It has the Bayer designation K Carinae, abbreviated K Car, while HR 4138 is the star's designation in the Bright Star Catalogue. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.72.
K Carinae, as per Bayer's designation, is also known as HR 4138 in the Bright Star Catalogue. This star has a white appearance and can be seen with difficulty using only the naked eye, having an apparent visual magnitude of +4.72.