[1] Eta Chamaeleontis has a spectral type of B8V, meaning it is a B-type main sequence star.

[3] Stars of this type are typically a few times more massive than the Sun and have effective temperatures of about 10,000 to 30,000 K. Eta Chamaeleontis is just over 3 times more massive than the Sun[7] and has a temperature of about 12,000 K.[9] Eta Chamaeleontis is the brightest and most massive member of the eponymous Eta Chamaeleontis cluster (also known as the Eta Chamaeleontis association or Mamajek 1, pronounced /ˈmæmədʒɛk/), a very nearby (316 light years), and young (8 million years old) stellar moving group discovered in 1999.

[10] The cluster contains nearly 20 stellar members spread out over a 40-arcminute diameter region of sky, including the neighboring A-type star HD 75505 and the eclipsing binary RS Cha.

[11] The eclipsing binary RS Cha is a well-constrained system which enables precise age-dating, which recent results yield an age of 9 million years.

[12] All of the low-mass members (including RS Cha) are pre-main sequence, and several of them appear to still be accreting from protoplanetary disks.