A5057594325- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Historical Astronomy and Related Studies
- Geophysics and Gravity Measurements
- Historical Geography and Cartography
- Adaptive optics and wavefront sensing
- Inertial Sensor and Navigation
- Astro and Planetary Science
- GNSS positioning and interference
- Historical and Architectural Studies
- Management and Organizational Practices
- Astrophysics and Star Formation Studies
- Experimental Learning in Engineering
- Medical Imaging Techniques and Applications
- Spacecraft Design and Technology
- Astronomical and nuclear sciences
- Oceanographic and Atmospheric Processes
- Solar and Space Plasma Dynamics
- Optical Polarization and Ellipsometry
- Astrophysical Phenomena and Observations
- Economic and Fiscal Studies
- Gamma-ray bursts and supernovae
United States Naval Observatory
1996-2018
Czech Academy of Sciences, Astronomical Institute
2015
Jet Propulsion Laboratory
2005-2008
California Institute of Technology
2005-2008
National Astronomical Observatory of Japan
2008
Arizona State University
2002
United States Naval Research Laboratory
2000
Universities Space Research Association
1998
United States Navy
1988-1990
The second US Naval Observatory (USNO) CCD Astrograph Catalog, UCAC2 was released in 2003 July. Positions and proper motions for 48,330,571 sources (mostly stars) are available on 3 CDs, supplemented with Two Micron All Sky Survey photometry 99.5% of the sources. catalog covers sky area from -90° to +40° declination, going up +52° some areas; this completely supersedes UCAC1 2001. Current epoch positions obtained observations USNO 8 inch (0.2 m) Twin equipped a 4K camera. precision 15–70...
The third US Naval Observatory (USNO) CCD Astrograph Catalog, UCAC3 was released at the IAU General Assembly on 2009 August 10. It is first all-sky release in this series and contains just over 100 million objects, about 95 of them with proper motions, covering R = 8 to 16 magnitudes. Current epoch positions are obtained from observations 20 cm aperture USNO Astrograph's "red lens", equipped a 4k by CCD. Proper motions derived combining these 140 ground- space-based catalogs, including...
We report the discovery of visual double stars, mostly with separations between 0.3 and 1 arcsec, from a dedicated re–reduction Tycho data star mapper ESA Hipparcos satellite. The new doubles are combined WDS systems identified in Catalogue, 1220 doubles, to form Double Star TDSC, catalogue absolute astrometry BT, VT photometry for components multiple systems. also include results single unresolved supplement gives 4777 additional components. TDSC thus contains total entries. Cross...
The USNO CCD Astrograph (UCA) started an astrometric survey in 1998 February at Cerro Tololo, Chile. This first, preliminary catalog (UCAC1) includes data taken up to 1999 November with about 80% of the Southern Hemisphere covered. Observing continues, and full sky coverage is expected by mid-2003 after moving instrument a Northern site early 2001. performed single bandpass (579–642 nm), twofold overlap pattern fields, long short exposure on each field. Stars magnitude range 10–14 have...
The US Naval Observatory has completed the compilation of ACT Reference Catalog, containing 988,758 stars covering entire sky. motivation behind was to provide accurate proper motions for majority in Tycho Catalogue. To do this, positions from new reductions Astrographic Catalogue (AC 2000) were combined with those large epoch span between two catalogs yields about an order magnitude more than found astrometric data contained Catalog include and their corresponding errors. These are on...
The AC 2000 is a positional catalog of 4,621,836 stars covering the entire sky. average epoch position 1907. data are from images measured and published as part Astrographic Catalogue (AC). positions on system defined by Hipparcos Catalogue, having originally been reduced plate-by-plate using Catalog Reference Stars. In addition to astrometric data, magnitudes (on Tycho B system) cross-referencing information included. These valuable for computation proper motions, were combined with...
We describe an Internet-based signal processing laboratory that provides hands-on learning experiences in distributed environments. The is based on object-oriented Java/sup TM/ tool called Java Digital Signal Processing (J-DSP). J-DSP has been developed at Arizona State University (ASU) and being used for a virtual senior-level DSP course. written as platform-independent applet resides the Web thereby accessible by all students through use of browser. rich suite functions facilitate...
