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HD 38422


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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:05h46m06.22s
Declination:+10°06'07.2"
Apparent magnitude:8.976
Distance:10000000 parsecs
Proper motion RA:-1.6
Proper motion Dec:-2.9
B-T magnitude:9.021
V-T magnitude:8.98

Catalogs and designations:
Proper Names
HD 1989HD 38422
TYCHO-2 2000TYC 719-314-1
USNO-A2.0USNO-A2 0975-01984941
HIPHIP 27217
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