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HD 88193


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Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog
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Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry
Within the framework of a large photometric observing program, designedto investigate the Galaxy's structure and evolution, Hβ photometryis being made for about 9000 stars. As a by-product, supplementary uvbyphotometry has been made. The results are presented in a cataloguecontaining 6924 uvby observations of 6190 stars, all south ofδ=+38deg. The overall internal rms errors of one observation(transformed to the standard system) of a program star in the interval6.5

The angular diameter of Regulus from the 28 March 1980 CTIO occultation
On 28 March 1980 an occultation of Regulus (= alpha Leo) was observed intwo colors from Cerro Tololo Inter-American Observatory. The best-fituniform disk angular diameters (in milliarcseconds) derived from thesedata are 1.32 + or - 0.2 (yellow channel, lambda = 5768 A) and 1.37 + or- 0.11 (blue channel, lambda = 4356 A), in excellent agreement with themeasurement obtained through intensity interferometry and in reasonableagreement with a daytime occultation observed at Kitt Peak NationalObservatory.

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Osservazione e dati astrometrici

Costellazione:Leone
Ascensione retta:10h10m27.42s
Declinazione:+11°34'32.4"
Magnitudine apparente:8.388
Moto proprio RA:-152.7
Moto proprio Dec:-138.4
B-T magnitude:9.288
V-T magnitude:8.463

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 88193
TYCHO-2 2000TYC 833-1136-1
USNO-A2.0USNO-A2 0975-06430205

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