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I/276 Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002)
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The Tycho Double Star Catalogue
Fabricius C., Hog E., Makarov V.V., Mason B.D., Wycoff G.L., Urban S.E.
<Astron. Astrophys. 384, 180 (2002)>
=2002A&A...384..180F
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ADC_Keywords: Stars, double and multiple
Keywords: stars: binaries: visual - catalogs - astrometry
Abstract:
We report the discovery of 13251 visual double stars, mostly with
separations between 0.3 and 1 arcsec, from a dedicated re-reduction of
the Tycho data from the star mapper of the ESA Hipparcos satellite.
The new doubles are combined with 18160 WDS systems identified in the
Tycho-2 Catalogue, and 1220 new Tycho-2 doubles, to form the Tycho
Double Star Catalogue, TDSC, a catalogue of absolute astrometry and
BT, VT photometry for 66219 components of 32631 double and multiple
star systems. We also include results for 32263 single components for
systems unresolved in TDSC, and a supplement gives Hipparcos and
Tycho-1 data for 4777 additional components. The TDS thus contains a
total of 103259 entries. Cross identifications are given to WDS, HD,
Hipparcos and Tycho-2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 188 98482 *Main TDSC catalogue
supplem.dat 188 4777 *TDSC supplement
notes.dat 80 149 Notes
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Note on catalog.dat, supplem.dat:
The fields are separated by vertical bars, i.e. 1X = "|"
The catalogue is sorted according to an approximate right ascension of
the primary component.
See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/250 : The Tycho Reference Catalogue (Hog+ 1998)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: catalog.dat, supplem.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- TDSC [1,65210]+= TDSC number for the system
7- 8 A2 --- m_TDSC Component designation (1)
10- 11 I2 --- Nmain [0,11] Number of components in catalog (2)
13 I1 --- Nsup [0,4] Number of components in supplement (2)
15- 25 F11.7 deg RAdeg Right ascension (ICRS), at epoch EpRA
27- 37 F11.7 deg DEdeg Declination (ICRS) at epoch EpDE
39- 45 F7.2 a EpRA Epoch of right ascension
47- 53 F7.2 a EpDE Epoch of declination
55- 57 I3 mas e_RAdeg Standard error of RA*cos(dec)
59- 61 I3 mas e_DEdeg Standard error of Dec
63 A1 --- posflg [ NTH] position flag (3)
65- 71 F7.1 mas/a pmRA ? Proper motion in RA*cos(dec)
73- 79 F7.1 mas/a pmDE ? Proper motion in Dec
81- 85 F5.1 mas/a e_pmRA ? Standard err of prop mot in RA*cos(dec)
87- 90 F4.1 mas/a e_pmDE ? Standard err of prop mot in Dec
92 A1 --- pmflg [ PHX] Proper motion flag (4)
94- 98 F5.2 mag BTmag ? B_T_, Tycho blue magnitude
100-103 F4.2 mag e_BTmag ? Standard error of B_T_
105-109 F5.2 mag VTmag V_T_ or Hp magnitude
111-114 F4.2 mag e_VTmag Standard error of V_T_ or Hp
116 A1 --- magflg [ AFTBVH] photometry flag (5)
118-121 I4 --- TYC1 [1,9537] TYC1 (6)
122-127 I6 --- TYC2 [1,12119] TYC2 (6)
128-129 I2 --- TYC3 [1,4] TYC3 (6)
131-140 A10 --- WDS ? WDS id for the system (7)
142 A1 --- Note [ ADNORSTU] a note (8)
144-149 I6 --- HIP ? Hipparcos number from Tycho-2
150-151 A2 --- CCDM ? Hipparcos component identifier
153-158 I6 --- HD ? HD identifier
160-161 A2 --- Rcmp ? Reference component
163-167 F5.1 deg PA ? Position angle (9)
169-175 F7.2 arcsec Sep ? Separation (9)
177-180 F4.1 deg e_PA ? Standard error of position angle
182-184 I3 mas Sep*e_PA ? Sep * e_PA (product of the 2 quantities)
186-188 I3 mas e_Sep ? Standard error of separation
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Note (1): The running number plus the component designation gives an
unambiguous identification of the TDSC component. When possible, the
component designation is from the WDS. In cases where we have had to
assign a component designation to a WDS system, or to a system not in
WDS, we have normally assigned A,B,... according to the V_T_ magnitude.
