within 10" of each other.
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Byte-by-byte Description of file: xzddisc.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [OCC]
4- 7 I4 --- OCC Identifier for occultation discoveries (1)
8- 13 I6 --- XZ ? XZ number of the star (2)
15- 24 A10 --- WDS Name in WDS format
26- 29 I4 yr Disc.Y Date of the discovery observation (year)
30- 31 I2 "month" Disc.M ? Date of the discovery observation (month)
32- 33 I2 d Disc.D ? Date of the discovery observation (day)
35- 58 A24 --- DisName Discoverer's name
60- 83 A24 --- Ref Reference for the discovery observation.
[ON = Occultation Newsletter]
85- 88 I4 yr Conf1.Y ? Date of first confirmation observation (year)
89- 90 I2 "month" Conf1.M ? Date of first confirmation observation (month)
91- 92 I2 d Conf1.D ? Date of first confirmation observation (day)
94-101 A8 "YYYYMMDD" Conf2 Date of the second confirmation observation
103-110 A8 "YYYYMMDD" Conf3 Date of the third confirmation observation
112-119 A8 "YYYYMMDD" Conf4 Date of the fourth confirmation observation
121-130 A10 --- WDSid Double star identifier, and component.
An entry here indicates that the star has been
confirmed as double.
134-141 A8 --- DM BD/CD number
143-149 A7 --- dsFile Discoverer identifier the former dsFile (3)
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Note (1):
Identifier for occultation discoveries. The number was allocated in
order of discovery date when this file was created - but this need not
be continued for new discoveries.
Note (2): The XZ number is empty for OCC 597, see the note in section 23
of the "doc.txt" file.
Note (3): Format is iiyyMdd, where
ii = observer's initials,
yy = year; M = Month (1-9,O,N,D); dd=day
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Byte-by-byte Description of file: xzvar.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- XZ XZ number of the star.
8- 17 A10 --- VName Name of the variable star (1)
18- 27 A10 --- VType Variable type - taken directly from the GCVS.
29- 33 F5.2 mag Vmax ? Maximum magnitude
35 A1 --- l_Vmin [(<] ( = value is the amplitude of variability
< = brighter limit of minimum
36- 41 F6.3 mag Vmin ? Magnitude at minimum
42- 43 A2 --- n_Vmax [UBVRIJKPHTbyp ] Photometric system of the
magnitudes; Hp= Hipparcos, T=Tycho
44- 57 F14.6 d T0 ? Julian date of maximum (or minimum for
certain variable types)
58- 71 F14.9 d Per ? Period (days)
73- 74 I2 % Dur ? Eclipse duration (for eclipsing stars);
or Rise-time for other stars
76- 92 A17 --- SpType MK Spectral type
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Note (1): name of the variable:
- either GCVS name (II/214): usually either two letters, or a V number.
For some stars the Bayer Greek letter is given - truncated in the GCVS
to 3characters [spelling is sometimes unusual]. The constellation
abbreviation is in bytes 14-17.
- or the NSV number ("NSV" in bytes 8-10). NSV numbers are in the range
1 to 14811. The numbers from the NSV Supplement catalogue start at
15000, with the last number at the time of creating this file being
26206.
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Byte-by-byte Description of file: zc_xz.dat fk5_xz.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Number Number in FK5 (Cat. I/175) or ZC
7- 12 I6 --- XZ Corresponding XZ80Q Number
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Byte-by-byte Description of file: agk3_xz.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- AGK3 AGK3 number
12- 17 I6 --- XZ Corresponding XZ80Q Number
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Byte-by-byte Description of file: sao_xz.dat ppm_xz.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Number Number in SAO (Cat. I/131) or PPM
(Cats I/146, I/193, I/208)
9- 14 I6 --- XZ Corresponding XZ80Q Number
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Byte-by-byte Description of file: xz_xz.dat
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Bytes Format Units Label Explanations
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1 A1 --- C [BCEJKLPQ] 'Special Purpose' Catalog letter
(B for B+M)
2- 6 I5 --- Cnum Number in catalog
8- 11 A4 --- --- [= XZ]
12- 17 I6 --- XZ ? Corresponding XZ80Q Number (1)
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Note (1): when a star is not identified in XZ80Q, only the catalog
number is given.
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Acknowledgements:
This documentation is mainly an excerpt from the "doc.txt" file prepared
by David Herald, Canberra, Australia
(End) Francois Ochsenbein [CDS] 05-Nov-2003