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Start Over Subject astrometry Validation Level 2
421. Positions of 502 Stars in Pleiades Region
ID:
ivo://CDS.VizieR/I/90
Title:
Positions of 502 Stars in Pleiades Region
Short Name:
I/90
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalog contains the positions (equinox B1900.0 and epoch B1955.0) of 502 stars in a region of about 1.5 degrees square in the Pleiades cluster, centered on Eta Tau. These coordinates have been derived from measurements of stellar images obtained with 65 exposures of various durations on 14 photographic plates with two telescopes at McCormick Observatory and Van Vleck Observatory. The plates were reduced by the plate overlap method, which resulted in a high degree of systematic accuracy in the final positions. Data in the machine version include Hertzsprung number, color index, photovisual magnitude, right ascension and declination and their standard errors, proper motion, and differences between the present position and previous works. Data for exposures, plates, and images measured, present in the published catalog, are not included in the machine version.
422. Positions of Thebe and Amalthea
ID:
ivo://CDS.VizieR/J/other/KFNT/15.483
Title:
Positions of Thebe and Amalthea
Short Name:
J/other/KFNT/15.
Date:
21 Oct 2021
Publisher:
CDS
Description:
The file jovsat.dat contains 35 intersatellite positions of inner Jovian moons Thebe and Amalthea, derived from the observations made with the 2-m Zeiss RCC telescope of Terskol Observatory (Terskol peak, Northern Caucasus, long=42.50083{deg}, lat= 43.27427{deg}, h=3100m) in 1998. The Two-Channel Focal Reducer of the Max-Planck Institute for Aeronomy (MPAe,Germany) was used for acquisition of the images. We provide delta(alpha) and delta(delta) of Thebe and Amalthea with respect to the Galilean satellites, that were used as the reference points forming the reference direction on the frames. Astrometric topocentric coordinates J2000.0 of the Galilean satellites were used for scale and orientation angle determination. The array scale was corrected for differential refraction and differential aberration to first-order. All observed positions are compared with the theoretical ones.
423. Positions of Triton with Sheshan Station telescope
ID:
ivo://CDS.VizieR/J/AJ/161/237
Title:
Positions of Triton with Sheshan Station telescope
Short Name:
J/AJ/161/237
Date:
20 Jan 2022
Publisher:
CDS
Description:
The large time span and precise observational data of natural satellites is of great significance for updating their ephemerides and studying their dynamic characteristics. With the help of the new image-processing methods and the Gaia DR2 catalog, all CCD images of Triton taken with the 1.56m telescope of Shanghai Astronomical Observatory during 2005-2009 were reanalyzed. The median filtering algorithm is used for image preprocessing to remove the influence of the halo of Neptune, and an upgraded modified moment, called the intensity-square-weighted centroiding method, is applied to determine the centroids of the stars and Triton. A total of 2299 positions of Triton were obtained, including 263 new observed positions and 2036 updated observed positions. Such five-year time span data with high precision will be very helpful to improve the orbit parameters of Triton.
424. Positions of X-Ray Sources, 2nd ed.
ID:
ivo://CDS.VizieR/IX/6
Title:
Positions of X-Ray Sources, 2nd ed.
Short Name:
IX/6
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalog is a superset of the X-ray position list in the Astronomical Almanac (1983). It is designed as an aid to observers. Either one or two positions are given for each X-ray source. Identified counterparts are included for many sources.
425. Positions & proper motions of radio stars
ID:
ivo://CDS.VizieR/J/A+A/312/1031
Title:
Positions & proper motions of radio stars
Short Name:
J/A+A/312/1031
Date:
21 Oct 2021
Publisher:
CDS
Description:
The optical positions of 63 extragalactic nebulae measured in the frame defined by the annual series of Carlsberg Meridian Catalogues Nos 1-8 are compared with their VLBI radio positions in the International Celestial Reference Frame. The differences between these radio and optical positions are interpreted as showing the global distortion of the Carlsberg optical frame, which is linked to that of the FK5. North of the equator the Carlsberg optical frame is within 0.05" of the ICRF; but south of the equator it deviates by 0.07" in right ascension and 0.10" in declination. The general form of the deviations follow those of the FK5, which are revealed in a recent comparison of FK5 with a preliminary version of the Hipparcos catalogue (H30).