Cases where our designations deviate from the WDS designations in a
non-trivial way, are explained in the notes.
Note (2): The main catalogue contains components detected in the Tycho-2
processing or in the new processing, while the supplement contains
components copied across from the Tycho-2 Supplement. A system in TDSC
may have components in both the main catalogue and in the supplement.
Also note that a system known in the WDS may have just one component
listed in the TDSC.
Note (3): The position flag specifies the source of the right ascension
and declination given here.
' ' = position copied from the Tycho-2 main catalogue
'N' = new Tycho position
'T' = Tycho-1 position from the Tycho-2 Supplement_1
'H' = Hipparcos position from the Tycho-2 Supplement_1
In the main catalogue only flags [ N] are used; in the supplement only
flags [TH].
Note (4): The proper motion flag specifies the source of the proper motion
given here. For close doubles which were not resolved in Tycho-2 or in
the ground based catalogues used as first epoch for computing the
proper motions, the Tycho-2 proper motions are assumed to represent
the photocentre. For Hipparcos stars with no Tycho-2 proper motion, we
give the Hipparcos proper motion instead.
' ' = Tycho-2 normal proper motion
'P' = Tycho-2 photocentre proper motion
'H' = Hipparcos proper motion
'X' = no proper motion
Note (5): Except for Hp, the photometry is always on the same system as in
Tycho-2. We expect the Tycho photometry of Hipparcos stars from
Fabricius & Makarov (2000, Cat. <J/A+A/356/141>), to be more accurate
than the normal Tycho-2 photometry.
' ' = normal photometry, either from Tycho-2 or new
'A' = normal photometry given here, but alternative photometry is
given in Fabricius & Makarov (2000, Cat. <J/A+A/356/141>)
'F' = Tycho photometry from Fabricius & Makarov (2000, Cat. <J/A+A/356/141>)
'T' = Tycho photometry from Tycho-1
'B' = B_T_ from Tycho-1, Hp is given instead of V_T_
'V' = V_T_ from Tycho-1, no B_T_
'H' = Hp is given instead of V_T_, no B_T_
In the main catalogue only flags [ A] are used; in the supplement only
flags [FTBVH].
Note (6): The TYC1 is the GSC region number, TYC2 is the running number
within the region, the TYC3 is a component identifier. TYC1 and TYC2
are copied from Tycho-2. Some new TYC3 numbers were constructed
Note (7): The WDS contains a 10 character field with approximate ICRS
coordinates for the primary component in the form hhmmm+ddmm. This
field together with the component designation identifies the relevant
entries of the WDS. Exceptions and ambiguities are explained in the
notes.
Note (8): Flag for a note, normally to the WDS identification. Some WDS
identifications need clarification, e.g. because the WDS entry gives
no designation or because the star has more than one WDS designation.
In other cases the identification is somewhat uncertain; or we may
have added new components to a known system.
' ' = no note
'A' = alternative WDS designation exists
'D' = dubious/uncertain WDS identification
'N' = a non-specific note
'O' = good quality orbit exists, cf Table 2
'R' = this WDS component is probably resolved
'S' = a close companion to a WDS component (probably)
'T' = a Tycho single star, added to a WDS system
'U' = undesignated in WDS (non-trivial) or unclear designation
Notes [ANTU] are explained in detail in the file of notes.
Note (9): Position angle and separation are computed at the mean
observational epoch for the two stars, by applying proper motion to
the right ascensions and declinations at the individual epochs of
observation. The position angle is given relative to the ICRS pole.
Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- TDSC [1,65210]+= TDSC number for the system
7- 8 A2 --- m_TDSC Component designation
10- 10 A1 --- flag [ANTU] flag indicating the kind of note (1)
13- 80 A68 --- Note Text of the note
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Note (1): Flags:
'A' = alternative WDS designation exists
'N' = a non-specific note
'T' = a Tycho single star, added to a WDS system
'U' = undesignated in WDS (non-trivial) or unclear designation
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(End) Claus Fabricius [Copenhagen Univ. Obs.] 27-Dec-2001