J/AJ/160/284 2590 binary stars in Hipparcos and Gaia DR2 (Makarov, 2020)
Two-epoch orbit estimation for wide binaries resolved in Hipparcos and Gaia.
Makarov V.V.
<Astron. J., 160, 284 (2020)>
=2020AJ....160..284M 2020AJ....160..284M
ADC_Keywords: Stars, double and multiple; Proper motions; Photometry; Optical;
Parallaxes, trigonometric
Keywords: Binary stars ; Orbit determination ; Wide binary stars ; Astrometry
Abstract:
The Hipparcos catalog and its Double and Multiple System Annex (DMSA)
lists 4099 components with individual proper motions and coordinates
on the epoch 1991.25. Many of these long-period binary stars are also
present in Gaia Data Release 2 (DR2). Using the available relative
positions and proper motions separated by 24.25yr, the equations of
relative orbital motion can be solved for the two epoch eccentric
anomalies, orbital period, and eccentricity. This method employs
elimination of the linear Thiele-Innes unknowns and nonlinear
optimization of the remaining condition equations. The quality of
these solutions is compromised by the insufficient condition and
modest precision of the Hipparcos astrometric data, as revealed by
Monte Carlo simulations with artificially perturbed data points. The
presence of multiple systems and optical pairs can also perturb the
results. Limited experiments with artificial data indicate that useful
estimates can be obtained with a 25yr epoch difference for wide
binaries with orbital periods up to ∼500yr. The prospects of this
method dramatically improve with the proposed next-generation space
astrometry missions such as Gaia-NIR and Theia, especially when
additional conditions are included from astrometric or spectroscopic
measurements. An ancillary catalog of cross-identification and
astrometric information for 1295 double-star pairs cross-matched in
Gaia DR2 and Hipparcos is also published.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 245 2590 Resolved double star pairs with individual
component measurements in Hipparcos and Gaia DR2
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/341/121 : Visual binary orbits and masses (Soederhjelm 1999)
J/A+AS/144/45 : Hipparcos astrometry for 257 stars (Fabricius+, 2000)
J/AJ/120/2638 : CCD speckle obs. of binary stars. II. (Horch+, 2000)
J/AJ/128/3012 : Speckle interferometry at USNO. X. (Mason+, 2004)
J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)
J/AJ/131/3008 : Double star speckle measures (Horch+, 2006)
J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)
J/AJ/147/87 : From binaries to multiples. II. (Tokovinin, 2014)
J/MNRAS/446/2055 : Radial velocities of southern SIM grid stars (Makarov+,2015)
J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
J/MNRAS/456/2070 : Eccentricity distribution of wide binaries (Tokovinin+,2016)
J/A+A/623/A72 : Binarity of Hipparcos stars Gaia pm anomaly (Kervella+,2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos identification number (1)
8- 13 F6.3 mag Hpmag [2.8/13.8] Apparent Hipparcos magnitude
15- 29 F15.8 deg HRAdeg Hipparcos Right Ascension (J1991.25) (2)
31- 45 F15.8 deg HDEdeg Hipparcos Declination (J1991.25) (2)
47- 52 F6.2 mas Hplx Hipparcos parallax
54- 61 F8.2 mas/yr HpmRA Hipparcos proper motion in RA * cos(DE)
63- 70 F8.2 mas/yr HpmDE Hipparcos proper motion in DE
72- 77 F6.2 mas e_HRAdeg Uncertainty in HRAdeg
79- 84 F6.2 mas e_HDEdeg Uncertainty in HDEdeg
86- 91 F6.2 mas e_Hplx Uncertainty in Hplx
93- 98 F6.2 mas/yr e_HpmRA Uncertainty in HpmRA
100-104 F5.2 mas/yr e_HpmDE Uncertainty in HpmDE
106-124 I19 --- Gaia Gaia source identifier (1)
126-143 F18.11 deg GRAdeg Gaia Right Ascension (J2015.5) (2)
145-162 F18.11 deg GDEdeg Gaia Declination (J2015.5) (2)
164-171 F8.4 mas plx Gaia parallax
173-181 F9.3 mas/yr pmRA Gaia proper motion in RA * cos(DE)
183-191 F9.3 mas/yr pmDE Gaia proper motion in DE
193-198 F6.4 mas e_GRAdeg Uncertainty in RAdeg
200-205 F6.4 mas e_GDEdeg Uncertainty in DEdeg
207-212 F6.4 mas e_plx Uncertainty in plx
214-218 F5.3 mas/yr e_pmRA Uncertainty in pmRA
220-224 F5.3 mas/yr e_pmDE Uncertainty in pmDE
226-231 F6.3 mag Gmag Apparent Gaia band magnitude
233-238 F6.3 mag GBmag ? Apparent Gaia Blue band magnitude
240-245 F6.3 mag GRmag ? Apparent Gaia Red band magnitude
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Note (1): A compilation of 1295 resolved double star pairs with individual
component measurements in Hipparcos and Gaia DR2. There are 2590 rows
divided into 1295 pairs. Each pair of rows include data for the
A component (nominally, the brighter one in Hipparcos) in the first
row followed by a row of B component data.
Note (2): There is a difference in the coordinate fields, proper
motion fields, and their corresponding formal error fields. The
A-component rows (odd-numbered) include the source coordinates
and proper motion with their catalog errors of the A component. The
B-component rows (even-numbered) include *relative* parameters in
the sense B-A, and the derived errors of these differences. The
units for coordinates are different: degrees for absolute values
(A) but mas for relative coordinates (B).
Users that wish to create separate A and B components tables can do
so by splitting the table by odd and even lines. The linus 'sed'
command will do this simply:
sed -n 'p;n' table.dat> oddlines.dat
sed -n 'n;p' table.dat > evenlines.dat
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Feb-2021