J/AJ/146/76 Astrometry and photometry of UCAC4 double stars (Hartkopf+, 2013)
Double stars in the USNO CCD astrographic catalog.
Hartkopf W.I., Mason B.D., Finch C.T., Zacharias N., Wycoff G.L., Hsu D.
<Astron. J., 146, 76 (2013)>
=2013AJ....146...76H 2013AJ....146...76H
ADC_Keywords: Stars, double and multiple ; Proper motions ; Photometry ;
Interferometry
Keywords: astrometry - binaries: general - binaries: visual - catalogs
Abstract:
The newly completed Fourth USNO CCD Astrographic Catalog (UCAC4) has
proven to be a rich source of double star astrometry and photometry.
Following initial comparisons of UCAC4 results against those obtained
by speckle interferometry, the UCAC4 catalog was matched against known
double stars in the Washington Double Star Catalog in order to provide
additional differential astrometry and photometry for these pairs.
Matches to 58131 pairs yielded 61895 astrometric and 68935 photometric
measurements. Finally, a search for possible new common proper motion
(CPM) pairs was made using new UCAC4 proper motion data; this resulted
in 4755 new potential CPM doubles (and an additional 27718 astrometric
and photometric measures from UCAC and other sources).
Description:
The Fourth US Naval Observatory (USNO) CCD Astrographic Catalog
(UCAC4; Zacharias et al., 2013, cat. I/322) is a compiled, all-sky
star catalog covering mainly the 8-16 mag range in a single bandpass
between V and R. Observations for UCAC were obtained using the USNO's
1970s vintage 8inch Twin Astrograph. The detector was a Kodak 4k*4k
CCD. The entire southern hemisphere and up to about δ=+20°
was observed first from the Cerro Tololo Inter-American Observatory
between 1998 and 2001, followed by observations of the remaining parts
of the northern hemisphere from the USNO Flagstaff, AZ Station.
Observations were completed in 2004. The fourth and final catalog
(UCAC4) was released at the 2012 IAU General Assembly.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 101 ICCD speckle measurements of double stars
table2.dat 157 131931 Astrometry and photometry of known WDS pairs
table4.dat 93 4927 New possible Common Proper Motion (CPM) pairs from
UCAC4
table5.dat 157 27716 Astrometry and photometry of new possible CPM pairs
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
http://www.aavso.org/apass : AAVSO Photometric All-Sky Survey (APASS), DR6
http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/WDS : WDS catalog
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 18 A7 --- Disc Discoverer designation
20- 24 A5 --- m_Disc Component designation
26- 34 F9.4 yr Epoch Epoch (fractional Besselian year)
36- 40 F5.1 deg PA Position angle θ (1)
41 A1 --- u_PA [:] Uncertainty flag on PA
43- 47 F5.2 arcsec Sep Separation ρ
48 A1 --- u_Sep [:] Uncertainty flag on Sep
50 I1 --- N Number of independent measurements in the mean
52- 58 A7 --- Inst Camera and detector used (cam1new, cam1old,
cam2) (2)
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Note (1): The position angle has not been corrected for precession, and is thus
based on the equinox for the epoch of observation.
Note (2): Detector codes are defined as follows:
cam1old = Primary speckle camera, original ICCD. In late 2008 the primary
speckle camera was returned to US Naval Observatory (USNO). The
primary camera detector used initially was an NVSI 9540 Gen IIIc
ICCD;
cam1new = Primary speckle camera, new ICCD. The original ICCD was replaced
with a new, fiber-optically controlled NVSI 9540 Gen III ICCD in
late 2008;
cam2 = Secondary speckle camera. The first sample of USNO CCD Astrographic
Catalog (UCAC) pairs was examined using the secondary USNO speckle
camera mounted on the 26inch telescope in Washington.
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Byte-by-byte Description of file: table[25].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 18 A7 --- Disc Discoverer designation
20- 24 A5 --- m_Disc Component
26- 33 F8.3 yr Date [1892.34/2010] Epoch of observation (1)
36- 40 F5.1 deg PA [0/360.7]? Position angle
42- 44 F3.1 deg e_PA ? The 1σ uncertainty in PA
47 A1 --- f_Sep [M] M when separation is in arcminutes
48- 54 F7.3 arcsec Sep ? Separation
56- 60 F5.3 arcsec e_Sep ? The 1σ uncertainty in Sep
63- 68 F6.3 mag mag1 ? Primary magnitude in Flt
70- 75 F6.3 mag e_mag1 [-1/1]? The 1σ uncertainty in mag1 (2)
78- 83 F6.3 mag mag2 ? Secondary magnitude in Flt
85- 90 F6.3 mag e_mag2 [-1/1]? The 1σ uncertainty in mag2 (2)
94- 95 A2 --- Flt Filter (B, Bp, H, J, Ks, Ru, V, g', i', r') (3)
98-100 F3.1 m Tel [0.1/1.3] Diameter of telescope used
103-104 I2 --- N Number of observations entering into mean
106-157 A52 --- Ref Reference (4)
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Note (1): Expressed as a fractional Besselian year.
Note (2): Negative values for magnitude errors indicate the star was observed
on only one night for that magnitude; therefore, the error is purely
Poisson rather than nightly scatter. See Section 3.
Note (3): Filters are designated as:
B = APASS Johnson B;
V = APASS Johnson V;
g' = APASS SDSS g';
i' = APASS SDSS i';
r' = APASS SDSS r';
Bp = WFC Bp;
H = 2MASS H;
J = 2MASS J;
Ks = 2MASS Ks;
Ru = UCAC Ru;
Note (4): Sources are mostly:
UCAC4 = SNO CCD Astrographic Catalog (Zacharias et al., 2012, cat. I/322);
APASS = AAVSO Photometric All-Sky Survey (DR6; http://www.aavso.org/apass);
2MASS = 2MASS Point Source Catalog, 2003 all-sky release (cat. II/246).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 19 A8 --- Disc Discoverer designation
20- 23 A4 --- m_Disc Component
25- 27 I3 deg PA Position angle
29- 33 F5.1 arcsec Sep ? Separation
36- 40 F5.2 mag Vmag1 ? Primary V band magnitude (1)
42- 46 F5.2 mag Vmag2 ? Secondary V band magnitude (1)
49- 52 I4 mas/yr pmRA1 Primary proper motion in Right Ascension
54- 57 I4 mas/yr pmDE1 Primary proper motion in Declination
60- 63 I4 mas/yr pmRA2 Secondary proper motion in Right Ascension
65- 68 I4 mas/yr pmDE2 Secondary proper motion in Declination
71- 72 I2 h RAh Hour of Right Ascension (J2000) (2)
74- 75 I2 min RAm Minute of Right Ascension (J2000) (2)
77- 81 F5.2 s RAs Second of Right Ascension (J2000) (2)
83 A1 --- DE- Sign of the Declination (J2000) (2)
84- 85 I2 deg DEd Degree of Declination (J2000) (2)
87- 88 I2 arcmin DEm Arcminute of Declination (J2000) (2)
90- 93 F4.1 arcsec DEs Arcsecond of Declination (J2000) (2)
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Note (1): APASS Johnson V-band magnitude if available, otherwise UCAC magnitude.
Note (2): Of the primary.
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History:
* 08-Jul-2014: From electronic version of the journal
* 20-Aug-2014: correction in table1 for
ES 701 = 23563+5517 (originally indicated as 23565+5517)
+ correction in table2: system named "STI 730" replaced by "STI 750"
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 08-Jul-2014