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HD 231247


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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.

A preliminary compilation of DS-programme star positions
A catalog is presented of the double-star-program (DS-program) starpositions, listing right ascensions for 930 DSs and declinations for1225 DSs of the program. The positions were compiled from the observedvalues obtained between 1980 and 1987 with the meridian circles of sixUSSR observatories (the Moscow, Kazan', Kiev, Khar'kov, Odessa, andTashkent Observatories) and the Belgrade Observatory. The measurementsand the treatment of the observational material were performed using therelative method, and the FK-4 system stars were used as reference stars.

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Osservazione e dati astrometrici

Costellazione:Freccia
Ascensione retta:19h22m12.87s
Declinazione:+16°39'45.0"
Magnitudine apparente:8.883
Distanza:540.541 parsec
Moto proprio RA:-2
Moto proprio Dec:0.5
B-T magnitude:9.252
V-T magnitude:8.914

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 231247
TYCHO-2 2000TYC 1600-55-1
USNO-A2.0USNO-A2 1050-13709742
HIPHIP 95214

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