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A Fast Chi-Squared Technique for Period Search of Irregularly Sampled Data
A new, computationally and statistically efficient algorithm, the Fast?2 algorithm (F?2), can find a periodicsignal with harmonic content in irregularly sampled data with nonuniformerrors. The algorithm calculates the minimized ?2 as afunction of frequency at the desired number of harmonics, using fastFourier transforms to provide O(Nlog N) performance. The code for areference implementation is provided.
| A catalogue of eclipsing variables
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| Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
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| ICCD Speckle Observations of Binary Stars. XIII. Measurements During 1989- 1994 From the Cerro Tololo 4 M Telescope
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..936H&db_key=AST
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Observation and Astrometry data
| Constellation: | Γερανός |
| Right ascension: | 23h25m40.57s |
| Declination: | -42°53'59.3" |
| Apparent magnitude: | 8.302 |
| Distance: | 348.432 parsecs |
| Proper motion RA: | 12.5 |
| Proper motion Dec: | -27.8 |
| B-T magnitude: | 8.868 |
| V-T magnitude: | 8.349 |
Catalogs and designations:
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INHABITED SKY
