The star p Eridani (not rho) is one of the most interesting double stars in the southern hemisphere. It is a double stars that had been observed since 1826.
Two astronomers making observations up until 1908, Mr Nangle using a 6.5 inch telescope and Mr Hirst using a 4.5 inch telescope both made by Thomas Cooke & Sons of York, agree that the distance between the two components of p Eridani are getting closer.
Today we know that the system contains 2 K class main sequence stars orbiting each other every 475 years.
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