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Table A.1
Content of the HSOY catalogue.
| Name | Unit | description | |
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| 1 | ipix | – | PPMXL object identifier |
| 2 | comp | – | flag indicating multiple Gaia matches to one PPMXL object |
| 3 | raj2000 | degrees | RA at J2000.0, epoch 2000.0 |
| 4 | dej2000 | degrees | Dec J2000.0, epoch 2000.0 |
| 5 | e_ra | degrees | Mean error: αcosδ at mean epoch |
| 6 | e_de | degrees | Mean error: δ at mean epoch |
| 7 | pmra | deg/yr | Proper motion in αcosδ |
| 8 | pmde | deg/yr | Proper motion in δ |
| 9 | e_pmra | deg/yr | Mean error in μαcosδ |
| 10 | e_pmde | deg/yr | Mean error in μδ |
| 11 | epra | yr | Mean epoch in RA (α) |
| 12 | epde | yr | Mean epoch in Dec (δ) |
| 13 | jmag | mag | 2MASS J magnitude |
| 14 | e_jmag | mag | error of 2MASS J mag. |
| 15 | hmag | mag | 2MASS H magnitude |
| 16 | e_hmag | mag | error of 2MASS H mag. |
| 17 | kmag | mag | 2MASS K magnitude |
| 18 | e_kmag | mag | error of 2MASS K mag. |
| 19 | b1mag | mag | B mag: USNO-B, 1st epoch |
| 20 | b2mag | mag | B mag: USNO-B, 2nd epoch |
| 21 | r1mag | mag | R mag: USNO-B, 1st epoch |
| 22 | r2mag | mag | R mag: USNO-B, 2nd epoch |
| 23 | imag | mag | I mag: USNO-B |
| 24 | surveys | – | Origin of USNO-B mags |
| 25 | nobs | – | total number of astrometric observations (nPPMXL + 1) |
| 26 | gaiaid | – | Gaia unique source identifier |
| 27 | Gmag | mag | mean Gaia G-band magnitude |
| 28 | e_Gmag | mag | estimated error of Gaia G-mag |
| 29 | clone | – | >1 PPMXL match to Gaia object |
| 30 | no_sc | – | object not in SuperCOSMOS |
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