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Input Catalogs

Input Catalogs. 姜碧沩 Department of Astronomy, Beijing Normal University 18-19 October 2005, Suzhou. The LAMOST Performance at Preliminary Stage. Aperture: 2.0m Limiting magnitude Fiber ： 200 Field of view: 1degree Density of sources (200 per degree square) Mount: meridian Visibility

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Input Catalogs

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  1. Input Catalogs 姜碧沩 Department of Astronomy, Beijing Normal University 18-19 October 2005, Suzhou

  2. The LAMOST Performance at Preliminary Stage • Aperture: 2.0m • Limiting magnitude • Fiber：200 • Field of view: 1degree • Density of sources (200 per degree square) • Mount: meridian • Visibility • Spectral resolution and range • Blue and visual (4000-7000A), R~2000 • Red and visual (5000-8000), R~2000 • Red (8300-8700A), R~6000

  3. Information Needed for Observation • Position • Accuracy: better than 1” • Proper motion • Photometric magnitudes (better in both blue and red bands) • High enough density of stars • Make full use of the fibers

  4. Candidate Input Catalogs • Tycho-2 • Guide Star Photometric Catalog 2 • 2MASS • USNO-B

  5. Tycho-2 • Astrometric reference catalog • Number of sources • 2.5 million • Items • Position • Proper motions • Two-color (B, V) photometric data

  6. Guide Star Photometric Catalog 2 • Photometric calibration catalog • Limiting magnitude • V=19, =0.07mag • Bands • (B), V and R

  7. 2MASS • Near-infrared all-sky photometric • Limiting magnitude • J<15.8, H<15.1 and Ks<14.3 mag • Number of sources • Number of high-quality photometry in the J band: N(J)=321M • Position error • Half arc-second

  8. USNO-B1.0 • The USNO-B1.0 is a catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,045,913,669 objects derived from 3,648,832,040 separate observations. The data were taken from scans of 7,435 Schmidt plates taken from various sky surveys during the last 50 years. • The catalog is expected to be complete down to V=21; the estimated accuracies are 0.2arcsec for the positions at J2000, 0.3mag in up to 5 colors, and 85% accuracy for distinguishing stars from non-stellar objects.

  9. Photometric Parameters Monet et al 2003 AJ 125, 984

  10. The Proper Motion Accuracy

  11. 1- 12 A12 --- USNO-B1.0 Designation of the object • 14- 25 A12 --- Tycho-2 Designation in the Tycho-2 Catalog I/259 • 27- 36 F10.6 deg RAdeg Right Ascension at Eq=J2000, Ep=J2000 • 37- 46 F10.6 deg DEdeg Declination at Eq=J2000, Ep=J2000 • 48- 50 I3 mas e_RAdeg Mean error on RAdeg*cos(DEdeg) at Epoch • 52- 54 I3 mas e_DEdeg Mean error on DEdeg at Epoch • 56- 61 F6.1 yr Epoch Mean epoch of observation • 63- 68 I6 mas/yr pmRA Proper motion in RA (relative to YS4.0) • 70- 75 I6 mas/yr pmDE Proper motion in DE (relative to YS4.0) • 77 I1 0.1 muPr Total Proper Motion probability • 79- 81 I3 mas/yr e_pmRA Mean error on pmRA • 83- 85 I3 mas/yr e_pmDE Mean error on pmDE • 87 I1 100mas fit_RA Mean error on RA fit • 89 I1 100mas fit_DE Mean error on DE fit • 91 I1 --- Ndet [2,5] Number of detections • 93- 95 A3 --- Flags [MsY.] Flags on object • 98-102 F5.2 mag B1mag First blue magnitude • 104 I1 --- B1C source of photometric calibration • 106 I1 --- B1S Survey number (see "Surveys" section below) • 108-110 I3 --- B1f Field number in survey • 112-113 I2 --- B1s/g Star-galaxy separation • 115-118 I4 10mas B1xi Residual in X direction • 119-122 I4 10mas B1eta Residual in Y direction • 125-129 F5.2 mag R1mag First red magnitude • 131 I1 --- R1C source of photometric calibration • 133 I1 --- R1S Survey number (see "Surveys" section below)

  12. 135-137 I3 --- R1f Field number in survey • 139-140 I2 --- R1s/g Star-galaxy separation • 142-145 I4 10mas R1xi Residual in X direction • 146-149 I4 10mas R1eta Residual in Y direction • 152-156 F5.2 mag B2mag Second blue magnitude • 158 I1 --- B2C source of photometric calibration • 160 I1 --- B2S Survey number (see "Surveys" section below) • 162-164 I3 --- B2f Field number in survey • 166-167 I2 --- B2s/g Star-galaxy separation • 169-172 I4 10mas B2xi Residual in X direction • 173-176 I4 10mas B2eta Residual in Y direction • 179-183 F5.2 mag R2mag Second red magnitude • 185 I1 --- R2C source of photometric calibration • 187 I1 --- R2S Survey number (see "Surveys" section below) • 189-191 I3 --- R2f Field number in survey • 193-194 I2 --- R2s/g Star-galaxy separation • 196-199 I4 10mas R2xi Residual in X direction • 200-203 I4 10mas R2eta Residual in Y direction • 206-210 F5.2 mag Imag Infrared (N) magnitude • 212 I1 --- IC source of photometric calibration • 214 I1 --- IS Survey number (see "Surveys" section below) • 216-218 I3 --- If Field number in survey • 220-221 I2 --- Is/g Star-galaxy separation • 223-226 I4 10mas Ixi Residual in X direction • 227-230 I4 10mas Ieta Residual in Y direction

  13. USNO-A2.0 • USNO-A2.0 is a catalog of 526,280,881 stars, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans that were the basis for the USNO-A1.0 catalog. The major difference between A2.0 and A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog. • A2.0 presents rightascension and declination (J2000, epoch of the mean of the blue and red plate) and the blue and red magnitude for each star. Usage of the ACT catalog as well as usage of new astrometric and photometric reduction algorithms should provide improved astrometry (mostly in the reduction of systematic errors) and improved photometry (because the brightest stars on each plate had B and V magnitudes measured by the Tycho experiment on the Hipparcos satellite). The basic format of the catalog and its compilation is the same as for A1.0, and most users should be able to migrate to this newer version with minimal effort.

  14. Comparisons Suggestion: USNO-B + 2MASS

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