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HD 73178


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The Sirius supercluster in the FK5
Fifty-five stars in the FK5 or with PPM(H) quality proper motions arediscussed as members of the Sirius supercluster. The convergent point ofthe supercluster motion is (A, D) = (20.55h -38.1 deg) and the spacevelocity is V(T) = 18.6 + 0.005X km/s, where X is the radial distance ofthe members from the sun. The member stars indicate (Fe/H) Hyades -(Fe/H) Sirius = 0.18 dex from both photometric and spectroscopicevidence. The bulk of the supercluster members fall into two age groups,6.3 x 10 exp 8 and 10 exp 9 yr on the basis of models with convectiveovershoot. The available observations of chromospheric activity in Mg II(h and k) are quantized into three well-defined groups for both Siriussupercluster and Hyades cluster dwarfs. For 20 supercluster members withcluster parallax greater than 0.03 arcsec the ratio ofpi(cluster)/pi(trigonometric) = 0.95 +/- 0.20(sigma).

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Observation and Astrometry data

Constellation:Wasserschlange
Right ascension:08h36m39.56s
Declination:-09°42'51.2"
Apparent magnitude:7.483
Distance:310.559 parsecs
Proper motion RA:-6.1
Proper motion Dec:-4.5
B-T magnitude:8.943
V-T magnitude:7.604

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 73178
TYCHO-2 2000TYC 5433-747-1
USNO-A2.0USNO-A2 0750-06360898
HIPHIP 42234

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