Class information for:
Level 1: REFERENCE SYSTEMS//ASTROMETRY//HIPPARCOS

Basic class information
Class id #P Avg. number of
references		 Database coverage
of references
8630 1234 20.7 40%


Bar chart of Publication_year

Last years might be incomplete

Hierarchy of classes
The table includes all classes above and classes immediately below the current class.


Cluster id Level Cluster label #P
19 4 ASTRONOMY & ASTROPHYSICS//ASTROPHYSICAL JOURNAL//ASTRON 523489
19 3       ASTRONOMY & ASTROPHYSICS//ASTROPHYSICAL JOURNAL//ASTRON 118981
158 2             GLOBULAR CLUSTERS GENERAL//ASTRONOMY & ASTROPHYSICS//STARS ABUNDANCES 22875
8630 1                   REFERENCE SYSTEMS//ASTROMETRY//HIPPARCOS 1234

Terms with highest relevance score


rank Term termType Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 REFERENCE SYSTEMS authKW 2235794 17% 43% 210
2 ASTROMETRY authKW 2199531 36% 20% 447
3 HIPPARCOS authKW 1000139 4% 84% 48
4 CATALOGS authKW 246060 11% 7% 133
5 PHOTOGRAPHIC ASTROMETRY authKW 158355 1% 80% 8
6 STELLAR PROPER MOTIONS authKW 103096 0% 83% 5
7 ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES journal 77661 9% 3% 107
8 RADIO STARS authKW 77319 0% 63% 5
9 ASTRONOMICAL JOURNAL journal 77288 17% 1% 211
10 ESTEC ASTROPHYS address 75769 1% 44% 7

Web of Science journal categories


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with term
in class
1 Astronomy & Astrophysics 65714 94% 0% 1160
2 Remote Sensing 42 1% 0% 12
3 Engineering, Aerospace 18 1% 0% 10
4 Geochemistry & Geophysics 1 1% 0% 12
5 History & Philosophy of Science 0 0% 0% 2
6 Mathematics, Interdisciplinary Applications 0 1% 0% 7
7 Multidisciplinary Sciences 0 0% 0% 4
8 Optics 0 2% 0% 20
9 Mining & Mineral Processing -0 0% 0% 1
10 Meteorology & Atmospheric Sciences -0 1% 0% 8

Address terms


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 ESTEC ASTROPHYS 75769 1% 44% 7
2 NIKOLAEV ASTRON OBSERV 74230 0% 100% 3
3 OPT ASTRON JOINT 74230 0% 100% 3
4 EUROPEAN SPACE TECHNOL ASTROPHYS 65980 0% 67% 4
5 GRP ESTUDOS ASTRON OV 49487 0% 100% 2
6 OCA CNRS URA 1360 49487 0% 100% 2
7 UMR8630 35621 0% 24% 6
8 NVI INC 25766 0% 21% 5
9 UMR 8630 25230 1% 10% 10
10 ALL RUSSIA STATE 24743 0% 100% 1

Journals


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES 77661 9% 3% 107
2 ASTRONOMICAL JOURNAL 77288 17% 1% 211
3 ASTRONOMY & ASTROPHYSICS 45647 25% 1% 305
4 IAU SYMPOSIA 31299 8% 1% 100
5 CELESTIAL MECHANICS 10252 1% 3% 16
6 ASTRONOMISCHE NACHRICHTEN 9987 3% 1% 37
7 KINEMATICS AND PHYSICS OF CELESTIAL BODIES 9606 1% 4% 11
8 ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS 9014 2% 1% 29
9 PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 7109 3% 1% 39
10 ASTROPHYSICS AND SPACE SCIENCE 6053 5% 0% 56

Author Key Words


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class		 LCSH search Wikipedia search
1 REFERENCE SYSTEMS 2235794 17% 43% 210 Search REFERENCE+SYSTEMS Search REFERENCE+SYSTEMS
2 ASTROMETRY 2199531 36% 20% 447 Search ASTROMETRY Search ASTROMETRY
3 HIPPARCOS 1000139 4% 84% 48 Search HIPPARCOS Search HIPPARCOS
4 CATALOGS 246060 11% 7% 133 Search CATALOGS Search CATALOGS
5 PHOTOGRAPHIC ASTROMETRY 158355 1% 80% 8 Search PHOTOGRAPHIC+ASTROMETRY Search PHOTOGRAPHIC+ASTROMETRY
6 STELLAR PROPER MOTIONS 103096 0% 83% 5 Search STELLAR+PROPER+MOTIONS Search STELLAR+PROPER+MOTIONS
7 RADIO STARS 77319 0% 63% 5 Search RADIO+STARS Search RADIO+STARS
8 FUNDAMENTAL STARS AND OTHER OBJECTS 74230 0% 100% 3 Search FUNDAMENTAL+STARS+AND+OTHER+OBJECTS Search FUNDAMENTAL+STARS+AND+OTHER+OBJECTS
9 STARS INDIVIDUAL HD 23642 74230 0% 100% 3 Search STARS+INDIVIDUAL+HD+23642 Search STARS+INDIVIDUAL+HD+23642
10 PROPER MOTIONS 59455 2% 10% 23 Search PROPER+MOTIONS Search PROPER+MOTIONS

Core articles
The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.


