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HD 219989 (OT And)


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A catalogue of eclipsing variables
A new catalogue of 6330 eclipsing variable stars is presented. Thecatalogue was developed from the General Catalogue of Variable Stars(GCVS) and its textual remarks by including recently publishedinformation about classification of 843 systems and making correspondingcorrections of GCVS data. The catalogue1 represents thelargest list of eclipsing binaries classified from observations.

OT And - a Long Period EA Binary with Increasing O-C
Results are compared with Crawford, R.C. et al., IBVS 2624 (1984). Thereseems to be indication for increasing O-C. Further observations areencouraged to improve the current elements.

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Not Available

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APT's - Automatic photoelectric telescopes
In an automatic photoelectric telescope (APT), the photometricinstrument with which measurements are made also undertakes theidentification and centering of the stars to be observed. Amicrocomputer operates both the photometer and telescope, and inaddition decides the time and order of observations. APTs are noted toexcell in the detection of variable stars with properties, such as longperiods, which could easily be missed during the shorter observationruns to which human astronomers are accustomed. A detailed account isgiven of an APT's typical operating cycle.

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Not Available

Automatic Photoelectric Telescope: Second and Third Quarter 1984 Observations
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Osservazione e dati astrometrici

Costellazione:Andromeda
Ascensione retta:23h20m01.22s
Declinazione:+41°45'17.5"
Magnitudine apparente:7.353
Distanza:215.983 parsec
Moto proprio RA:32.1
Moto proprio Dec:6.2
B-T magnitude:7.61
V-T magnitude:7.375

Cataloghi e designazioni:
Nomi esattiOT And
  (Edit)
HD 1989HD 219989
TYCHO-2 2000TYC 3238-1651-1
USNO-A2.0USNO-A2 1275-18324622
HIPHIP 115200

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