The results of 3047 speckle interferometric observations double stars, made with the 26 inch (66 cm) refractor US Naval Observatory, are presented. Each observation a system represents combination over thousand short-exposure images. These averaged into 1572 mean relative positions and range in separation from 020 to 6286, median 419. This is 10th series papers presenting measures obtained this covers period 2003 January 13 through December 1. Included these data nine older whose were...
The results of 3056 speckle interferometric observations double stars, made with the 26 inch (66 cm) refractor US Naval Observatory, are presented. Each observation a system represents combination over thousand short-exposure images. These averaged into 1675 mean relative positions and range in separation from 019 to 4521, median 299. This is ninth series papers presenting measures obtained this covers period 2002 January 1 through December 29. Included these data 28 older whose were...
Accurate two-colour photometry and proper motions of 7096 young X-ray stars in the ROSAT All-Sky Survey Bright Star Catalogue, version 1RXS, are extracted from Tycho-2 Catalogue. The sample is dominated by red main-sequence possibly pre-main-sequence stars. On a global motion convergence map, two features very prominent: nearby section Gould Belt Hyades convergent point. appearance feature with its peak at (l=244.°3, b=−12.°6) quite similar to that Hipparcos OB When only drawing close point...
The results of 2044 speckle interferometric observations double stars, made with the 26 inch (66 cm) refractor US Naval Observatory, are presented. Each observation a system represents combination over thousand short-exposure images. These averaged into 1399 mean positions and range in separation from 016 to 1497, 251. This is eighth series papers presenting measures obtained this covers period 2001 March 18 through December 30.
The US Naval Observatory has mined over 140 astrometric catalogs, including the Astrographic Catalogue and Two Micron All Sky Survey, for measures of double stars. This resulted in 114,218 new 47,007 different systems spanning 110 years; these are now included Washington Double Star catalog (WDS). is single largest data set ever added to WDS. typically wider pairs, most between 4'' 30''; thus, their value aiding orbit determination limited. However, they have proven invaluable verification...
The Tycho-2 Catalogue, released in February 2000, is based on the ESA Hipparcos space mission data and various ground-based catalogs for proper motions. An external comparison of astrometry presented here using first US Naval Observatory CCD Astrograph Catalog (UCAC1). UCAC1 were obtained from observations performed at Cerro Tololo Inter-American (CTIO) between 1998 1999 November, 206 mm–aperture five-element lens astrograph a 4K × CCD. Only small systematic differences position UCAC1, up to...
The recently released Tycho-2 Catalogue is expected to supersede the currently used catalogs based on Tycho data, specifically, ACT Reference Catalog and Catalogue. Here proper motions of newly are compared with those Hipparcos Catalog. found be consistent at a level below 0.5 mas yr-1. Comparisons reveal differences in systematic errors between two, most likely due 1997 reduction Astrographic This comparison shows that follows system better than 1.0 yr-1, but an improvement. Some largest...
Two hundred thirty nearby main-sequence stars with spectral types in the range of A to G have been observed by way speckle interferometry using WIYN 3.5 m telescope at Kitt Peak, Arizona. The had no previous mention duplicity literature. Of those observed, 14 showed clear evidence a companion, and 63 were classified as suspected nonsingle based on power spectrum analysis. remaining discussed show limit detection system high-quality observations.
The results of 1068 speckle interferometric observations double stars, made with the 26 inch (0.66 m) refractor US Naval Observatory, are presented. These averaged into 841 means 815 binary stars. systems range in separation from 022 to 601 a mean 221 and have limiting secondary magnitude V = 12.5. This is sixth series papers presenting measures obtained this system, it covers period 1999 January 1 through 2000 9.
The Tycho-2 Catalogue provides astrometric and photometric information for 2.5 million stars. Within the Catalogue, while there is no separate listing of double-star parameters, a wealth data. For all measured systems, each component has its own entry in (this corresponds to Hipparcos "double-entry systems"), classical parameters separation, position angle, magnitude difference can be calculated these systems. Most double stars are identified by code indicating double, failed or photocentric...
The results of 2014 speckle interferometric observations double stars, made with the 26 inch (66 cm) refractor US Naval Observatory, are presented. These averaged into 1266 mean positions and range in separation from 021 to 1341, a 261. This is seventh series papers presenting measures obtained this system covers period 2000 January 10 through December 8.