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HD 28098


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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.

Observational studies of Cepheids. II - BVRI photometry of 112 Cepheids
Over 4000 differentially determined photoelectric BVRI observations andthe resulting light curves are presented for 112 Cepheids accessiblefrom Northern Hemisphere observatories. The internal precision of thesedata is better than + or - 0.01 mag, and the accuracy of transformationto the Johnson BVRI system is nearly as good.

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Osservazione e dati astrometrici

Costellazione:Perseo
Ascensione retta:04h28m22.97s
Declinazione:+49°13'53.7"
Magnitudine apparente:8.249
Distanza:178.571 parsec
Moto proprio RA:28
Moto proprio Dec:-25.2
B-T magnitude:10.049
V-T magnitude:8.398

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 28098
TYCHO-2 2000TYC 3337-2043-1
USNO-A2.0USNO-A2 1350-04608236
HIPHIP 20872

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