Rank Reference # ref.
in cl.		 Shr. of ref. in
cl.		 Citations
1 VAN LEEUWEN, F , (1997) THE HIPPARCOS MISSION.SPACE SCIENCE REVIEWS. VOL. 81. ISSUE 3-4. P. 201 -+ 59 70% 22
2 ASSAFIN, M , VIEIRA-MARTINS, R , ANDREI, AH , CAMARGO, JIB , DA SILVA, DN , (2013) RIO SURVEY OF OPTICAL ASTROMETRIC POSITIONS FOR 300 ICRF2 SOURCES AND THE CURRENT OPTICAL/RADIO FRAME LINK STATUS BEFORE GAIA.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. VOL. 430. ISSUE 4. P. 2797-2814 30 71% 5
3 FEY, AL , GORDON, D , JACOBS, CS , MA, C , GAUME, RA , ARIAS, EF , BIANCO, G , BOBOLTZ, DA , BOCKMANN, S , BOLOTIN, S , ET AL (2015) THE SECOND REALIZATION OF THE INTERNATIONAL CELESTIAL REFERENCE FRAME BY VERY LONG BASELINE INTERFEROMETRY.ASTRONOMICAL JOURNAL. VOL. 150. ISSUE 2. P. - 18 69% 18
4 VAN LEEUWEN, F , (2005) RIGHTS AND WRONGS OF THE HIPPARCOS DATA - A CRITICAL QUALITY ASSESSMENT OF THE HIPPARCOS CATALOGUE.ASTRONOMY & ASTROPHYSICS. VOL. 439. ISSUE 2. P. 805-822 26 74% 21
5 ASSAFIN, M , VIEIRA-MARTINS, R , NETO, DND , CAMARGO, JIB , ANDREI, AH , (2011) THE INFLUENCE OF RADIO-EXTENDED STRUCTURES ON OFFSETS BETWEEN THE OPTICAL AND VLBI POSITIONS OF SOURCES IN THE ICRF2.ASTRONOMY & ASTROPHYSICS. VOL. 532. ISSUE . P. - 22 73% 1
6 MALKIN, Z , (2016) USING RADIO STARS TO LINK THE GAIA AND VLBI REFERENCE FRAMES.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. VOL. 461. ISSUE 2. P. 1937 -1942 15 94% 0
7 STONE, RC , MONET, DG , MONET, AKB , WALKER, RL , ABLES, HD , BIRD, AR , HARRIS, FH , (1996) THE FLAGSTAFF ASTROMETRIC SCANNING TRANSIT TELESCOPE (FASTT) AND STAR POSITIONS DETERMINED IN THE EXTRAGALACTIC REFERENCE FRAME.ASTRONOMICAL JOURNAL. VOL. 111. ISSUE 4. P. 1721 -1742 35 63% 34
8 CAMARGO, JIB , DAIGNE, G , DUCOURANT, C , CHARLOT, P , (2005) NEAR-INFRARED ASTROMETRY AND PHOTOMETRY OF SOUTHERN ICRF QUASARS.ASTRONOMY & ASTROPHYSICS. VOL. 437. ISSUE 3. P. 1135-U16 20 83% 4
9 MIGNARD, F , KLIONER, S , LINDEGREN, L , BASTIAN, U , BOMBRUN, A , HERNANDEZ, J , HOBBS, D , LAMMERS, U , MICHALIK, D , RAMOS-LERATE, M , ET AL (2016) GAIA DATA RELEASE 1 REFERENCE FRAME AND OPTICAL PROPERTIES OF ICRF SOURCES.ASTRONOMY & ASTROPHYSICS. VOL. 595. ISSUE . P. - 18 69% 0
10 MALKIN, ZM , (2016) THE SECOND VERSION OF THE OCARS CATALOG OF OPTICAL CHARACTERISTICS OF ASTROMETRIC RADIO SOURCES.ASTRONOMY REPORTS. VOL. 60. ISSUE 11. P. 996 -1005 19 66% 0

Classes with closest relation at Level 1


Rank Class id link
1 27486 CELESTIAL MECHNICS STELLAR DYNAMICS//CONJUGATE EXPONENTIAL FAMILY//INFORMAT ENGN ENGN
2 19387 UMR 8028//MECAN CELESTE CALCUL EPHEMERIDES//EPHEMERIDES
3 20562 PHYSICAL LIBRATIONS//CELESTIAL MECHANICS//ILOM
4 4928 BINARIES VISUAL//OBSERVATORY//BINARIES SPECTROSCOPIC
5 1505 GALAXY KINEMATICS AND DYNAMICS//GALAXY STRUCTURE//GALAXY HALO
6 28355 PL ASTRON//METHODS OF ASTRONOMICAL OBSERVATIONS//90 DEGREE
7 6722 EARTH ROTATION//POLAR MOTION//ATMOSPHERIC ANGULAR MOMENTUM
8 16119 ASTEROID DEFLECTION//ORBIT DETERMINATION//PLANETARY DEFENSE
9 700 STARS LOW MASS BROWN DWARFS//BROWN DWARFS//STARS LOW MASS
10 3524 OPEN CLUSTERS AND ASSOCIATIONS GENERAL//GALAXY OPEN CLUSTERS AND ASSOCIATIONS GENERAL//OPEN CLUSTERS AND ASSOCIATIONS INDIVIDUAL NGC 6791

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