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I/69 AGK3 Catalogue by Right Ascension (Dieckvoss, Heckmann 1975)
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AGK3 Catalogue
Dieckvoss W., Heckmann O.
<Hamburg-Bergedorf (1975)>
=1975QB6.A15........
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ADC_Keywords: Positional data ; Proper motions ; Magnitudes, photographic
Description:
The AGK3 catalog of positions and proper motions is a photographic
catalog based on plates taken with the same instruments as the AGK2
and referred to a network of meridian observations (the AGK3R). The
AGK2 positions were rereduced using its reference catalog, AGK2A,
reduced to the FK4 system. The positions and motions are on the FK4
system. The positional errors in one coordinate are about 0.025".
Information contained in the catalog includes in addition to the
positions and proper motions in the B1950 system, the AGK3 zone and
number, a component identification when duplicate AGK3 numbers occur,
photographic magnitude, spectral type, number of photographic
observations used to determine the position, epoch of the position,
epoch difference: AGK3 - AGK2 and the DM number and component.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
agk3_ra.doc 79 896 Original ADC documentation
agk3_ra.dat 108 183145 Data
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Byte-by-byte Description of file: agk3_ra.dat
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Bytes Format Units Label Explanations
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2 A1 --- AGK- Sign of AGK3 number.
3- 4 I2 --- ZONE AGK3 declination zone.
5- 8 I4 --- ID AGK3 number in order within zone.
10 A1 --- DUP Component id for duplicate numbers. (1)
12- 15 F4.1 mag mpg ?Photographic magnitude. (2)
17- 18 A2 --- Sp ?Spectral type. (3)
20- 21 I2 h RAh Right ascension (hours) (Equinox 1950.0).
23- 24 I2 min RAm Right ascension (minutes)
26- 31 F6.3 s RAs Right ascension (seconds)
33 A1 --- DE- Sign of declination (Equinox 1950.0).
34- 35 I2 deg DEd Declination (degrees)
37- 38 I2 arcmin DEm Declination (arcminutes)
40- 44 F5.2 arcsec DEs Declination (arcseconds)
46- 47 I2 --- Num Number of photographic observations used
to determine the position.
49- 53 F5.2 a Epoch Epoch of AGK3 position - 1900.
55 A1 --- pmRA- ?Sign of proper motion in right ascension.
56- 60 F5.3 arcsec/a pmRA ?Proper motion in right ascension. (4)
62 A1 --- pmDE- ?Sign proper motion in declination.
63- 67 F5.3 arcsec/a pmDE ?Proper motion in declination. (4)
69- 73 F5.2 a SepEp ?Epoch difference AGK3-AGK2.
75 A1 --- BD- ?Sign of zone number
76- 77 A2 --- BD ?BD catalog designation
78- 79 I2 --- BDZONE ?BD zone.
80- 84 I5 --- BDNum ?BD number within zone.
86 A1 --- pmRAt- Sign of right ascension proper motion.
87- 92 F6.4 s/a pmRAt ?Proper motion in right ascension. (5)
94 A1 --- d(RAmod)- Sign of right ascension difference.
95-100 F6.4 arcsec d(RAmod) Residual quantity of the difference. (6)
102 A1 --- d(DEmod)- Sign of declination difference.
103-108 F6.4 arcsec d(DEmod) ?Residual quantity of the difference. (7)
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Note (1): The lower case letters "a" and "b" may be present if there are
multiple components, otherwise there is a "0".
Note (2): Taken from AGK2.
Note (3): Adopted from the Henry Draper Catalogue (Cannon and Pickering
1918-1924), its Extension (Cannon 1925-1936), Schildt (Yale
Transactions) or determined by A. N. Vyssotsky and collaborators at
the Leander-McCormick Obs.
Note (4): Multiplied by cos(DEC), determined by differencing the AGK3 and AGK2
positions and dividing by the epoch difference. Proper motions are
missing for stars new in AGK3 (see Table 6). If a calculated value of
the proper motion exceeded the field capacity a value of "9.999" is
given with a "+" in byte 38.
Note (5): In units of seconds of time per year. Computed by dividing by
15cos(delta).
Note (6): Residual in right ascension (multiplied by cos(delta)) in the sense
AGK3 - (AGK2modified), where the last quantity denotes data from the
re-reduced AGK2.
Note (7): Residual in declination in the sense AGK3 - (AGK2modified).
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(End) Edward J. Shaya [SSDOO/ADC] 15-Jul-1997