Washington Double Star Supplemental Catalog (WDSS) - formats
Format for the summary lines are as follows:
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01 001-014 a14 WDSS identifier
02 016-018 a3 Component identifier
03 025-028 i4 dates of first/last observation
04 030-032 i3 Number of astrometric observations
05 034-036 i3 deg First/last position angle
06 038-043 f6.2 arcsec First/last separation (arcseconds or as noted)
07 044-044 a1 Flag for separation units
m = mas
M = arcminutes
D = degrees
08 046-050 f5.2 mag Primary/secondary visual magnitudes
09 051-051 a1 Flag for filter:
blank = Gaia DR2 584/436 nm G filter (default)
b = blue
r = red
g = SDSS g (477/280 nm)
10 053-057 f5.2 mag Primary/secondary infrared magnitudes
11 058-058 a1 Flag for filter:
blank = K-band (default)
h = H-band
j = J-band
12 060-064 a5 Spectral type of primary/secondary
13 066-081 2f8.2 mas/y Proper motion (RA and DEC) of primary/secondary
14 083-089 f7.2 mas Parallax of primary/secondary
15 091-114 a24 Alternate name for primary/secondary. Default is the Gaia Second
Data Release, or DR2 designation, which constituted 99.2% of
all alternte designations as of Nov 2021. Next most common is
the Gaia Early Third Data Release, or ER3 designation (0.3%).
16 116-117 2a1 Note flags:
C = pair has both orbit and linear solutions, uncertain which
is correct
L = pair has rectilinear solution in Linear Elements Catalog
N = see note in notes file
O = pair has orbital solution in the Sixth Orbit Catalog
U = pair is optical, based on parallax, proper motion, or
other factors
V = pair is physical, based on parallax, proper motion, or
other factors
X = pair is bogus (due to error in published coordinates,
plate flaw identified as star, or other problem)
17 119-136 Coordinates (J2000) of primary/secondary
2i2,f5.2 hhmmss.ss Right ascension
a1,2i2,f4.1 +ddmmss.s Declination
18 138-147 a10 Designation in main WDS of component matching object in that catalog
19 149-155 a7 Discoverer designation in main WDS catalog
20 156-160 a5 Component designation in main WDS catalog
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Format for measurement lines are as follows:
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01 001-014 a14 WDSS identifier
02 017-023 a7 Component pair identifier
03 025-034 f10.5 Date of observation (Julian epoch)
04 036-036 a1 Position angle flag
: = value is uncertain/estimated
L = originally published as nf, sp, etc.
q = quadrant has been flipped 180deg from published value
V = measure is a vector separation along this angle vector
05 037-043 f7.3 deg Position angle
06 045-050 f6.3 deg Position angle error
07 052-052 a1 Separation flag
: = value is uncertain/estimated
< = separation is less than quoted value
E = pair elongated
U = pair unresolved/single
G,O,S,V,X = Hipparcos non-component double star solutions or
suspected non-single
R = pair resolved but no separation give
D = separation is in degrees
M = separation is in arcminutes
m = separation is in milliarcseconds
08 053-061 f9.5 arcsec Separation (arcseconds or as noted by separation flag)
09 063-063 a1 Separation error flag
P, F, G, V = quality flags (poor, fair, etc.)
