I/100A Results of obs with the 6-inch transit circle (Hammond+ 1927-1982)
Washington 210, Results of observations with the six-inch transit
circle 1909-1918
Hammond J. C.
<Publ. U. S. Naval Obs. (2) 11, 665 (1927)>
Washington 025, Results of observations with the six-inch transit
circle 1925-1941
Watts C. B., Adams A. N.
<Publ. U. S. Naval Obs. (2) 16, Part I, 1 (1949)>
Washington 150, Results of observations with the six-inch transit
circle 1925-1941
Watts C. B., Adams A. N.
<Publ. U. S. Naval Obs. (2) 16, Part I, 255 (1949)>
Washington 250, Results of observations with the six-inch transit
circle 1941-1949
Watts C. B., Scott F. P., Adams A. N.
<Publ. U. S. Naval Obs. (2) 16, Part III, 447 (1952)>
Washington 350, Results of observations with the six-inch transit
circle 1949-1956
Adams A. N., Bestul S. M., Scott D. K.
<Publ. U. S. Naval Obs. (2) 19, Part I, 111 (1964)>
Washington 450, Results of observations with the six-inch transit
circle 1956-1962
Adams A. N., Bestul S. M., Scott D. K.
<Publ. U. S. Naval Obs. (2) 19, Part II, 295 (1968)>
Washington 550, Results of observations with the six-inch transit
circle 1963-1971
Hughes J. A., Scott D. K.
<Publ. U. S. Naval Obs. (2) 23, Part III, 165 (1982)>
ADC_Keywords: Positional data ; Proper motions ; Fundamental catalog
Description:
This catalog is a compilation of seven catalogs of positions derived
from observations with the six-inch transit circle of the U. S. Naval
Observatory. The observations were obtained between 1911 and 1971 and
were published in the catalogs: W210, W025, W150, W250, W350, W450,
and W550. Proper motions and, in most catalogs, spectral types were
added from other sources.
Introduction:
W210 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from May 1911 to August 16, 1918. The
probable errors of a single observation in right ascensions range from
0.014s/cos(dec.) to 0.025s/cos(dec.). As expected, these are largest
for the stars observed at low altitudes. In declination, the errors of
a single observation range from 0.25" to 1.42" with only stars below
altitude 15 deg. being greater than 0.6". The positions are reduced to
the equinox 1910.0.
W025 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from 1930.3 to 1935.4 The probable
errors of a single observation in right ascensions range from
0.012s/cos(dec.) to 0.023s/cos(dec.). As expected, these are largest
for the stars observed at low altitudes. In declination, the errors of
a single observation range from 0.30" to 0.52" with only stars below
altitude 27deg. being greater than 0.37". The positions are reduced to
the equinox 1925.0. The catalog also includes proper motions,
primarily from the GC, reduced to 1925 and magnitudes and spectral
types from the FK3, GC, or HD.
W150 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from 1936 to 1941. The probable errors
of a single observation in right ascensions range from
0.012s/cos(dec.) to 0.024s/cos(dec.). Only stars observed below the
pole or south of declination -25 deg. have probable errors greater
than 0.016s/cos(dec.). In declination, the errors of a single
observation range from 0.26" to 0.059" with only stars below altitude
27 deg. being greater than 0.35". The positions are reduced to the
equinox 1950.0. The catalog also includes proper motions, primarily
from the GC, reduced to 1950 and magnitudes and spectral types from
the FK3, GC, or HD.
W250 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from 1941 to 1949. The positions were
intended for reference stars for zone catalogs and the Lick proper
motion survey. At least 75 stars/ sq. deg. were selected, uniformly
spaced in right ascension with magnitudes in the range 5.5 to 8.5.
Priority was given to stars with favorable observing histories. No
double stars with separations in the range 1" to 10" were included.
The probable errors of a single observation in right ascensions range
from 0.12s/cos(dec.) to 0.21s/cos(dec.). As expected, these are
largest for the stars observed at low altitudes with the probable
errors greater than 0.16s/cos(dec.) only if the zenith distance was
greater than 60 deg. In declination, the errors of a single
observation range from 0.27" to 0.057" with only stars with zenith
distances greater than 65 deg. being greater than 0.40". The positions
are reduced to the equinox 1950.0.
W350 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from 1949 to 1956. A list of 255
Primary Reference Stars for Pluto was observed in February and March
1949. Seventy five stars per 100 square degrees between declinations
+35 and +50 brighter than 8.5 mag. were included to provide a
reference star grid for the Yale Photographic Zone Programs and the
Lick Proper Motion Programs. Blaauw's O- and B-type stars and Cepheids
were introduced in July 1954. The probable errors of a single
observation in right ascensions range from 0.011s/cos(dec.) to
0.023s/cos(dec.) with only those below the pole greater than
0.015s/cos(dec.). In declination, the errors of a single observation
range from 0.26" to 0.68" with only stars below the pole being greater
than 0.4". The positions are reduced to the equinox 1950.0. The
catalog also includes magnitudes and spectral types from the GC, HD or
Leander McCormick Observatory Vol. XIII.
W450 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from January 1956 to September 1962.
