J/AJ/151/160 1103 parallaxes and proper motions from URAT (Finch+, 2016)
Parallax results from URAT epoch data.
Finch C.T., Zacharias N.
<Astron. J., 151, 160-160 (2016)>
=2016AJ....151..160F 2016AJ....151..160F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Parallaxes, trigonometric ; Proper motions
Keywords: astrometry - parallaxes - solar neighborhood - stars: distances -
stars: statistics - surveys
Abstract:
We present 1103 trigonometric parallaxes and proper motions from the
United States Naval Observatory Robotic Astrometric Telescope (URAT)
observations taken at the Naval Observatory Flagstaff Station (NOFS)
over a three-year period from 2012 April to 2015 June covering the
entire sky north of about -10° decl. We selected two samples:
previously suspected nearby stars from known photometric distances and
stars showing a large, significant parallax signature in URAT epoch
data without any prior selection criteria. All systems presented in
this paper have an observed parallax ≥40mas with no previous
published trigonometric parallax. The formal errors on these weighted
parallax solutions are mostly between 4 and 10mas. This sample gives a
significant (of the order of 50%) increase to the number of known
systems having a trigonometric parallax to be within 25pc of the Sun
(without applying Lutz-Kelker bias corrections). A few of these are
found to be within 10pc. Many of these new nearby stars display a
total proper motion of less than 200mas/yr. URAT parallax results have
been verified against Hipparcos and Yale data for stars in common. The
publication of all significant parallax observations from URAT data is
in preparation for CDS.
Description:
We present 1103 trigonometric parallaxes and proper motions from the
United States Naval Observatory (USNO) Robotic Astrometric Telescope
(URAT) observations taken at the Naval Observatory Flagstaff Station
(NOFS).
URAT observes through a single filter (part of the dewar window) to
provide a fixed bandpass of about 680 to 760nm.
The clear aperture of the USNO astrograph is 206mm with a focal length
of only 2m. A single exposure covers 28 square degrees with a
resolution of 0.9arcsec/pixel. Each of the four large CCDs in the
focal plane covers a 2.65 by 2.65 deg area on the sky. Data of all
three years of operations (2012 April to 2015 June) at the NOFS are
used here for this parallax investigation. For more details about the
project, instrument, and observing the reader is referred to the URAT1
paper (Zacharias et al. 2015, cat. I/329).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 164 545 New trigonometric parallaxes for stars having
previous photometric distance estimates
table4.dat 164 558 New nearby star discoveries
notes.dat 695 7 Notes on individual systems
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See also:
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
I/329 : URAT1 Catalog (Zacharias+ 2015)
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
J/AJ/149/5 : Solar neighborhood. XXXV. M dwarfs distances (Winters+, 2015)
J/AJ/148/119 : UCAC4 nearby star survey (Finch+, 2014)
J/ApJ/745/118 : UCAC3 proper motion survey. II. -47<DEC<0° (Finch+, 2012)
J/AJ/142/10 : New proper motion stars 0.40''/yr>pm≥0.18''/yr (Boyd+, 2011)
J/AJ/141/21 : CCD distance estimates of SCR targets (Winters+, 2011)
J/AJ/140/844 : UCAC3 proper motion survey (Finch+, 2010)
J/AJ/130/1658 : New high proper motion stars (-47<δ<00)
(Subasavage+, 2005)
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Source identifier (1)
25- 35 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) (2)
37- 47 F11.7 deg DEdeg Declination in decimal degrees (J2000) (2)
49- 53 F5.2 mag mag [8.25/16.53] URAT magnitude (3)
55- 58 F4.2 yr Span [0.83/3.1] Epoch span
60- 62 I3 --- Nobs [10/230] Number of observations
64- 65 I2 --- Nrej [0/12] Number of rejected observations
67- 71 F5.1 mas plx [40/227.2] Absolute trigonometric parallax
73- 76 F4.1 mas e_plx [2.2/27.5] Uncertainty in plx
78- 80 F3.1 mas pcorr [0.6/4.4] Parallax correction
82- 87 F6.1 mas/yr pmRA [-875.3/894.9] Proper motion along Right
Ascension
89- 92 F4.1 mas/yr e_pmRA [1.9/43.9] Uncertainty in pmRA
94- 99 F6.1 mas/yr pmDE [-827.4/1289.6] Proper motion along Declination
101-104 F4.1 mas/yr e_pmDE [1.9/42.3]Uncertainty in pmDE
106-111 F6.3 mag Jmag [5.36/16.375]? 2MASS J band magnitude (4)
113-118 F6.3 mag Hmag [4.159/15.683]? 2MASS H band magnitude (4)
120-125 F6.3 mag Ksmag [3.684/15.817]? 2MASS Ks band magnitude (4)
127-132 F6.3 mag Bmag [1.668/18.47]? APASS B band magnitude (4)
134-139 F6.3 mag Vmag [1.493/17.527]? APASS V band magnitude (4)
141-146 F6.3 mag gmag [1.568/17.375]? APASS g band magnitude (4)
148-153 F6.3 mag rmag [1.422/16.055]? APASS r band magnitude (4)
155-160 F6.3 mag imag [1.26/15.677]? APASS i band magnitude (4)
162-164 A3 --- Note Additional notes (a=suspect fit, b, c, or d) (5)
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Note (1): In Table4, we have given a USNO Proper Motion (UPM) name for the 281
entries having no previous proper motion information reported from SIMBAD.
Note (2): At epoch 2014.0 on the International Celestial Reference System
(ICRS). In Table3, the coordinates are derived from input data in
corresponding published paper. In Table4, the coordinates are derived from
the mean URAT position at mean epoch from all epochs used in the fit along
with the URAT proper motions.
Note (3): The United States Naval Observatory (USNO) Robotic Astrometric
Telescope (URAT) observes through a single filter (part of the dewar
window) to provide a fixed bandpass of about 680 to 760nm.
Note (4): Photometric data from UCAC4 (Zacharias et al. 2012, cat. I/322) in
Table3, and from URAT1 (Zacharias et al. 2015, cat. I/329) in Table4.
Note (5): The codes for notes are defined as follows:
a = Visual inspection of the fit shows scatter indicating the solution
might be erroneous;
b = Visual inspection of the sky image shows an elongated or blended image
indicating the solution might be erroneous;
c = No correction so mean of 1.3mas used to convert from relative to
absolute parallax;
d = Large correction so cut off of 3.9mas used to convert from relative
to absolute parallax.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Source identifier
17-695 A679 --- Note Notes
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 25-Jul-2016