> = error is lower limit to true value
< = error is upper limit to true value
10 064-070 f7.5 arcsec Separation error (same units as separation)
11 072-072 a1 Primary magnitude flag
> = magnitude is lower limit to true value
v = primary is variable
12 073-078 f6.3 mag Primary magnitude
13 079-079 a1 Primary magnitude error flag
> = error is lower limit to true value
< = error is upper limit to true value
14 080-084 f5.3 mag Primary magnitude error
15 086-086 a1 Secondary magnitude flag
> = magnitude is lower limit to true value
s = magnitude rather than magnitude difference (only used if
primary magnitude field is blank)
f = star is too faint
v = secondary is variable
16 087-092 f6.3 mag Secondary magnitude, or magnitude difference if primary
magnitude field is blank
17 093-093 a1 Secondary magnitude error flag
> = error is lower limit to true value
< = error is upper limit to true value
18 094-098 f5.3 mag Secondary magnitude error
19 100-107 2i4 nm Filter effective wavelength and FWHM
or 2f4.1
20 108-108 a1 Filter flag
a = value is average of multiple filters
u = wavelength is in microns
m = wavelength is in mm
c = wavelength is in cm
M = wavelength is in meters
B = blue filter (effective wavelength/FWHM values unknown)
K = IR filter (effective wavelength/FWHM values unknown)
R = red filter (effective wavelength/FWHM values unknown)
X = X-ray band (effective wavelength/FWHM values unknown)
n = no filter used
? = filter information is uncertain
: =filter information is approximate
21 110-114 f5.1 m Telescope aperture
22 115-115 a1 Telescope aperture flag
a = average of multiple telescopes
k = multiple aperture telescope, baseline in km
23 117-118 i2 Number of nights averaged into mean measure
24 120-127 a7 Reference code (see file wdsref.memo)
25 129-130 a2 Technique code (see table below)
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Technique codes for measurement lines:
(Note: a plus sign (+) in the technique columns of wdsref.memo indicates the paper contains measures
made by more than one similar method. For example, H+ means the paper includes measures from more
than one space-based technique.)
A = adaptive optics
Aa = adaptive optics with apodizing phase plate
Ac = CHARA adaptive optics
Ad = adaptive optics spectral deconvolution technique
Ag = laser-guided AO
Al = adaptive optics imaging, keeping only selected images ("lucky imaging")
Am = adaptive optics with aperture mask
Ao = adaptive optics coronagraph
As = AO + dark speckle coronagraph
Aw = adaptive optics with coronagraph and "well-corrected subaperture"
C = CCD or other two-dimensional electronic imaging
Ca = area scanner
Cc = IR coronagraph
Ce = electronographic camera
Cg = imaging using Gaussian aperture pupil mask
Ci = IR direct imaging
Cl = short-exposure CCD imaging, keeping only selected images ("lucky imaging")
Cp = IR imaging polarimetry
Cs = IR one-dimensional slit scanning
Cu = USNO CCD imaging (speckle-style reduction)
D = Heliometer
E = Wide-field CCD or other two-dimensional electronic imaging
E2 = 2MASS (Two Micron All-Sky Survey)
Ed = DENIS (Deep Near-Infrared Survey)
Ek = UKIDSS (UKIRT Infrared Deep Sky Survey)
Ep = PPMX, PPMXL
Er = USNO URAT
Es = SDSS (Sloan Digital Sky Survey)
Eu = UCAC
Ey = Yale SPM (Southern Proper Motion) Survey
H = Hipparcos/Tycho, HST, Spitzer, or other space-based technique
Ha = HST + ACS
Hc = Chandra
He = Einstein
Hf = HST + Fine Guidance Sensor
Hg = Gaia
Hh = Hipparcos
Hi = Spitzer Space Telescope + IRAC (Infrared Array Camera)
