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Upsilon Andromedae Summary Visual magnitude: 4.10 Distance: 45.1 +/- 1.5 light years Luminosity: 3.55 +/- 0.24 x Sun's luminosity Position information for 01 ene 2000 0:00:00 (Julian day number 2451544.41667) Apparent RA (epoch of date): 01h 36m 47.65s Apparent Dec (epoch of date): +41° 24' 24.4" Constellation: Andromeda Altitude: Azimuth: +58° 35' 49" 285° 48' 4" Rise: Transit: Set: 11h 49m 23s 21h 8m 40s 6h 31m 53s Names and Catalog Numbers Bayer letter: Flamsteed number: Tycho catalog number: PPM number: Henry Draper number: DM number: Andromedae 50 Andromedae TYC 2822-2210-1 PPM 44216 HD 9826 BD +40 0332 Star Atlas Chart Numbers Herald-Bobroff Astroatlas, Chart C-38 Millennium Star Atlas, Charts 101-102 (Vol I) Sky Atlas 2000.0, Chart 4 Uranometria 2000 Chart 61, Vol 1 Tycho Catalog Data Tycho Catalogue (ESA SP-1200, 1997). Tycho Identifier/Proximity Flag Catalog number: TYC 2822-2210-1 Proximity flag: None Descriptor V magnitude: 4.10 Source of V magnitude: Johnson UBV photometric system. Astrometric Data Equatorial coordinates (epoch J2000.0, ICRS) RA: Dec: 01h 36m 47.8439s +41° 24' 19.636" Standard errors of the equatorial coordinates (epoch J1991.25) RA: Dec: 0.0020 arcsec 0.0015 arcsec Astrometric reference flag: This is a recommended astrometric reference star, having good Tycho astrometric quality, and not recognised as double. Trigonometric parallax: 0.07230 arcsec 1 Standard error of the parallax: 0.00250 arcsec Proper motion components (epoch J1991.25, ICRS) RA: Dec: -0.22812 arcsec/yr -0.38290 arcsec/yr Standard errors of the proper motion components RA: Dec: 0.0032 arcsec 0.0015 arcsec Number of accepted data points: 115 Goodness-of-fit parameter, F2: 0.83 Hipparcos catalog number: 7513 Astrometric quality flag: 1 (very high). Signal-to-noise ratio of the star image, Fs: 11.2 Source of astrometric data: Standard data processing. Photometric Data Mean Bt magnitude: 4.748 Standard error: 0.004 Mean Vt magnitude: 4.159 Standard error: 0.003 Source of photometric data: The Bt,Vt data are median values, rather than de-censored mean values (mainly relevant for bright stars with Bt<=8.5 mag and Vt<=8.0 mag). Johnson B-V colour index: 0.541 Standard error: 0.004 Number of transits used in mean photometry: 115 Vt scatter, s: 0.023 mag Vt magnitude at maximum luminosity: 4.13 Vt magnitude at minimum luminosity: 4.18 Previously known or suspected variability: None. Variability of the Tycho measurements: Variability suspected in the Tycho data; this may be due to intrinsic variability since no correlation with position angle was evident. No thorough investigation has been carried out to eliminate other reasons intrinsic to the Tycho measurements. Unresolved duplicity status: An investigation was carried out on the Tycho data, but no indication of duplicity was found. Cross-identification and Notes PPM identifier: PPM 44216 HD identifier: HD 9826 DM identifier: BD +40 0332 2