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1721. SKY2000 - Master Star Catalog, Version 2
ID:
ivo://CDS.VizieR/V/102
Title:
SKY2000 - Master Star Catalog, Version 2
Short Name:
V/102
Date:
21 Oct 2021
Publisher:
CDS
Description:
The SKYMAP Star Catalog System consists of a Master Catalog stellar database and a collection of utility software designed to create and maintain the database and to generate derivative mission star catalogs (run catalogs). It contains an extensive compilation of information on almost 300000 stars brighter than 8.0 mag.
1722. SkyView Virtual Observatory
ID:
ivo://nasa.heasarc/skyview/skyview
Title:
SkyView Virtual Observatory
Short Name:
SkyView
Date:
06 Apr 2021
Publisher:
NASA/GSFC HEASARC
Description:
SkyView is a Virtual Observatory on the Net. Astronomers can generate images of any portion of the sky at wavelengths in all regimes from radio to gamma-ray. Users tell SkyView the position, scale and orientation desired, and SkyView gives users an image made to their specification. The user need not worry about transforming between equinoxes or coordinate systesm, mosaicking submaps, rotating the image,.... SkyView handles these geometric issues and lets the user get started on astronomy.
1723. Sloan Digital Sky Survey coadd. Stripe 82
ID:
ivo://CDS.VizieR/J/ApJ/794/120
Title:
Sloan Digital Sky Survey coadd. Stripe 82
Short Name:
J/ApJ/794/120
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present details of the construction and characterization of the coaddition of the Sloan Digital Sky Survey (SDSS) Stripe 82 ugriz imaging data. This survey consists of 275 deg^2^ of repeated scanning by the SDSS camera over -50{deg}<={alpha}<=60{deg} and -1.25{deg}<={delta}<= +1.25{deg} centered on the Celestial Equator. Each piece of sky has ~20 runs contributing and thus reaches ~2mag fainter than the SDSS single pass data, i.e., to r~23.5 for galaxies. We discuss the image processing of the coaddition, the modeling of the point-spread function (PSF), the calibration, and the production of standard SDSS catalogs. The data have an r-band median seeing of 1.1'' and are calibrated to <=1%. Star color-color, number counts, and PSF size versus modeled size plots show that the modeling of the PSF is good enough for precision five-band photometry. Structure in the PSF model versus magnitude plot indicates minor PSF modeling errors, leading to misclassification of stars as galaxies, as verified using VVDS spectroscopy. There are a variety of uses for this wide-angle deep imaging data, including galactic structure, photometric redshift computation, cluster finding and cross wavelength measurements, weak lensing cluster mass calibrations, and cosmic shear measurements.
1724. Sloan Digital Sky Survey g-band
ID:
ivo://nasa.heasarc/skyview/sdss
Title:
Sloan Digital Sky Survey g-band
Short Name:
SDSS
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Sloan Digital Sky Survey is the deepest large scale survey of the sky currently available. SkyView dynamically queries the SDSS archive (current release DR16) to retrieve data and resample it into the user requested frame. All releases after DR9 are spectra only, so all imaging data originates from DR9. Further information about SDSS and many additional services are available at the <a href="https://www.sdss.org">SDSS website</a>. Provenance: Sloan Digital Sky Survey Team. This is a service of NASA HEASARC.
1725. Sloan Digital Sky Survey g-band DR7
ID:
ivo://nasa.heasarc/skyview/sdssdr7
Title:
Sloan Digital Sky Survey g-band DR7
Short Name:
SDSSDR7
Date:
04 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Sloan Digital Sky Survey is the deepest large scale survey of the sky currently available. SkyView dynamically queries the SDSS archive to retrieve information and resample it into the user requested frame. Further information on the SDSS and many additional services are available at the <a href="https://www.sdss.org/">SDSS website</a>. Provenance: Sloan Digital Sky Survey Team. This is a service of NASA HEASARC.
