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- ID:
- ivo://fs.usno/cat/nomad
- Title:
- NOMAD Catalogue
- Short Name:
- NOMAD
- Date:
- 11 Apr 2007 08:52:38
- Publisher:
- United States Naval Observatory, Flagstaff Station
- Description:
- The U.S. Naval Observatory (USNO) announces the release of the first version of the Naval Observatory Merged Astrometric Dataset (NOMAD). The 100 GB dataset contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos, Tycho-2, UCAC2, and USNO-B catalogs for astrometry and optical photometry, supplemented by 2MASS near-infrared photometry. For each unique star the "best" astrometric and photometric data are chosen from the source catalogs and merged into a single dataset. A sequence of priorities is followed and NOMAD contains flags to identify the source catalogs and gives cross-reference identifications. This first release of NOMAD is not a compiled catalog; that is, if a star is identified in more than 1 of the above mentioned catalogs, only 1 catalog entry is chosen. Thus the local and global systematic errors of the various source catalogs will be present in this version of NOMAD. All source catalogs astrometric data are on the International Celestial Reference System within the limitations of the source catalogs. For more information and data retrieval see our homepage www.nofs.navy.mil/nomad.
- ID:
- ivo://sdss.jhu/epo/hubblediagram
- Title:
- SkyServer: Hubble Diagram
- Short Name:
- Hubble Diagram
- Date:
- 15 Jun 2007 15:18:48
- Publisher:
- The Sloan Digital Sky Survey
- Description:
- A SkyServer Advanced project, intended for honors high school and college students. Students examine the magnitudes and redshifts of six sample galaxies and create a simple Hubble Diagram showing the expansion of the universe. Then they consider some of the complications involved in making a Hubble Diagram, and look at clusters of galaxies to account for galaxy differences.
- ID:
- ivo://sdss.jhu/epo/oldtimeastronomy
- Title:
- SkyServer: Old Time Astronomy
- Short Name:
- OldTimeAstro
- Date:
- 15 Jun 2007 13:08:58
- Publisher:
- The Sloan Digital Sky Survey
- Description:
- A SkyServer project for 3rd to 8th grade students. Students make pencil drawings of galaxies as seen by the Sloan Digital Sky Survey. They compare their drawings to other students' drawings of the same objects, looking for similarities and differences.
- ID:
- ivo://sdss.jhu/epo/typesofstars
- Title:
- SkyServer: Types of Stars
- Short Name:
- OldTimeAstro
- Date:
- 15 Jun 2007 15:18:30
- Publisher:
- The Sloan Digital Sky Survey
- Description:
- A SkyServer Basic project, intended for middle school and high students. Students look at the spectra of 14 stars and classify them into groups based on common features. They then learn about the OBAFGKM classifcation system that astronomers use, and reclassify the same 14 stars in OBAFGKM categories. Finally, they learn about some stars whose spectra do not fit neatly into the classification scheme, including carbon stars.
- ID:
- ivo://fs.usno/org
- Title:
- United States Naval Observatory, Flagstaff Station
- Short Name:
- USNOFS
- Date:
- 11 Apr 2007 08:52:38
- Publisher:
- US Naval Observatory
- Description:
- The USNO Flagstaff Station Image and Catalogue archive provides access to digitized images of the major Schmidt photographic surveys of the sky (POSS-I, POSS-II, SERC-J, SERC-R, SERC-EJ, SERC-ER, AAO-R etc.) and to astrometric catalogues derived from these data, including USNO-A2, USNO-B1 and NOMAD. The site provides catalogue data, finding charts, image data and a merge of the three.
- ID:
- ivo://fs.usno
- Title:
- United States Naval Observatory, Flagstaff Station Naming Authority
- Short Name:
- USNOFS auth
- Date:
- 11 Apr 2007 08:52:38
- Publisher:
- US Naval Observatory
- Description:
- The USNO Flagstaff Station Image and Catalogue archive provides access to digitized images of the major Schmidt photographic surveys of the sky (POSS-I, POSS-II, SERC-J, SERC-R, SERC-EJ, SERC-ER, AAO-R etc.) and to astrometric catalogues derived from these data, including USNO-A2, USNO-B1 and NOMAD. The site provides catalogue data, finding charts, image data and a merge of the three.
- ID:
- ivo://fs.usno/cat/usnob
- Title:
- USNO-B1 Catalogue
- Short Name:
- USNO-B1
- Date:
- 03 Feb 2020 22:21:11
- Publisher:
- United States Naval Observatory, Flagstaff Station
- Description:
- USNO-B is an all-sky catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,042,618,261 objects derived from 3,643,201,733 separate observations. The data were obtained from scans of 7435 Schmidt plates taken for the various sky surveys during the last 50 years. USNO-B1.0 is believed to provide all-sky coverage, completeness down to V=21, 0.2" astrometric accuracy at J2000, 0.3 mag photometric accuracy in up to five colors, and 85% accuracy for distinguishing stars from nonstellar objects. A brief discussion of various issues is given here, but the actual data are available from the US Naval Observatory Web site and others.
