J/PAZh/42/46 Pulkovo visual double stars photographic obs. (Izmailov+, 2016)
Photographic observations of visual double stars at Pulkovo:
digitization, measurement and calibration.
Izmailov I.S., Roshchina E.A., Kiselev A.A., Kiseleva T.P.,
Kalinichenko O.A., Bykov O.P., Kiyaeva O.V., Romanenko L.G., Shakht N.A.,
Maslennikov K.L., Vasil'eva T.A.
<Pis'ma Astron. Zh. 42, 46 (2016)>
=2016PAZh...42...46I 2016PAZh...42...46I (SIMBAD/NED BibCode)
=2016AstL...42...41I 2016AstL...42...41I
ADC_Keywords: Stars, double and multiple ; Positional data
Keywords: visual double stars - catalogues of relative positions -
astrometric observations
Abstract:
We present the results of determining the relative positions of the
359 pairs of stars. More then six thousands of plates had been
obtained in 1960-2007 years using the 26-inch Zeiss refractor(D=650mm,
F=10413mm, scale is 19.80-arcsec/mm) at Pulkovo (code is 084). The
plate digitization was carried out using a digital camera Canon EOS 5D
Mark II and the lens 21M Jupiter, the scale was 21um/pixel. The
measurements were calibrated using a template which was digitized by
means of the Belgian high-precision scanner ROB Digitizer. Results
were thoroughly examined for the systematic errors.
Description:
Tables contain the epochs of observations, relative positions (the
separation and position angle) of the visual double stars components,
averaged over the exposures for a plate, their errors, errors of one
measurement in the radial and transversal directions; and epochs,
relative positions, averaged for a year, their errors, errors of one
position in the radial and transversal directions.
The positional angles are given in the system of the equator and
equinox corresponding to observation moment.
Accuracy of positions is within the range of 2-70mas and is about
28mas in average for both coordinates. For a plate, the average errors
of separation and position angle are 10mas and 0.069-degrees,
respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 360 First and last epochs of measured plates,
corresponding separation and positional angles,
number of measured plates
table2.dat 85 7248 Relative positions averaged for plates
table3.dat 79 2129 Relative positions averaged for year
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ADS ? ADS name
7- 16 A10 --- WDS WDS name
18- 21 A4 --- Comp Components when more than 2
23- 30 F8.3 yr Obs1 First epoch of measured plates
32- 39 F8.4 arcsec Sep1 ? Separation at date Obs1
41- 48 F8.4 deg PA1 ? Positional angle at date Obs1 (1)
50- 57 F8.3 yr Obs2 Last epoch of measured plates
59- 66 F8.4 arcsec Sep2 ? Separation at date Obs2
68- 75 F8.4 deg PA2 ? Positional angle at date Obs2 (1)
77- 79 I3 --- N Total number of plates
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Note (1): the positional angles are in the system of the equator and equinox
corresponding to observation moment.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ADS ? ADS name
7- 16 A10 --- WDS WDS name
18- 21 A4 --- Comp Components when more than 2
23- 27 I5 --- Plate Plate ID number
29- 36 F8.3 yr Obs Epoch of observation
38- 45 F8.4 arcsec Sep Separation (averaged for exposures)
47- 52 F6.4 arcsec e_Sep Error of separation
54- 61 F8.4 deg PA Positional angle (averaged for exposures) (1)
63- 68 F6.4 deg e_PA Error of positional angle
70- 75 F6.4 arcsec s_Sep Standart deviation in radial direction
77- 82 F6.4 arcsec s_tr Standart deviation in transversal direction (2)
84- 85 I2 --- NExp Number of exposures on a plate
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Note (1): the positional angles are in the system of the equator and equinox
corresponding to observation moment.
Note (2): s_tr = Sep*sin(s_PA), where Sep is the separation in arcsec and s_PA
is the standard deviation of one measurement of positional angle in radian.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ADS ? ADS name
7- 16 A10 --- WDS WDS name
18- 21 A4 --- Comp Components when more than 2
23- 30 F8.3 yr Obs Mean epoch
32- 39 F8.4 arcsec Sep Mean separation
41- 46 F6.4 arcsec e_Sep ? Error of separation
48- 55 F8.4 deg PA Mean positional angle (1)
57- 62 F6.4 deg e_PA ? Error of positional angle
64- 69 F6.4 arcsec s_Sep ? Standart deviation of separation
71- 76 F6.4 deg s_PA ? Standart deviation of positional angle
78- 79 I2 --- N Number of plates
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Note (1): the positional angles are in the system of the equator and equinox
corresponding to mean epoch.
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History:
Elena Roshchina, star-fox(at)yandex.ru
(End) Patricia Vannier [CDS] 06-Jan-2016