The probable errors of a single observation in right ascensions range
from 0.011s/cos(dec.) to 0.023s/cos(dec.) with only those measured
below the pole than 0.015s/cos(dec.). In declination, the errors of a
single observation range from 0.21" to 0.54" with only stars measured
below the pole being greater than 0.33". The positions are reduced to
the equinox 1950.0. Stars north of declination -30 deg. were included
but the emphasis was on stars north of -10 deg.
W550 contains the observations made with the six-inch transit circle
of the U. S. Naval Observatory from March 1963 through December 1971.
The primary observing list consisted of FK4 stars north of declination
-31 deg., 1409 FK4 supplemental stars, and the northern portion of the
Southern Reference Star program. Various other shorter groups of stars
were added as the work progressed. The mean errors in right ascension
range from 0.011s/cos(dec.) to 0.033s/cos(dec.) with only those south
of declination -10 deg. greater than 0.015s/cos(dec.). In declination,
the mean errors of a single observation range from 0.32" to 0.81" with
only stars below declination -20 deg. or observed below the pole being
greater than 0.4". The positions are reduced to the equinox 1950.0.
The catalog also includes magnitudes and spectral types from various
sources, particularly the GC and the Smithsonian Astrophysical
Observatory Star Catalog (SAO).
File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
w10.dat 76 2428 W210
w25.dat 76 2336 W025
w50.dat 76 30411 W150, W250, W350, W450, and W550
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Byte-by-byte Description of file: w10.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- ID Running number identification (in cat)
7-14 A8 --- DM *Durchmusterung name
15-19 F5.2 mag mag ? Visual Magnitude
20-21 I2 h RAh Right ascension hours (1910.0)
22-23 I2 min RAm Right ascension minutes (1910.0)
24-29 F6.3 s RAs Right ascension seconds (1910.0)
30-35 F6.3 s/a pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37-38 I2 deg DEd Declination degrees (1910.0)
39-40 I2 arcmin DEm Declination minutes (1910.0)
41-45 F5.2 arcsec DEs Declination seconds (1910.0)
46-51 F6.2 arcsec/a pmDE *Annual proper motion in declination
52-54 I3 --- o_RAh Number of observations - in RA
55-57 I3 --- o_DEd Number of observations - DEc
58-64 F7.2 yr EpRA Mean date of observations - in RA
65-71 F7.2 yr EpDE Mean date of observations - in DEc
72-76 A5 --- cat The source catalog
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Note on DM:
The Durchmusterung numbers are from the BD (catalogs I/119 and
I/122) for stars north of -23 deg, and are from the CD (catalog
I/114) otherwise.
Note on pmRA and pmDE:
Most of the stars with proper motions listed as 0.0 probably do not have
known motions but some may actually be zero.
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Byte-by-byte Description of file: w25.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 6 I5 --- ID Running number identification (in cat)
7-14 A8 --- DM *Durchmusterung name
15-19 F5.2 mag mag ? Visual Magnitude
20-21 I2 h RAh Right ascension hours (1925.0)
22-23 I2 min RAm Right ascension minutes (1925.0)
24-29 F6.3 s RAs Right ascension seconds (1925.0)
30-35 F6.3 s/a pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37-38 I2 deg DEd Declination degrees (1925.0)
39-40 I2 arcmin DEm Declination minutes (1925.0)
41-45 F5.2 arcsec DEs Declination seconds (1925.0)
46-51 F6.2 arcsec/a pmDE *Annual proper motion in declination
52-54 I3 --- o_RAh Number of observations - in RA
55-57 I3 --- o_DEd Number of observations - DEc
58-64 F7.2 yr EpRA Mean date of observations - in RA
65-71 F7.2 yr EpDE Mean date of observations - in DEc
72-76 A5 --- cat The source catalog
--------------------------------------------------------------------------------
Note on DM:
The Durchmusterung numbers are from the BD (catalogs I/119 and
I/122) for stars north of -23 deg, and are from the CD (catalog
I/114) otherwise.
Note on pmRA and pmDE:
Most of the stars with proper motions listed as 0.0 probably do not have
known motions but some may actually be zero.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: w50.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 6 I5 --- ID Running number identification (in cat)
7-14 A8 --- DM *Durchmusterung name
15-19 F5.2 mag mag ? Visual Magnitude
20-21 I2 h RAh Right ascension hours (1950.0)
22-23 I2 min RAm Right ascension minutes (1950.0)
24-29 F6.3 s RAs Right ascension seconds (1950.0)
30-35 F6.3 s/a pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37-38 I2 deg DEd Declination degrees (1950.0)
39-40 I2 arcmin DEm Declination minutes (1950.0)
41-45 F5.2 arcsec DEs Declination seconds (1950.0)
46-51 F6.2 arcsec/a pmDE *Annual proper motion in declination
52-54 I3 --- o_RAh Number of observations - in RA
55-57 I3 --- o_DEd Number of observations - DEc
58-64 F7.2 yr EpRA Mean date of observations - in RA
65-71 F7.2 yr EpDE Mean date of observations - in DEc
72-76 A5 --- cat The source catalog
--------------------------------------------------------------------------------
Note on DM:
The Durchmusterung numbers are from the BD (catalogs I/119 and
I/122) for stars north of -23 deg, and are from the CD (catalog
I/114) otherwise.
Note on pmRA and pmDE:
Most of the stars with proper motions listed as 0.0 probably do not have
known motions but some may actually be zero.
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(End) Nancy Grace Roman [ADC/SSDOO] 31-May-1996