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HD 221684


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Some enigmatic binary stars. I
Historical measurements of components of binary star systems at timesexhibit evidence for incompatible interpretations. A short period andstrong eccentricity can equally be a long period with feebleeccentricity. Furthermore, measurements have been made indicating bothdirect and retrograde motions of the components. It has sometimes beenfound that the observations of contradicting evidence have been made ofa second binary system near the system first measured. Note is taken ofthe objects ADS 1959 - A 1818, ADS 2051 - HU 539, ADS 5515 - A 512, ADS5671 - BU 1022, ADS 6001 - A 1963, and ADS 7550 - A 2561, which maypossibly be combinations of two or even three binary clusters observedat different times. Tables are presented of data thus far measured ofeach system.

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Osservazione e dati astrometrici

Costellazione:Pesci
Ascensione retta:23h34m14.43s
Declinazione:+02°18'05.5"
Magnitudine apparente:9.46
Moto proprio RA:81.7
Moto proprio Dec:-18.2
B-T magnitude:10.377
V-T magnitude:9.536

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 221684
TYCHO-2 2000TYC 585-48-1
USNO-A2.0USNO-A2 0900-20437822

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