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HD 38560


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Observations of fuors. FU Orionis during 1984-1990 - Notable variation in the brightness decline rate
Results of FU Ori photometry on Mt. Maidanak during 1984-1990 areanalyzed. In December 1987, the fuor exhibited a stepwise decrease inbrightness by 0.1 mag, after which the decrease rate of FU Oribrightness grew threefold (0.07 mag/yr compared to 0.02 mag/yr during1961-1980), while the U-B color parameter decreased to +0.82 mag. Adistance modulus of 8.1 +/- 0.2 mag is confirmed on the basis ofphotometry of 65 stars in the neighborhood of FU Ori. UBVR magnitudes ofvariable and emission-line stars in the FU Ori field are also presented;brightness variations are suspected for seven stars.

FUOR observations III. FU Orionis during 1984-1990. A remarkable change in the brightness decrease rate.
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Das bisherige Verhalten von FU Orionis. Mit 7 Textabbildungen
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Observation and Astrometry data

Constellation:Ωρίων
Right ascension:05h47m07.18s
Declination:+09°32'06.9"
Apparent magnitude:9.017
Distance:354.61 parsecs
Proper motion RA:-7.8
Proper motion Dec:-1.5
B-T magnitude:9.203
V-T magnitude:9.033

Catalogs and designations:
Proper Names
HD 1989HD 38560
TYCHO-2 2000TYC 719-733-1
USNO-A2.0USNO-A2 0975-02008573
HIPHIP 27306
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