|Fixed star: PROPUS Tejat Prior| |Constellation: Eta (η) Gemini|
|Longitude 1900: 02CAN02||Longitude 2000: 03CAN26| |Declination
1900: +22.32'||Declination 2000: +22.30'| |Right ascension: 06h
14m||Latitude: -00.53'| |Spectral class: M3||Magnitude: 3.3
Variable| Propus is from the Propous of Hipparchos (circa
160-120 B.C.) and the second-century Greek astronomer Ptolemy,
indicating its position in front of Castor's left foot [actually
on the left foot here and in other drawings], and is its
universal title, with the equivalent Praepes. The 17th century
Italian astronomer Riccioli wrote it Propos, and Flamsteed gave
both Propous and Propus; but the 16th century Danish astronomer
Tycho had applied this last to the star FI. 1 among the extras
of Gemini. This position of eta (η this star Propus) similarly
made it the Pish Pai of the Persians. Bassus and Hyginus said
Tropus, Turn, referring to the apparent turning-point of the
sun's course at the summer solstice, which now is more precisely
marked by the star gamm