J/AN/341/762 CCD observations of visual double stars. (Izmailov 2020) ================================================================================ Astrometric observations of visual double stars at Pulkovo observatory with 26-inch refractor during 2014 - 2019. Igor Izmailov, Aleksey Rublevsky, Arina Apetyan =2020AN....341...762I (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Binaries, visual; Astrometric data Keywords: visual double stars, Positional data Abstract: We present 18,365 astrometric observations of 290 visual binaries obtained with the 26-inch refractor of Pulkovo Observatory during 2014-2019. The separation between components is from 1".3 to 37" with a median value of 4".8. For a single observation, the mean separation error is 0".013, and the mean position angle error is 0.44[deg]/rho, where rho is an angular distance in arcseconds. We compare the observations of sample stars with the data from the Gaia DR2 catalog and the results of the ground-based observations performed with other telescopes. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 77 18365 Positional data of separate nights table2.dat 76 1477 Yearly average positions table3.dat 46 39 The O-C (observed minus calculated) residuals Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- WDS WDS identifier (Cat. B/wds) 12-15 A4 --- Comp Components when more than 2 17-21 A5 --- ADS ADS number 23-28 F6.3 yr Epoch Epoch of observation 30-32 I3 --- N Number of CCD frames 34-41 F8.4 deg Theta Position Angle based on the equinox for the epoch of observation (1) 43-49 F7.4 arcsec Rho Separation 51-56 F6.4 deg eTheta Standard deviation in Theta 58-63 F6.4 arcsec eRho Standard deviation in Rho 65-70 F6.4 arcsec eTheta1 Standard deviation of one CCD image in Theta 72-77 F6.4 arcsec eRho1 Standard deviation of one CCD image in Rho -------------------------------------------------------------------------------- Note (1): The position angle has not been corrected for precession, and is thus based on the equinox for the epoch of observation. Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- WDS WDS identifier (Cat. B/wds) 12-15 A4 --- Comp Components 17-21 A5 --- ADS ADS number 23-28 F6.3 yr Epoch Epoch of observation 30-31 I2 --- N Number of CCD frames 33-40 F8.4 deg Theta Position Angle based on the equinox for the epoch of observation (1) 42-48 F7.4 arcsec Rho Separation 50-55 F6.4 deg eTheta Standard deviation in Theta 57-62 F6.4 arcsec eRho Standard deviation in Rho 64-69 F6.4 arcsec eTheta1 Standard deviation of one night in Theta 71-76 F6.4 arcsec eRho1 Standard deviation of one night in Rho -------------------------------------------------------------------------------- Note (1): The position angle has not been corrected for precession, and is thus based on the equinox for the epoch of observation. Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-10 A10 --- WDS WDS identifier (Cat. B/wds) 12-13 A2 --- Comp Components 15-21 F7.4 arcsec (O-C)Rho O-C separation residual 23-29 F7.4 deg (O-C)Theta O-C position angle residual in deg 31-37 F7.4 arcsec (O-C)ThetaAS O-C position angle residual in arcsec 39-46 A8 --- Ref Observation reference (2) -------------------------------------------------------------------------------- Note (2): See http://ad.usno.navy.mil/wds/wdsnewref.txt Acknowledgements: ` Igor Izmailov, i_izmailov(at)mail.ru ================================================================================ (End) Igor Izmailov [Pulkovo Obs.] 28-Apr-2020