Tycho-2星表格式.doc
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Thisfilegivesdescriptionsoftheformatsofthedatafiles.Theyarealso
giveninthefile"guide.ps"(orguide.pdf)inthedocsdirectory.
FileSummary:
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FileNameLreclRecordsExplanations
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catalog.dat2062539913TheTycho-2maincatalogue
suppl_1.dat12217588TheTycho-2supplement-1
suppl_2.dat1221146TheTycho-2supplement-2
index.dat429538IndextoTycho-2andsupplement-1
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Recordsareterminatedwith\r\n(CR,LF),makingthephysicalrecord
lengthstwocharacterslonger.
Inthedatafiles,thefieldsineachrecordareseparatedbyavertical
bar,|.InthisconnectiontheTYCidentifier(TYC1,TYC2andTYC3)
constitutesonefieldandthepairofaHIPnumberwithaCCDMidentifier
isalsoconsideredonefield.Intheformatdescriptions,theverticalbars
areindicatedas"1X".Ifanumericalfieldmaybeblank,thisisindicated
byaquestionmarkfollowingtherangespecificationintheExplanations
column,e.g."[]?
".
Byte-by-bytedescriptionoffile:
catalog.dat
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BytesFormatUnitsLabelExplanations
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1-4I4.4---TYC1[1,9537]+=TYC1fromTYCorGSC
(1)
GSC导星星表
6-10I5.5---TYC2[1,12121]TYC2fromTYCorGSC
(1)
12-13I1,1X---TYC3[1,3]TYC3fromTYC
(1)
14-15A1,1X---pflag[PX]meanpositionflag
(2)
平位置标志
16-28F12.8,1XdegmRAdeg[]?
MeanRightAsc,ICRS,epochJ2000(3)
平赤经,国际天球参考系,儒略历J2000,标准历元
29-41F12.8,1XdegmDEdeg[]?
MeanDecl,ICRS,atepochJ2000(3)
平赤纬
42-49F7.1,1Xmas/yrpmRA*[-4418.0,6544.2]?
prop.mot.inRA*cos(dec)
自行
50-57F7.1,1Xmas/yrpmDE[-5774.3,10277.3]?
prop.mot.inDec
58-61I3,1Xmase_mRA*[3,183]?
s.e.RA*cos(dec),atmeanepoch(5)
s.e.均方差meanepoch平均历元
62-65I3,1Xmase_mDE[1,184]?
s.e.ofDecatmeanepoch(5)
66-70F4.1,1Xmas/yre_pmRA*[0.2,11.5]?
s.e.propmotinRA*cos(dec)(5)
71-75F4.1,1Xmas/yre_pmDE[0.2,10.3]?
s.e.ofpropermotioninDec(5)
76-83F7.2,1XyrmepRA[1915.95,1992.53]?
meanepochofRA(4)
赤经的平均历元
84-91F7.2,1XyrmepDE[1911.94,1992.01]?
meanepochofDec(4)
赤纬的平均历元
92-94I2,1X---Num[2,36]?
Numberofpositionsused
95-98F3.1,1X---g_mRA[0.0,9.9]?
GoodnessoffitformeanRA(6)
平赤经的拟合精度
99-102F3.1,1X---g_mDE[0.0,9.9]?
GoodnessoffitformeanDec(6)
103-106F3.1,1X---g_pmRA[0.0,9.9]?
GoodnessoffitforpmRA(6)
赤经自行的拟合精度
107-110F3.1,1X---g_pmDE[0.0,9.9]?
GoodnessoffitforpmDE(6)
111-117F6.3,1XmagBT[2.183,16.581]?
Tycho-2BTmagnitude(7)
Tycho-2蓝(blue)星等
118-123F5.3,1Xmage_BT[0.014,1.977]?
s.e.ofBT(7)
124-130F6.3,1XmagVT[1.905,15.193]?
Tycho-2VTmagnitude(7)
Tycho-2视(visual)星等
131-136F5.3,1Xmage_VT[0.009,1.468]?
s.e.ofVT(7)
137-140I3,1X---prox[3,999]proximityindicator(8)
邻近星距离
141-142A1,1X---TYC[T]Tycho-1star(9)
143-148I6---HIP[1,120404]?
Hipparcosnumber
依巴谷编号
149-152A3,1X---CCDMCCDMcomponentidentifierforHIPstars(10)
153-165F12.8,1XdegRAdegObservedTycho-2RightAscension,ICRS
观测的Tycho-2赤经
166-178F12.8,1XdegDEdegObservedTycho-2Declination,ICRS
179-183F4.2,1XyrepRA[0.81,2.13]epoch-1990ofRadeg
1990纪元的赤经
184-188F4.2,1XyrepDE[0.72,2.36]epoch-1990ofDEdeg
189-194F5.1,1Xmase_RA*s.e.RA*cos(dec),ofobservedTycho-2RA(5)
195-200F5.1,1Xmase_DEs.e.ofobservedTycho-2Dec(5)
201-202A1,1X---posflg[DP]typeofTycho-2solution(11)
203-206F4.1---corrcorrelation(RAdeg,DEdeg)
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Note
(1):
TheTYCidentifierisconstructedfromtheGSCregionnumber
(TYC1),therunningnumberwithintheregion(TYC2)andacomponent
identifier(TYC3)whichisnormally1.Somenon-GSCrunningnumbers
wereconstructedfor