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501. 1997-2000 Saturn's satellites astrometry
ID:
ivo://CDS.VizieR/J/A+A/422/377
Title:
1997-2000 Saturn's satellites astrometry
Short Name:
J/A+A/422/377
Date:
21 Oct 2021
Publisher:
CDS
Description:
The raw measured pixel coordinates of the major Saturnian satellites obtained using a CCD camera on the 1.56m reflector at the Sheshan station during the period 1997-2000. For each CCD frame JD and decimal fractions of the middle of the exposures are given in universal Time. Satellite numbers conform to IAU numbering system.
502. Saturn's satellites in 1995/97
ID:
ivo://CDS.VizieR/J/A+AS/136/257
Title:
Saturn's satellites in 1995/97
Short Name:
J/A+AS/136/257
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this paper, we publish measurements of 1514 positions of the major satellites of Saturn made in 1995 and 1997 using CCD detectors attached to the 1-metre Jacobus Kapteyn Telescope on the island of La Palma. Analysis of the data as inter-satellite positions shows that the observations of Tethys, Dione, Rhea and Titan have root-mean-square residuals of 0.08 arc-seconds in 1995 and 0.10 arc-seconds in 1997.
503. SDSS DR7 PhotoObjAll
ID:
ivo://org.gavo.dc/sdssdr7/q/sources
Title:
SDSS DR7 PhotoObjAll
Short Name:
sdssdr7.sources
Date:
27 Dec 2024 08:31:01
Publisher:
The GAVO DC team
Description:
This is the result of the query:: select objID, field.run, field.rerun, field.camcol, field.fieldId, obj, ra, dec, raErr, decErr, raDecCorr, offsetRa_u, offsetRa_g, offsetRa_r, offsetRa_i, offsetRa_z, offsetDec_u, offsetDec_g, offsetDec_r, offsetDec_i, offsetDec_z, u, g, r, i, z, err_u, err_g, err_r, err_i, err_z, mjd_u, mjd_g, mjd_r, mjd_i, mjd_z from PhotoObjAll join field on (field.fieldId=PhotoObjAll.fieldId) on SDSS DR7, kindly provided by the Potsdam mirror. All angular quantities are given in degrees here.
504. Search for UMa group companions
ID:
ivo://CDS.VizieR/J/A+A/591/A84
Title:
Search for UMa group companions
Short Name:
J/A+A/591/A84
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a survey to detect low-mass companions of Ursa Major (UMa) group members, carried out in 2003-2006 with NACO at the ESO VLT. While many extra-solar planets and planetary candidates have been found in close orbits around stars by the radial velocity and the transit methods, direct detections at wider orbits are rare. The UMa group, a young nearby stellar association at an age of about 200-600Myr, has not yet been addressed as a whole although its members represent a very interesting sample to search for and characterize substellar companions by direct imaging. Our goal was to find or to provide detection limits on wide substellar companions around nearby UMa group members using high-resolution imaging. We searched for faint companions around 20 UMa group members within 30pc. The primaries were placed below a semi-transparent coronagraph, a rarely used mode of NACO, to increase the dynamic range of the images. In most cases, second epoch images of companion candidates were taken to check whether they share common proper motion with the primary.
505. Second Cape Photographic Catalogue (CPC2)
ID:
ivo://CDS.VizieR/I/265
Title:
Second Cape Photographic Catalogue (CPC2)
Short Name:
I/265
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Second Cape Photographic Catalogue (CPC2) is an astrometric, photographic catalog covering the entire Southern Hemisphere to a limiting magnitude of about 10.5. The Hipparcos Catalogue has been used for a new, plate-by-plate, rigorous reduction. A significant improvement over the release 1 version of the data was achieved. With an average accuracy of 53 mas and a mean epoch of 1968, the CPC2 is a key catalog for proper-motion determination. This release 2 of the CPC2 contains high-quality positions of 266629 stars and an appendix of 8040 other stars. Catalog reduction and construction details are given, as well as a description of the final product, which is available from the US Naval Observatory.
506. Second Cat of Fundamental Stars (SPF2)
ID:
ivo://CDS.VizieR/I/44
Title:
Second Cat of Fundamental Stars (SPF2)
Short Name:
I/44
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Catalogue SPF2 was obtained from observations of the fundamental FK4 stars as a reference stars for SRS, BS and DS star. Observations were made by Pulkovo observers in the declination zone -42 to -90 and +16 to -16 degrees using Repsold Meridian Circle of the Cerro Calan Observatory (Santiago, Chile) from 1963 to 1968.