Hk = Kepler
Hm = Spitzer Space Telescope + MIPS (Multiband Imaging Photometer for Spitzer)
Hn = HST + NICMOS IR direct imaging
Ho = HST + Faint Object Camera
Hp = HST + WFPC2 Planetary Camera
Hs = HST + STIS
Ht = Tycho
Hw = WISE (Wide-field Infrared Survey Explorer) satellite (IR imaging)
Hx = Spitzer Space Telescope + SpeX spectrometer and slit-viewing camera
Hz = XMM Newton satellite
I = interferometric technique
Ig = phase grating interferometer
Im = Michelson interferometer
J = visual interferometer
[aperture value indicates the longest baseline on the monolithic mirror
(e.g., 0.7m for Finsen's eyepiece interferometer or 6.1m for the 20-foot
beam used on the Mount Wilson 100inch)]
Jm = Mount Wilson 100inch telescope rotating interferometer (Anderson, Merrill)
Jp = Mount Wilson 20-foot beam interferometer (Pease)
K = long-baseline visual/IR/radio interferometer
(aperture value indicates the longest baseline used)
K2 = CERGA 2-telescope interferometer
Ka = VLTI/AMBER
Kb = BIMA
Kc = CHARA Array
Ke = European VLBI network
Kf = CHARA Array (separated fringe packet data)
Kg = global VLBI array
Ki = IOTA
Kk = Keck interferometer
Kl = VLA/VLBA
Km = Mark III
Kn = NPOI/NOI [Navy (Prototype) Optical Interferometer]
Kp = PTI (Palomar Testbed Interferometer)
Kr = radio/IR aperture synthesis technique
Ks = SUSI (Sydney University Stellar Interferometer)
Ku = Pulkovo Stellar Interferometer
M = micrometry technique
Ma = micrometer with refractor
Mb = micrometer with reflector
Mc = comparison image micrometer
Md = visual measures with a double-image micrometer
Mg = illuminated-reticle micrometer (e.g. Celestron Micro-Guide)
Mr = RGO use of micrometer plus comparison image micrometer on same star
O = occultation
P = photographic technique
Pa = photographic, with astrograph
Pb = USNO-B photographic, with multiple astrographs
Pc = Astrographic Catalog
Pe = ESO Schmidt astrograph
Pk = AGK Catalog
Po = photographic, with medium or long-focus technique or ocular enlargement
Pp = Palomar Observatory Sky Survey POSS-I: 1948-1958, 48in/1.2m Schmidt
POSS-II: 1985-1999, 48in/1.2m Schmidt
Pu = UK Schmidt Southern Survey 1974-1987, 48in/1.2m Schmidt
S = speckle interferometric technique
Sa = aperture masking technique (MAPPIT, etc.)
Sb = bispectrum speckle interferometric technique
Sc = CHARA speckle
Si = IR speckle
Sp = speckle polarimetry
Ss = shift-and-add technique
St = Tokovinin "hrcam"
Su = USNO speckle
T = Transit circle / Meridian circle
Tm = "Eyepiece micrometer" transit/chronometric technique
V = visual estimate
X = spectroscopic technique
Xg = visual estimate made with an objective grating
Xh = high-resolution spectroscopy
Xl = low-resolution spectroscopy
Xr = resolved spectroscopy
Xs = spectrophotometry
Z = photometric technique
Z = photometer
Zc = CCD photometry
Zd = photocell with diaphragm in focal plane
Zp = visual photometry with a double-image or polarizing photometer
Zw = wedge photometer
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wdss.......... comp.... frst nnn th1 rho1..* vmag1* kmag1* spec1 pm1............. par1... name1................... ** coords1........... wds_old... dd_old.comp.
last th2 rho2..* vmag2* kmag2* spec2 pm2............. par2... name2................... coords2...........
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1234567+123456 Aa1.... 1234 123 123 123.45* 12.34* 12.34* A1Iab +1234.56+1234.56 1234.56 123456789012345678901234 XY 123456.78+123456.7 12345+1234 XYZ1234AB,CD
