[2] Based upon an annual parallax shift of 12.36 mas as seen from Earth,[1] it is located about 264 light-years from the Sun.
[8] Consequently, Upsilon1 Hydrae itself is known as 張宿一 (Zhāng Sù yī), "the First Star of Extended Net".
[6] With a stellar classification of G6/8 III,[3] Upsilon1 Hydrae is an evolved G-type giant star.
It is radiating 162 times the Sun's luminosity from its photosphere at an effective temperature of 5,185 K.[4] The Okayama Planet Search team published a paper in 2005 reporting investigations on radial velocity variations observed for a set of class G giants and announcing the detection of a brown dwarf companion in orbit around Upsilon1 Hydrae.
Since the inclination of the orbit to the line-of-sight is unknown, only a lower bound on the mass can be determined.