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HD 109400

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Prediction of spectral classification from photometric observations - Application of the UVBY beta photometry and the MK spectra classification. II - General case Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&A....85...93M&db_key=AST
Prediction of spectral classification from photometric observations-application to the UVBY beta photometry and the MK spectral classification. I - Prediction assuming a luminosity class An algorithm based on multiple stepwise and isotonic regressions isdeveloped for the prediction of spectral classification from photometricdata. The prediction assumes a luminosity class with reference touvbybeta photometry and the MK spectral classification. The precisionattained is about 90 percent and 80 percent probability of being withinone spectral subtype respectively for luminosity groups I and V and forluminosity groups III and IV. A list of stars for which discrepanciesappear between photometry and spectral classification is given.
Detection of errors in spectral classification by cluster analysis Cluster analysis methods are applied to the photometric catalogue ofuvby-beta measurements by Hauck and Lindemann (1973) and point out 249stars the spectral type of which should be reconsidered or thephotometric indices of which should be redetermined.
Spectral types and UBV photometry of G-K giants at the north galactic pole Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973AJ.....78...37S&db_key=AST
Interstellar reddening near the north galactic pole Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972PASP...84..497F&db_key=AST
The space distribution of late type stars in a North galactic pole region. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67...37U&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Cani da Caccia
Ascensione retta:	12^h34^m03.41^s
Declinazione:	+46Â°44'51.7"
Magnitudine apparente:	7.299
Distanza:	317.46 parsec
Moto proprio RA:	-54.1
Moto proprio Dec:	-32.1
B-T magnitude:	8.648
V-T magnitude:	7.411

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 109400
TYCHO-2 2000	TYC 3456-1291-1
USNO-A2.0	USNO-A2 1350-08132981
HIP	HIP 61334

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