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HD 246803


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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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Observation and Astrometry data

Constellation:Orion
Right ascension:05h43m11.27s
Declination:+08°09'46.2"
Apparent magnitude:9.792
Proper motion RA:6.4
Proper motion Dec:-8.4
B-T magnitude:10.027
V-T magnitude:9.812

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 246803
TYCHO-2 2000TYC 714-1216-1
USNO-A2.0USNO-A2 0975-01915478
HIPHIP 26954
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