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0000004+054750 A 2008 1 25 13.17 20.87g . K7 . . . SLW 0000+0547 V 000000.44+054750.7
0000004+054750 B 2008 25 13.17 22.08g . M1 . . . 000000.82+054802.6
0000004+054750 AB 2008.8151 25. . 13.17 . 26.285 0.449 24.040 0.985 355 120 2.5 1 Dhi2015 Es
0000004+054750 AB 2008.8151 . . . . 20.868 0.038 22.083 0.103 477 280 2.5 1 Dhi2015 Es
0000004+054750 AB 2008.8151 . . . . 19.479 0.017 20.531 0.038 623 280 2.5 1 Dhi2015 Es
0000004+054750 AB 2008.8151 . . . . 18.844 0.017 19.688 0.033 762 300 2.5 1 Dhi2015 Es
0000004+054750 AB 2008.8151 . . . . 18.447 0.037 19.120 0.065 913 240 2.5 1 Dhi2015 Es
0000010+151505 A 1998 2 211 4.13 20.09g 14.63 M1 . . . SLW 0000+1515 V 000001.06+151505.1
0000010+151505 B 2000 212 4.08 16.54g 13.46 K2 28.4 -1.9 . 2MASS J00000091+1515015 000000.92+151501.7
0000010+151505 AB 1998.883 211.0 . 4.126 . 14.524 . 13.979 . 1256 245 1.3 1 TMA2003 E2
0000010+151505 AB 1998.883 . . . . 14.923 0.170 13.528 0.035 1633 160 1.3 1 TMA2003 E2
0000010+151505 AB 1998.883 . . . . 14.627 0.093 13.456 0.046 2210 300 1.3 1 TMA2003 E2
0000010+151505 AB 2000.7388 212. . 4.08 . 22.554 0.255 18.720 0.018 355 120 2.5 1 Dhi2015 Es
0000010+151505 AB 2000.7388 . . . . 20.092 0.017 16.539 0.004 477 280 2.5 1 Dhi2015 Es
0000010+151505 AB 2000.7388 . . . . 18.271 0.008 15.635 0.005 623 280 2.5 1 Dhi2015 Es
0000010+151505 AB 2000.7388 . . . . 17.410 0.007 15.314 0.005 762 300 2.5 1 Dhi2015 Es
0000010+151505 AB 2000.7388 . . . . 16.952 0.013 15.147 0.006 913 240 2.5 1 Dhi2015 Es
0003431-075506 A 2009 1 61 9.67 21.21g 15.21 M2 . . . SLW 0003-0755 V 000343.16-075506.1
0003431-075506 B 2009 61 9.67 21.48g 15.83 M2 . . . 2MASS J00034378-0755014 000343.74-075501.5
0003431-075506 AB 2009.7897 61. . 9.67 . 22.374 0.457 22.927 0.731 355 120 2.5 1 Dhi2015 Es
0003431-075506 AB 2009.7897 . . . . 21.206 0.048 21.480 0.061 477 280 2.5 1 Dhi2015 Es
0003431-075506 AB 2009.7897 . . . . 19.865 0.024 20.040 0.027 623 280 2.5 1 Dhi2015 Es
0003431-075506 AB 2009.7897 . . . . 18.648 0.013 18.829 0.014 762 300 2.5 1 Dhi2015 Es
0003431-075506 AB 2009.7897 . . . . 18.092 0.028 18.207 0.031 913 240 2.5 1 Dhi2015 Es
0003431-075506 A 2009 1 92 10.08 21.21g 15.21 M2 . . . SLW 0003-0755 V 000343.16-075506.1
0003431-075506 C 2009 92 10.08 21.52g 15.56 M2 . . . 2MASS J00034383-0755065 000343.84-075506.4
0003431-075506 AC 2009.7897 92. . 10.08 . 22.374 0.457 26.031 0.908 355 120 2.5 1 Dhi2015 Es
0003431-075506 AC 2009.7897 . . . . 21.206 0.048 21.521 0.063 477 280 2.5 1 Dhi2015 Es
0003431-075506 AC 2009.7897 . . . . 19.865 0.024 19.862 0.024 623 280 2.5 1 Dhi2015 Es
0003431-075506 AC 2009.7897 . . . . 18.648 0.013 18.667 0.013 762 300 2.5 1 Dhi2015 Es
0003431-075506 AC 2009.7897 . . . . 18.092 0.028 18.106 0.028 913 240 2.5 1 Dhi2015 Es
0003431-075506 B 2009 1 163 5.16 21.48g 15.83 M2 . . . 2MASS J00034378-0755014 000343.74-075501.5
0003431-075506 C 2009 163 5.16 21.52g 15.56 M2 . . . 2MASS J00034383-0755065 000343.84-075506.4
0003431-075506 BC 2009.7897 163. . 5.16 . 22.927 0.731 26.031 0.908 355 120 2.5 1 Dhi2015 Es
0003431-075506 BC 2009.7897 . . . . 21.480 0.061 21.521 0.063 477 280 2.5 1 Dhi2015 Es
0003431-075506 BC 2009.7897 . . . . 20.040 0.027 19.862 0.024 623 280 2.5 1 Dhi2015 Es
0003431-075506 BC 2009.7897 . . . . 18.829 0.014 18.667 0.013 762 300 2.5 1 Dhi2015 Es
0003431-075506 BC 2009.7897 . . . . 18.207 0.031 18.106 0.028 913 240 2.5 1 Dhi2015 Es
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