ACDS V10.0 - Tue Dec 05 16:29:41 CET 2023
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Detailed Description of I/284 :
The USNO-B1.0 Catalog (Monet+ 2003)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
I/284 The USNO-B1.0 Catalog (Monet+ 2003)
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The USNO-B Catalog
Monet D.G., Levine S.E., Casian B., et al.
<Astron. J., 125, 984 (2003)>
=2003AJ....125..984M
================================================================================
ADC_Keywords: Positional data; Proper motions; Surveys; Magnitudes
Description:
The USNO-B1.0 is a catalog that presents positions, proper motions,
magnitudes in various optical passbands, and star/galaxy estimators
for 1,045,913,669 objects derived from 3,648,832,040 separate
observations. The data were taken from scans of 7,435 Schmidt plates
taken from various sky surveys during the last 50 years.
The catalog is expected to be complete down to V=21; the estimated
accuracies are 0.2arcsec for the positions at J2000, 0.3mag in up to 5
colors, and 85% accuracy for distinguishing stars from non-stellar
objects.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× out.sam 250 100 Sample of data (around 0+0)
See also:
https://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas/ : USNO
Flagstaff Station Integrated Image and Catalogue Archive Service
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: out.sam
Bytes Format Units Label Explanations
1- 12 A12 --- USNO-B1.0 Designation of the object (1)
14- 25 A12 --- Tycho-2 Designation in the Tycho-2 Catalog I/259
27- 36 F10.6 deg RAdeg Right Ascension at Eq=J2000, Ep=J2000 (2)
37- 46 F10.6 deg DEdeg Declination at Eq=J2000, Ep=J2000 (2)
48- 50 I3 mas e_RAdeg Mean error on RAdeg*cos(DEdeg) at Epoch
52- 54 I3 mas e_DEdeg Mean error on DEdeg at Epoch
56- 61 F6.1 yr Epoch Mean epoch of observation (2)
63- 68 I6 mas/yr pmRA Proper motion in RA (relative to YS4.0)
70- 75 I6 mas/yr pmDE Proper motion in DE (relative to YS4.0)
77 I1 0.1 muPr ? Total Proper Motion probability (7)
79- 81 I3 mas/yr e_pmRA Mean error on pmRA
83- 85 I3 mas/yr e_pmDE Mean error on pmDE
87 I1 100mas fit_RA Mean error on RA fit
89 I1 100mas fit_DE Mean error on DE fit
91 I1 --- Ndet [0,5] Number of detections (7)
93- 95 A3 --- Flags [MsY.] Flags on object (3)
98-102 F5.2 mag B1mag ? First blue magnitude
104 I1 --- B1C ? source of photometric calibration (4)
106 I1 --- B1S ? Survey number (see "Surveys" section below)
107 A1 --- --- [-]
108-110 I3 --- B1f ? Field number in survey
112-113 I2 --- B1s/g ? Star-galaxy separation (6)
115-120 F6.2 arcsec B1xi ? Residual in X direction (5)
121-126 F6.2 arcsec B1eta ? Residual in Y direction (5)
129-133 F5.2 mag R1mag ? First red magnitude
135 I1 --- R1C ? source of photometric calibration (4)
137 I1 --- R1S ? Survey number (see "Surveys" section below)
138 A1 --- --- [-]
139-141 I3 --- R1f ? Field number in survey
143-144 I2 --- R1s/g ? Star-galaxy separation (6)
146-151 F6.2 arcsec R1xi ? Residual in X direction (5)
152-157 F6.2 arcsec R1eta ? Residual in Y direction (5)
160-164 F5.2 mag B2mag ? Second blue magnitude
166 I1 --- B2C ? source of photometric calibration (4)
168 I1 --- B2S ? Survey number (see "Surveys" section below)
169 A1 --- --- [-]
170-172 I3 --- B2f ? Field number in survey
174-175 I2 --- B2s/g ? Star-galaxy separation (6)
177-182 F6.2 arcsec B2xi ? Residual in X direction (5)
