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HD 208744


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Speckle Interferometry at the US Naval Observatory. VIII.
The results of 2044 speckle interferometric observations of doublestars, made with the 26 inch (66 cm) refractor of the US NavalObservatory, are presented. Each speckle interferometric observation ofa system represents a combination of over a thousand short-exposureimages. These observations are averaged into 1399 mean positions andrange in separation from 0.16" to 14.97", with a mean separation of2.51". This is the eighth in a series of papers presenting measuresobtained with this system and covers the period 2001 March 18 through2001 December 30.

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.

Photoelectric photometry of luminous B-type stars in a Milky Way field in Cepheus
Not Available

Mikrometermessungen von Doppelsternen. VI.
Not Available

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
Not Available

Mesures d'étoiles doubles faites à Strasbourg en 1954
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Membro dei seguenti gruppi:

Osservazione e dati astrometrici

Costellazione:Cefeo
Ascensione retta:21h56m27.32s
Declinazione:+59°47'42.5"
Magnitudine apparente:7.194
Distanza:531.915 parsec
Moto proprio RA:21.8
Moto proprio Dec:-2.1
B-T magnitude:7.285
V-T magnitude:7.202

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 208744
TYCHO-2 2000TYC 3980-723-1
USNO-A2.0USNO-A2 1425-12545437
HIPHIP 108301
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