J/AJ/153/20 Speckle interferometry at USNO. XXI. (Mason+, 2017)
Speckle interferometry at the U.S. Naval Observatory. XXI.
Mason B.D., Hartkopf W.I., Bredthauer G., Ferguson E.W., Finch C.T.,
Kilian C.M., Rafferty T.J., Ragan T.J., Wieder G.D.
<Astron. J., 153, 20-20 (2017)>
=2017AJ....153...20M 2017AJ....153...20M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Interferometry
Keywords: binaries: general - binaries: visual
Abstract:
The results of 2408 intensified CCD observations of double stars, made
with the 26 inch refractor of the U.S. Naval Observatory, are
presented. Each observation of a system represents a combination of
over 2000 short-exposure images. These observations are averaged into
1602 mean relative positions and range in separation from 1.94'' to
107.41'', with a median separation of 11.96''. This is the
twenty-first in this series of papers and covers the period from 2015
January 13 through 2015 December 19. Significant instrumentation
changes are reported in this paper.
Description:
This is the twenty-first in this series of papers and covers the
period from 2015 January 13 through 2015 December 19. The results of
2408 intensified CCD observations of double stars, made with the 26
inch refractor of the U.S. Naval Observatory, are presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 1540 *ICCD measurements of double stars
table2.dat 204 70 *Measurements of systems with orbits or linear solutions
table3.dat 47 4 Double stars not found
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Note on table1.dat: This table presents the mean relative position of systems
having no published orbital or rectilinear elements.
Note on table2.dat: This table presents the mean relative positions for systems
with published orbital determinations or linear solutions.
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
J/AJ/150/136 : Speckle interferometry at USNO. XX. (Hartkopf+, 2015)
J/AJ/146/56 : Speckle interferometry at the USNO. XIX. (Mason+, 2013)
J/AJ/127/539 : Speckle interferometry at USNO. IX. (Mason+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 20 A9 --- Disc Discoverer designation
22- 26 A5 --- Comp Component
28- 35 F8.3 yr Epoch [2011.81/2015.97] Epoch of observation
(expressed as a fractional Julian year)
37- 41 F5.1 deg PA [0/360]? Position angle (G1)
42 A1 --- u_PA [:] Uncertainty flag for PA (G2)
44- 49 F6.2 arcsec Sep [1.94/107.41]? Separation (G1)
50 A1 --- u_Sep [:] Uncertainty flag for Sep (G2)
52- 53 I2 --- Nobs [1/20] Number of independent measurements
(i.e., observations obtained on different
nights) contained in the mean
55 A1 --- Note [ABCD] Object notes (1)
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Note (1): The notes are defined as follows:
A = This is the vector addition of measures of other pairs;
B = This would have been published in an earlier paper in this
series, but given the large change in position this measure was not
published until its confirmation;
C = Confirming observation;
D = Unresolved (see Table3).
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 20 A9 --- Disc Discoverer designation
22- 23 A2 --- Comp Component
25- 32 F8.3 yr Epoch [2015/2016]? Epoch of observation
34- 38 F5.1 deg PA [2.8/353.4]? Position angle θ (G1)
39 A1 --- u_PA [:] Uncertainty flag for PA (G2)
41- 45 F5.2 arcsec Sep [3.76/57.33]? Separation ρ (G1)
46 A1 --- u_Sep [:] Uncertainty flag for Sep (G2)
48- 49 I2 --- Nobs [1/10]? Number of independent measurements
(i.e., observations obtained on different
nights) contained in the mean
51- 54 F4.1 deg O-Ct [-4.2/2.7]? The O-C residual in θ
56- 60 F5.2 arcsec O-Cr [-0.84/0.85]? The O-C residual in ρ
62-204 A143 --- Ref Reference for the O-C residuals
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
12- 19 A8 --- Disc Discoverer designation
21- 22 A2 --- Comp Component
24- 27 I4 yr Year [1896/1942] Year (1)
29- 31 I3 deg PA [100/245] Position angle θ (1)
33- 35 F3.1 arcsec Sep [3.5/7] Separation ρ (1)
37- 40 F4.1 mag mag1 [8.7/11.4] Published magnitude of primary
42- 45 F4.1 mag mag2 [10/11.9] Published magnitude of secondary
47 I1 --- Note [1/3]? Notes (1, 2, or 3) (2)
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Note (1): Of the most recent published observation.
Note (2): The notes are defined as follows:
1 = Despite two published measures (Espin 1922MNRAS..82..187E 1922MNRAS..82..187E, Stein 1926
Astrographic Cat, Appendix 3) there is no evidence of this pair in the
field. Although separated in time by 18 years, the measures are quite
similar, suggesting that the lack of current resolution is not due to
differential proper motion;
2 = Possibly a plate flaw was originally measured. Also not seen in Cava &
Pascal (2004 DSO 10 #3);
3 = AB was also not seen, but Jonckheere 1943JO.....26...28J 1943JO.....26...28J estimated its
magnitude as 14, which makes the nondetection insignificant.
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Global Notes:
Note (G1): A blank indicates the source was unresolved. Note that the position
angle, measured from north through east, has not been corrected for
precession, and is thus based on the equinox for the epoch of observation.
Note (G2): These lower-quality observations may be due to one or more of the
following factors: close separation, large magnitude difference, one or
both components very faint, a large zenith distance, and poor seeing or
transparency.
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History:
From electronic version of the journal
References:
Douglass et al., Paper I 1997ApJS..111..289D 1997ApJS..111..289D
Germain et al., Paper II 1999AJ....117.1905G 1999AJ....117.1905G, Cat. J/AJ/117/1905
Germain et al., Paper III 1999AJ....117.2511G 1999AJ....117.2511G, Cat. J/AJ/117/2511
Douglass et al., Paper IV 1999AJ....118.1395D 1999AJ....118.1395D, Cat. J/AJ/118/1395
Douglass et al., Paper V 2000AJ....119.3071D 2000AJ....119.3071D, Cat. J/AJ/119/3071
Mason et al., Paper VI 2000AJ....120.1120M 2000AJ....120.1120M, Cat. J/AJ/120/1120
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Mason et al., Paper VIII 2002AJ....124.2254M 2002AJ....124.2254M, Cat. J/AJ/124/2254
Mason et al., Paper IX 2004AJ....127..539M 2004AJ....127..539M, Cat. J/AJ/127/539
Mason et al., Paper X 2004AJ....128.3012M 2004AJ....128.3012M, Cat. J/AJ/128/3012
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Mason et al., Paper XIV 2008AJ....136.2223M 2008AJ....136.2223M, Cat. J/AJ/136/2223
Mason et al., Paper XV 2010AJ....140..480M 2010AJ....140..480M, Cat. J/AJ/140/480
Mason et al., Paper XVI 2011AJ....141..157M 2011AJ....141..157M, Cat. J/AJ/141/157
Mason et al., Paper XVII 2011AJ....142...46M 2011AJ....142...46M, Cat. J/AJ/142/46
Mason et al., Paper XVIII 2012AJ....143..124M 2012AJ....143..124M, Cat. J/AJ/143/124
Mason et al., Paper XIX 2013AJ....146...56M 2013AJ....146...56M, Cat. J/AJ/146/56
Hartkopf et al., Paper XX 2015AJ....150..136H 2015AJ....150..136H, Cat. J/AJ/150/136
Mason et al., Paper XXII 2017AJ....154..183M 2017AJ....154..183M, Cat. J/AJ/154/183
Mason et al., Paper XXIII 2018AJ....156..240M 2018AJ....156..240M
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 15-Jun-2017