426. PPMX Catalog of positions and proper motions
ID:
ivo://CDS.VizieR/I/312
Title:
PPMX Catalog of positions and proper motions
Short Name:
I/312
Date:
21 Oct 2021
Publisher:
CDS
Description:
PPM-Extended (PPMX) is a catalogue of 18,088,919 stars containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system. PPMX consists of three parts: a) a survey complete down to R_U_=12.8 in the magnitude system of UCAC2; b) additional stars of high-precision proper motions, and c) all other stars from GSC 1.2 identified in 2MASS. The typical accuracy of the proper motions is 2mas/y for 66 percent of the survey stars (a) and the high-precision stars (b), and about 10mas/y for all other stars. PPMX contains photometric information from ASCC-2.5 and 2MASS.
427. PPMXL Catalog Cone Search
ID:
ivo://xaovo/ppmxl/q/cone
Title:
PPMXL Catalog Cone Search
Short Name:
XAO PPMXL
Date:
25 Jun 2024 10:32:03
Publisher:
Xinjiang Astronomical Observatory,CAS
Description:
PPMXL is a catalog of positions, proper motions, 2MASS- and optical photometry of 900 million stars and galaxies, aiming to be complete down to about V=20 full-sky. It is the result of a re-reduction of USNO-B1 together with 2MASS to the ICRS as represented by PPMX.
428. PPMX query
ID:
ivo://org.gavo.dc/ppmx/res/ppmx/scs
Title:
PPMX query
Short Name:
ppmx_scs
Date:
27 Dec 2024 08:31:00
Publisher:
The GAVO DC team
Description:
PPM-Extended (PPMX) is a catalogue of 18 088 919 stars on the ICRS system containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system.
429. Precession-nutation procedures (IAU 2006)
ID:
ivo://CDS.VizieR/J/A+A/459/981
Title:
Precession-nutation procedures (IAU 2006)
Short Name:
J/A+A/459/981
Date:
21 Oct 2021
Publisher:
CDS
Description:
The 2006 IAU General Assembly has adopted the P03 model of Capitaine et al. (2003A&A...412..567C) recommended by the WG on precession and the ecliptic (Hilton et al., 2006, Celest. Mech. Dyn. Astron. 94, 351) to replace the IAU 2000 model, which comprised the Lieske et al. (1977A&A....58....1L) model with adjusted rates. Practical implementations of this new "IAU 2006" model are therefore required, involving choices of procedures and algorithms. The purpose of this paper is to recommend IAU 2006 based precession-nutation computing procedures, suitable for different classes of application and achieving high standards of consistency.
430. Precise astrometry with VLBA (VIPS)
ID:
ivo://CDS.VizieR/J/AJ/142/89
Title:
Precise astrometry with VLBA (VIPS)
Short Name:
J/AJ/142/89
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present accurate positions for 857 sources derived from the astrometric analysis of 16 eleven-hour experiments from the Very Long Baseline Array imaging and polarimetry survey at 5GHz (VIPS). Among the observed sources, positions of 430 objects were not previously determined at milliarcsecond-level accuracy. For 95% of the sources the uncertainty of their positions ranges from 0.3 to 0.9mas, with a median value of 0.5mas. This estimate of accuracy is substantiated by the comparison of positions of 386 sources that were previously observed in astrometric programs simultaneously at 2.3/8.6GHz. Surprisingly, the ionosphere contribution to group delay was adequately modeled with the use of the total electron content maps derived from GPS observations and only marginally affected estimates of source coordinates.

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