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HD 192689

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Variable stars in the Tycho photometric observations. I. Detection We present an original way to detect variable stars in the Tychophotometric observations. A modified Kolmogorov-Smirnov statistical testhas been constructed, based on a model of most of the satellite'sparameters, leading to the dispersion in the measurements. This allowsus to build a treatment taking into account truncated detections andcensored measurements, and to search for variability in the faint partof the catalogue. The selection threshold of variable stars has beencalibrated to minimize false alarm rate. Reliable results were thusobtained for stars as faint as 11 mag. One thousand and ninety-onesuspected variable stars have been listed, 407 of which are alreadyknown in Hipparcos, GCVS or NSV, and 684 of which are suspected variablestars to be identified soon.
On Identifications of New Variable Stars Announced by Woitas Confusion in the positions of variable stars announced in IBVS No. 4444has been clarified.
Classification and Identification of IRAS Sources with Low-Resolution Spectra IRAS low-resolution spectra were extracted for 11,224 IRAS sources.These spectra were classified into astrophysical classes, based on thepresence of emission and absorption features and on the shape of thecontinuum. Counterparts of these IRAS sources in existing optical andinfrared catalogs are identified, and their optical spectral types arelisted if they are known. The correlations between thephotospheric/optical and circumstellar/infrared classification arediscussed.
Detection of 43 New Bright Variable Stars by the TYCHO Instrument of the HIPPARCOS Satellite Not Available
IRAS catalogues and atlases - Atlas of low-resolution spectra Plots of all 5425 spectra in the IRAS catalogue of low-resolutionspectra are presented. The catalogue contains the average spectra ofmost IRAS poiont sources with 12 micron flux densities above 10 Jy.
Classification of 831 two-micron sky survey sources south of +5 degrees. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80.1011H&db_key=AST

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Pozíciós és asztrometriai adatok

Csillagkép:	Vízöntő
Rektaszcenzió:	20^h15^m53.57^s
Deklináció:	+07Â°40'13.3"
Vizuális fényesség:	8.117
RA sajátmozgás:	-1
Dec sajátmozgás:	-0.6
B-T magnitude:	9.791
V-T magnitude:	8.256

Katalógusok és elnevezések:

Megfelelő nevek	(Edit)
HD 1989	HD 192689
TYCHO-2 2000	TYC 1073-1391-1
USNO-A2.0	USNO-A2 0975-18453292

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