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HD 198178


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UBV(RI)c Photometry of the Rapidly Rotating K-Type Star HD197890 = "Speedy Mic"
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Speedy MIC - A very young, rapidly rotating K star
The active K-type object HD 197890 detected in the ROSAT all-sky surveyappears to be one of the most rapidly rotating stars of its type yetfound, with a v sin i value of 170 +/- 20 km/s. Preliminary photometricmeasurements and spectral synthesis of the Li 6707-A spectral regionsuggest a premain-sequence evolutionary status, although the derivedspectral type of approximately K5 is uncertain at this stage, andfurther observations are planned.

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Observation and Astrometry data

Constellation:Microscopium
Right ascension:20h49m48.00s
Declination:-36°51'18.2"
Apparent magnitude:7.964
Distance:190.476 parsecs
Proper motion RA:22.2
Proper motion Dec:-5.8
B-T magnitude:9.289
V-T magnitude:8.074

Catalogs and designations:
Proper Names
HD 1989HD 198178
TYCHO-2 2000TYC 7469-1431-1
USNO-A2.0USNO-A2 0525-42839442
HIPHIP 102818
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