507. Second Greenwich Catalog of Stars for 1925.0
ID:
ivo://CDS.VizieR/I/34
Title:
Second Greenwich Catalog of Stars for 1925.0
Short Name:
I/34
Date:
21 Oct 2021
Publisher:
CDS
Description:
The observations for these two catalogs were made with the transit circle at the Royal Observatory in Greenwich, England, between the years 1922 and 1930 under the direction of Sir Frank Dyson, Astronomer Royal. Part I contains fundamental stars contained in the annual volumes of Greenwich Observations of the Sun, Moon and Planets. In addition, 232 stars observed at the prime vertical, South of +32dDec., have been observed. Part II contains all stars down to 7.9 mag in the A.G. scale between the limits of 32d and 64d Dec with the addition of 285 fainter stars in the sparse region of the sky from 12h to 16h RA. From internal information, the probable error of one observation of a star is found to be +/-0.35 arcsec in RA and +/-0.28 arcsec in DE. As the number of observations is generally 5, the pe of a position in the catalog, apart from systematic errors, should be +/-0.15 arcsec. In determining the proper motion of the fundamental stars, the positions of this catalogue were combined with the First Greenwich Catalog of Stars for 1925.0 (Observed 1915-1921), the two Pulkova Catalogues and the two Cape Catalogues preceding this catalogue. Note that the problable errors on the proper motions are not included in this electronic version.
508. Second VLBA calibrator survey: VCS2
ID:
ivo://CDS.VizieR/J/AJ/126/2562
Title:
Second VLBA calibrator survey: VCS2
Short Name:
J/AJ/126/2562
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper presents an extension of the Very Long Baseline Array Calibrator Survey, called VCS2, containing 276 sources. This survey fills in regions of the sky that were not completely covered by the previous VCS1 calibrator survey. The VCS2 survey includes calibrator sources near the Galactic plane, -30{deg}<DE<-45{deg}, and VLA calibrators. The positions have been derived from astrometric analysis of the group delays measured at 2.3 and 8.4 GHz using the Goddard Space Flight Center CALC/SOLVE package. From the VLBA snapshot observations, images of the calibrators are available, and each source is given a quality code for anticipated use. The VCS2 catalog is available from the NRAO Web site.
509. SgrA* orbital motions with GRAVITY
ID:
ivo://CDS.VizieR/J/A+A/618/L10
Title:
SgrA* orbital motions with GRAVITY
Short Name:
J/A+A/618/L10
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states ('flares') of its variable near- infrared emission with the near-infrared GRAVITY-Very Large Telescope Interferometer (VLTI) beam-combining instrument. In three prominent bright flares, the position centroids exhibit clockwise looped motion on the sky, on scales of typically 150 micro-arcseconds over a few tens of minutes, corresponding to about 30% the speed of light. At the same time, the flares exhibit continuous rotation of the polarization angle, with about the same 45(+/-15)-minute period as that of the centroid motions. Modelling with relativistic ray tracing shows that these findings are all consistent with a near face-on, circular orbit of a compact polarized 'hot spot' of infrared synchrotron emission at approximately six to ten times the gravitational radius of a black hole of 4 million solar masses. This corresponds to the region just outside the innermost, stable, prograde circular orbit (ISCO) of a Schwarzschild-Kerr black hole, or near the retrograde ISCO of a highly spun-up Kerr hole. The polarization signature is consistent with orbital motion in a strong poloidal magnetic field.
510. Short- and long-term pm of close dwarfs
ID:
ivo://CDS.VizieR/J/PAZh/41/896
Title:
Short- and long-term pm of close dwarfs
Short Name:
J/PAZh/41/896
Date:
21 Oct 2021
Publisher:
CDS
Description:
Motions of 1308 stars with large proper motions ({mu}>300mas/yr) up to 17 mag were investigated using the results of observations conducted with Pulkovo Normal Astrograph and images taken from data bases of sky surveys (DSS, SDSS DR12, WISE). Basic idea of search of double stars with this material is a comparison between long-term proper motion (POSS2-POSS1, epoch difference is about 50yr) and short-term proper motion (2MASS, SDSS, WISE, Pulkovo, epoch difference is about 10yr). Star is classified as delta-mu-binary candidate in the case of statistically significant difference of short-term and long-term proper motions. This condition is realised for 121 stars of our target list. Additional evidence of duplicity was obtained with comparison of our proper motions with data of several parallax determination programs. Analysis of accurate SDSS photometric values of our stars allows us to conclude that four stars (J0656+3827, J0838+3940, J1229+5332, J2330+4639) are probably binary systems which consist of wite dwarf + M-dwarf.

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