J/AN/341/770 Corrected proper motion for HIP stars (Damljanovic, 2020)
Latitude observations of last century to get accurate INDLS catalog of
µδ for 682 Hipparcos stars and comparison with Gaia DR2.
Damljanovic G.
<Astron. Nachrichten 341, 770-780 (2020)>
=2020AN....341..770D 2020AN....341..770D (SIMBAD/NED BibCode)
ADC_Keywords: Positional data ; Proper motions
Keywords: astrometry - reference systems - catalogs - proper motions
Abstract:
The Independent Latitude Stations (INDLS) catalog of proper motion in
declination µδ for 682 bright Hipparcos (HIP) stars is
presented. It is obtained in the Hipparcos reference frame, and only
the Hipparcos mean position at epoch 1991.25 is used for INDLS data to
calculate independent µ_δ$ (the HIP µδ values are
not entering the INDLS data). Catalog comparisons were made in pairs
for the four catalogs (HIP, new Hipparcos -- NHIP, Gaia DR2, INDLS) to
look for possible systematic differences as a function of brightness,
color, position coordinates (α, δ). All catalogs were
found in agreement, except: 0.21mas/yr for differences INDLS-DR2 in
line with the brightness, -0.13mas/yr and 0.24mas/yr for differences
HIP-DR2 in line with the free term and brightness respectively,
-0.16mas/yr, 0.23mas/yr and 0.13mas/yr for differences NHIP$-$DR2 in
line with the free term, brightness and color respectively. A slightly
better consistency is in the cases INDLS-NHIP and INDLS-DR2 than
HIP-DR2 and NHIP-DR2. The systematic error is in line with brightness
on the level 0.1mas/yr in DR2, and near 0.1mas/yr in line with color.
An indication that the bright reference frame of DR2 rotates by about
0.1mas/yr relative to the faint quasar frame is in line with a
presented sinusoidal curve of differences µδ as a function
of α. Its amplitude is A=0.53±0.11mas/yr for INDLS-DR2
(0.26±0.07 for INDLS-NHIP); about 0.2 belongs to DR2. The level of
formal errors is near 1.9mas/yr for the case INDLS-DR2, and near 1.5
for: INDLS-NHIP, HIP-DR2, NHIP-DR2. The values µδ of bright
DR2 stars could be underestimated; the astrometry is unreliable for
G≤6mag due to detector saturation.
Description:
The INDLS catalog of for 682 bright stars is presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 21 682 Independent latitude stations (INDLS) catalog of
proper motions in declination for 682 HIP stars
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/other/Ser/177.109 : Corrections to HIP proper motions (Damljanovic+, 2008)
J/other/Ser/182.35 : HIP stars corrected proper motions (Damljanovic+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 7 I6 --- HIP HIP number (Cat. I/239)
9- 16 F8.2 mas/yr pmDE Proper motion along Declination (1)
18- 21 F4.2 mas/yr s_pmDE Standard deviation on pmDE (1)
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Note (1): Epoch is 1991.25.
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Acknowledgements:
Goran Damljanovic, gdamljanovic(at)aob.rs
(End) Patricia Vannier [CDS] 17-Jul-2020