Two successful techniques for Schmidt plate astrometry

Taff, L. G.; Lattanzi, M. G.; Bucciarelli, B.

doi:10.1086/168993

Cited by 38 publications

(18 citation statements)

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“…However, applying the same precepts to GSC-II data would fail to detect nonradial magnitude terms which we know to exist. Monet et al (2003) were able to use a special catalog (YS4.0, magnitude limit V ∼ 18) compiled from the NPM and SPM plate scans to detect and remove magnitude-dependent residual errors during the construction of USNO-B by means of the mask method (Taff et al 1990). …”

Section: Statistical Testsmentioning

confidence: 99%

The Second-Generation Guide Star Catalog: Description and Properties

Lasker

Lattanzi

McLean

et al. 2008

The Astronomical Journal

500

191

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The Guide Star Catalog II (GSC-II) is an all-sky database of objects derived from the uncompressed Digitized Sky Surveys that the Space Telescope Science Institute has created from the Palomar and UK Schmidt survey plates and made available to the community. Like its predecessor (GSC-I), the GSC-II was primarily created to provide guide star information and observation planning support for Hubble Space Telescope. This version, however, is already employed at some of the ground-based new-technology telescopes such as GEMINI, VLT, and TNG, and will also be used to provide support for the James Webb Space Telescope (JWST) and GAIA space missions as well as the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, one of the major ongoing scientific projects in China. Two catalogs have already been extracted from the GSC-II database and released to the astronomical community. A magnitude-limited (R F = 18.0) version, GSC2.2, was distributed soon after its production in 2001, while the GSC2.3 release has been available for general access since 2007. The GSC2.3 catalog described in this paper contains astrometry, photometry, and classification for 945,592,683 objects down to the magnitude limit of the plates. Positions are tied to the International Celestial Reference System; for stellar sources, the all-sky average absolute error per coordinate ranges from 0. 2 to 0. 28 depending on magnitude. When dealing with extended objects, astrometric errors are 20% worse in the case of galaxies and approximately a factor of 2 worse for blended images. Stellar photometry is determined to 0.13-0.22 mag as a function of magnitude and photographic passbands (R F , B J , I N ). Outside of the galactic plane, stellar classification is reliable to at least 90% confidence for magnitudes brighter than R F = 19.5, and the catalog is complete to R F = 20.

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Section: Statistical Testsmentioning

confidence: 99%

The Second-Generation Guide Star Catalog: Description and Properties

Lasker

Lattanzi

McLean

et al. 2008

The Astronomical Journal

500

191

View full text Add to dashboard Cite

show abstract

“…This effect has been described extensively by Taff et al (1990b) (for earlier work see Dieckvoß &de Vegt 1966 andFresneau 1978) and has been demonstrated for various Schmidt telescopes (Taff et al 1990a;Bucciarelli et al 1992;Tucholke & Schuecker 1992;Bienaymé 1993;Irwin 1994;Lopez Garcia et al 1994;Abad 1995). The systematics are probably caused by the bending of the plates to the curved focal plane during exposure.…”

Section: Correction For Systematic Errorsmentioning

confidence: 69%

“…25. Various methods for the correction of such effects have been proposed, like the subplate method (Taff et al 1990b;Smart et al 1995), least-squares collocation (Bucciarelli et al 1992), use of very high-order polynomials (Bienaymé 1993), mask method (Taff et al 1990b), or moving numerical filter (Röser et al 1995).…”

Section: Correction For Systematic Errorsmentioning

confidence: 99%

The Magellanic Catalogue of Stars (MACS)

Tucholke

Boer

Seitter

1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We have compiled the Magellanic Catalogue of Stars (MACS), a catalogue of positions for 243 561 stars covering large areas around the Large and Small Magellanic Cloud (LMC and SMC). The positions have been measured using ESO Schmidt plates and refer to the FK5 system via the PPM catalogue. A comparison of positions from different plates shows internal errors at a level of 0. 15 to 0. 23. The positional accuracy is estimated to be better than 0. 5 per coordinate for 99% of the stars. The limiting magnitude of the MACS is B ≤ 16. m 3, but the catalogue is not complete: only those stars are included which are undisturbed by close neighbours as verified by visual screening in order to obtain a clean astrometric reference. We introduce for the MACS a nomenclature and numbering system in accord with IAU rules based on position, leaving the possibility to add further stars without upsetting the numbering system. The catalogue is available via the Centre des Données Strasbourg (CDS).

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“…The method proposed here is Oth order and uses 30 reference stars. Taff et al (1990) recommended the subplate overlap method for a new reduction of GSC. However, fixing the size of a subplate creates the danger of having too few reference stars on those subplates where the reference catalogue has a low spatial star density.…”

Section: The Methods Of Plate Reductionmentioning

confidence: 99%

Guide Star Catalog Revisited - The Determination of Proper Motions

Röser

Bastian

Kuźmin

1995

International Astronomical Union Colloquium

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Abstract. We are compiling a catalogue of positions and proper motions of 4 million stars, based on the Guide Star Catalogue (GSC) and the Astrographic Catalogue (AC). The GSC is re-reduced by a method described in this paper. The AC has been newly reduced recently by us for the determination of positions and proper motions of the PPM catalogue.The expected accuracy of the proper motions of the GSC-AC catalogue ranges between 5 and 6 mas/year. Having an average star density of 100 per square degree, this catalogue will be a useful tool for the reduction of CCD frames.

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Two successful techniques for Schmidt plate astrometry

Cited by 38 publications

References 0 publications

The Second-Generation Guide Star Catalog: Description and Properties

The Second-Generation Guide Star Catalog: Description and Properties

The Magellanic Catalogue of Stars (MACS)

Guide Star Catalog Revisited - The Determination of Proper Motions

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