1726. Sloan Digital Sky Survey-II Supernova Survey
ID:
ivo://CDS.VizieR/II/333
Title:
Sloan Digital Sky Survey-II Supernova Survey
Short Name:
II/333
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper describes the data release of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves, spectra, classifications, and ancillary data are presented for 10,258 variable and transient sources discovered through repeat ugriz imaging of SDSS Stripe 82, a 300deg^2^ area along the celestial equator. This data release is comprised of all transient sources brighter than r~=22.5mag with no history of variability prior to 2004. Dedicated spectroscopic observations were performed on a subset of 889 transients, as well as spectra for thousands of transient host galaxies using the SDSS-III BOSS spectrographs. Photometric classifications are provided for the candidates with good multi-color light curves that were not observed spectroscopically. From these observations, 4607 transients are either spectroscopically confirmed, or likely to be, supernovae, making this the largest sample of supernova candidates ever compiled. We present a new method for SN host-galaxy identification and derive host-galaxy properties including stellar masses, star-formation rates, and the average stellar population ages from our SDSS multi-band photometry. We derive SALT2 distance moduli for a total of 1443 SN Ia with spectroscopic redshifts as well as photometric redshifts for a further 677 purely-photometric SN Ia candidates. Using the spectroscopically confirmed subset of the three-year SDSS-II SN Ia sample and assuming a flat {LAMBDA}CDM cosmology, we determine {OMETA}_M_=0.315+/-0.093 (statistical error only) and detect a non-zero cosmological constant at 5.7{sigma}.
1727. Sloan Digital Sky Survey-II supernova survey
ID:
ivo://CDS.VizieR/J/AJ/135/1766
Title:
Sloan Digital Sky Survey-II supernova survey
Short Name:
J/AJ/135/1766
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper presents spectroscopy of supernovae (SNe) discovered in the first season of the Sloan Digital Sky Survey-II SN Survey. This program searches for and measures multi-band light curves of SNe in the redshift range z=0.05-0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better characterize the SN population, with a particular focus on SNe Ia, improving their utility as cosmological distance indicators and as probes of dark energy. Our SN spectroscopy program features rapid-response observations using telescopes of a range of apertures, and provides confirmation of the SN and host-galaxy types as well as precise redshifts. We describe here the target identification and prioritization, data reduction, redshift measurement, and classification of 129 SNe Ia, 16 spectroscopically probable SNe Ia, 7 SNe Ib/c, and 11 SNe II from the first season. We also describe our efforts to measure and remove the substantial host-galaxy contamination existing in the majority of our SN spectra.
1728. Sloan Digital Sky Survey quasar photometry
ID:
ivo://CDS.VizieR/J/AJ/121/2308
Title:
Sloan Digital Sky Survey quasar photometry
Short Name:
J/AJ/121/2308
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present an empirical investigation of the colors of quasars in the Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 quasars with SDSS photometry: 1759 quasars found during SDSS spectroscopic commissioning and SDSS follow-up observations on other telescopes, 50 matches to FIRST quasars, 573 matches to quasars from the NASA Extragalactic Database, and 243 quasars from two or more of these sources. The quasars are distributed in a 2.5{deg} wide stripe centered on the celestial equator covering ~529deg^2^. Positions (accurate to 0.2") and SDSS magnitudes are given for the 898 quasars known prior to SDSS spectroscopic commissioning.
1729. Sloan Digital Sky Surveys (SDSS), Release 16 (DR16)
ID:
ivo://CDS.VizieR/V/154
Title:
Sloan Digital Sky Surveys (SDSS), Release 16 (DR16)
Short Name:
V/154
Date:
25 Feb 2022 11:21:42
Publisher:
CDS
Description:
This paper documents the 16th data release (DR16) from the Sloan Digital Sky Surveys (SDSS), the fourth and penultimate from the fourth phase (SDSS-IV). This is the first release of data from the Southern Hemisphere survey of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new data from APOGEE-2 North are also included. DR16 is also notable as the final data release for the main cosmological program of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and all raw and reduced spectra from that project are released here. DR16 also includes all the data from the Time Domain Spectroscopic Survey and new data from the SPectroscopic IDentification of ERosita Survey programs, both of which were co-observed on eBOSS plates. DR16 has no new data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey (or the MaNGA Stellar Library "MaStar").
1730. Small-diameter radiosources catalogue
ID:
ivo://CDS.VizieR/J/ApJS/74/181
Title:
Small-diameter radiosources catalogue
Short Name:
J/ApJS/74/181
Date:
21 Oct 2021
Publisher:
CDS
Description:
A survey of the Galactic plane in the longitude range -20deg=<l<=120deg for Galactic latitudes |b|=<0.8deg has been carried out at 1400MHz using the VLA in the B configuration. We present here a catalog of the 1992 discrete sources detected in this survey which is ~75% complete to a limiting peak flux density of 25mJy for sources smaller than ~20" in diameter, although sources as faint as 8mJy and as large as 90" are also included. The catalog includes for each entry a position accurate to ~<3", peak and integrated flux densities, source extent, and information on counterparts both from earlier radio surveys of the plane (for which a comprehensive bibliography is included) and from the IRAS point source catalog. An extensive analysis of the integrity and completeness of the survey is presented here: in separate publications, we discuss the source content of the survey as derived from statistical analysis of the spatial distribution of the sources and from radio, optical and infrared follow up observations .

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