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I/100A Results of obs with the 6-inch transit circle (Hammond+ 1927-1982)
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Washington 10, Results of observations with the six-inch transit circle
1909-1918
Hammond J.C.
<Publ. U.S. Naval Obs. (2) 11, 665 (1927)>
=1927QB4.W32v11.....
Washington 25, 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)>
=1949QB4.W32v16p1...
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)>
=1949QB4.W32v16p1...
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)>
=1952QB4.W32v16p3...
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)>
=1964QB4.W32v19p1...
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)>
=1969QB4.W32v19p2...
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)>
=1982QB4.W32.v23p3..
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ADC_Keywords: Astrometric data; 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: W10, W25, W150, W250, W350, W450, and
W550. Proper motions and, in most catalogs, spectral types were added
from other sources.
Introduction:
W10 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.
W25 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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FileName Lrecl Records Explanations
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ReadMe 80 . This file
w10.dat 76 2428 W10
w25.dat 76 2336 W25
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
7- 9 I3 deg DMzone *Durchmusterung zone
10- 14 I5 --- DMno Durchmusterung number
15 A1 --- rem [ *] Note in DM catalog
16- 19 F4.2 mag mag ?Magnitude
20- 21 I2 h RAh Right ascension hours (eq=1910.0)
22- 23 I2 min RAm Right ascension minutes (eq=1910.0)
24- 29 F6.3 s RAs Right ascension seconds (eq=1910.0)
30- 35 F6.3 s pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37- 38 I2 deg DEd Declination degrees (eq=1910.0)
39- 40 I2 arcmin DEm Declination minutes (eq=1910.0)
41- 45 F5.2 arcsec DEs Declination seconds (eq=1910.0)
46- 51 F6.2 arcsec 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 date_RA Mean date of observations - in RA
65- 71 F7.2 yr date_DE Mean date of observations - in DEc
72- 76 A5 --- cat The source catalog
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Note on DMzone:
The Durchmusterung numbers are from the BD for stars north of -23 deg.
(1855) and are from the CD 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. The equinox for the proper
motions is the same as that for the positions.
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Byte-by-byte Description of file: w25.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- id Running number identification
7- 9 I3 deg DMzone *Durchmusterung zone
10- 14 I5 --- DMno Durchmusterung number
15 A1 --- rem [ *] Note in DM catalog
16- 19 F4.2 mag mag ?Magnitude
20- 21 I2 h RAh Right ascension hours (eq=1925.0)
22- 23 I2 min RAm Right ascension minutes (eq=1925.0)
24- 29 F6.3 s RAs Right ascension seconds (eq=1925.0)
30- 35 F6.3 s pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37- 38 I2 deg DEd Declination degrees (eq=1925.0)
39- 40 I2 arcmin DEm Declination minutes (eq=1925.0)
41- 45 F5.2 arcsec DEs Declination seconds (eq=1925.0)
46- 51 F6.2 arcsec 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 date_RA Mean date of observations - in RA
65- 71 F7.2 yr date_DE Mean date of observations - in DEc
72- 76 A5 --- cat The source catalog
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Note on DMzone:
The Durchmusterung numbers are from the BD for stars north of -23 deg.
(1855) and are from the CD 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. The equinox for the proper
motions is the same as that for the positions.
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Byte-by-byte Description of file: w50.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- id Running number identification
7- 9 I3 deg DMzone *Durchmusterung zone
10- 14 I5 --- DMno Durchmusterung number
15 A1 --- rem [ *] Note in DM catalog
16- 19 F4.2 mag mag ?Magnitude
20- 21 I2 h RAh Right ascension hours (eq=1950.0)
22- 23 I2 min RAm Right ascension minutes (eq=1950.0)
24- 29 F6.3 s RAs Right ascension seconds (eq=1950.0)
30- 35 F6.3 s pmRA *Annual proper motion in right ascension
36 A1 --- DE- Sign of declination
37- 38 I2 deg DEd Declination degrees (eq=1950.0)
39- 40 I2 arcmin DEm Declination minutes (eq=1950.0)
41- 45 F5.2 arcsec DEs Declination seconds (eq=1950.0)
46- 51 F6.2 arcsec 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 date_RA Mean date of observations - in RA
65- 71 F7.2 yr date_DE Mean date of observations - in DEc
72- 76 A5 --- cat The source catalog
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Note on DMzone:
The Durchmusterung numbers are from the BD for stars north of -23 deg.
(1855) and are from the CD 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. The equinox for the proper
motions is the same as that for the positions.
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(End) Nancy Grace Roman [ADC/SSDOO] 31-May-1996