183-188 F6.2 arcsec B2eta ? Residual in Y direction (5)
191-195 F5.2 mag R2mag ? Second red magnitude
197 I1 --- R2C ? source of photometric calibration (4)
199 I1 --- R2S ? Survey number (see "Surveys" section below)
200 A1 --- --- [-]
201-203 I3 --- R2f ? Field number in survey
205-206 I2 --- R2s/g ? Star-galaxy separation (6)
208-213 F6.2 arcsec R2xi ? Residual in X direction (5)
214-219 F6.2 arcsec R2eta ? Residual in Y direction (5)
222-226 F5.2 mag Imag ? Infrared (N) magnitude
228 I1 --- IC ? source of photometric calibration (4)
230 I1 --- IS ? Survey number (see "Surveys" section below)
231 A1 --- --- [-]
232-234 I3 --- If ? Field number in survey
236-237 I2 --- Is/g ? Star-galaxy separation (6)
239-244 F6.2 arcsec Ixi ? Residual in X direction (5)
245-250 F6.2 arcsec Ieta ? Residual in Y direction (5)
Note (1): The USNO-B1.0 is arranged in zones of 0.1deg in Declination,
with objects ordered by Right Ascension in each zone.
The USNO-B1.0 is made of the zone number (from 0000 in South Pole
to 1799 in North Pole), followed by a sequential number.
Note (2): The proper motion was applied to compute the RAdeg and DEdeg
values. Please note that the large uncertainties in the proper motions
mean that the RAdeg and DEdeg are less accurate than the mean errors
e_RAdeg and e_DEdeg which apply to the position at the mean Epoch.
Note (3): . denotes the absence of any flag
M = Existence in a proper motion catalog,
s = object on a diffraction spike
Y = Correlation with YS4.0 catalog (Monet, in prep.)
Note (4): the photometric calibration is represented by a number:
0 = bright photometric standards on the plate
1 = faint photometric standard on the plate
2 = faint photometric standard one plate away (on overlap plate)
3 = faint photometric standard two plate away (on overlap of overlap)
etc
Note (5): Distance, along the x- and y- direction, of the object position
compared to the mean epoch.
Note (6): The star/galaxy separation is a measure of the similarity
of the point-spread function to a stellar profile:
0 means quite dissimilar -- i.e. a non-stellar object
11 means quite similar -- i.e. a stellar object
Note (7): For Tycho-2 stars, the Total Proper Motion probability is
not given, and the number of detections Ndet is set to zero.
For other stars, Ndet is 2 or more.
Surveys used for USNO-B1.0:
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# Name Emuls Wavelen. Zones Fld Dates
(nm) Obs.
--------------------------------------------------
0 = POSS-I 103a-O 350-500 -30..+90 936 1949-1965
1 = POSS-I 103a-E 620-670 -30..+90 936 1949-1965
2 = POSS-II IIIa-J 385-540 +00..+87 897 1985-2000
3 = POSS-II IIIa-F 610-690 +00..+87 897 1985-1999
4 = SERC-J IIIa-J 385-540 -90..-05 606 1978-1990
5 = ESO-R IIIa-F 630-690 -90..-05 624 1974-1994
6 = AAO-R IIIa-F 590-690 -90..-20 606 1985-1998
7 = POSS-II IV-N 730-900 +05..+87 800 1989-2000
8 = SERC-I IV-N 715-900 -90..+00 892 1978-2002
9 = SERC-I* IV-N 715-900 +05..+20 25 1981-2002
--------------------------------------------------
Acknowledgements:
Stephen Levine and Dave Monet, USNO Flagstaff.
History:
* 14-Nov-2002: Set of files compressed at CDS
* 17-Nov-2005: Change in the format of (xi, eta) values, which was
originally given in units of 10mas; it is now given in arcsec.
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(End) Francois Ochsenbein [CDS] 14-Nov-2002