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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.
| Longterm Photometry of Variables at ESO - Part Two - the Second Data Catalogue 1986-1990
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1993A&AS..102...79S&db_key=AST
| Photometry of R Coronae Borealis and hydrogen-deficient carbon stars, 1982-3
Photoelectric UBVRI and uvby observations are presented for 4hydrogen-deficient carbon stars, 12 known or suspected R CoronaeBorealis stars and the probably related objects DY Cen and MV Sgr.
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Observation and Astrometry data
| Constellation: | Télescope |
| Right ascension: | 18h19m42.45s |
| Declination: | -46°28'24.8" |
| Apparent magnitude: | 8.737 |
| Distance: | 284.091 parsecs |
| Proper motion RA: | 19.5 |
| Proper motion Dec: | -3.5 |
| B-T magnitude: | 9.967 |
| V-T magnitude: | 8.839 |
Catalogs and designations:
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