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HD 4806


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Intermediate-Brightness Spectrophotometric Standards. Standards Near +40° Declination
The second stage in our program to compile a list of regionalintermediate-brightness spectrophotometric standards has been completed.We have obtained spectral energy distributions for 24 stars withmagnitudes near +40° declination. The range λλ31007600 Å was studied with a spectral resolution of 50 Å. Therelative rms error of our results in the visible is 1 2%, increasing to3 5% toward the edges of the studied wavelength interval. All the starsare referenced to a single standard, the circumpolar star HD 221525. Theenergy distributions were used to compute color indices in the UBV,WBVR, and UPXY ZV S systems, as well as in the system of the TYCHOcatalog. The computed and observed values for stars in common with theTYCHO catalog are compared.

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Observation and Astrometry data

Constellation:アンドロメダ座
Right ascension:00h50m26.60s
Declination:+40°48'29.7"
Apparent magnitude:8.131
Distance:680.272 parsecs
Proper motion RA:7
Proper motion Dec:-3
B-T magnitude:8.093
V-T magnitude:8.128

Catalogs and designations:
Proper Names
HD 1989HD 4806
TYCHO-2 2000TYC 2802-365-1
USNO-A2.0USNO-A2 1275-00503028
HIPHIP 3928

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