Variabiliteten i ljusstyrkan hos HD 128333 tillkännagavs av Joel Stebbins och Charles Morse Huffer år 1928, baserat på observationer gjorda vid Washburn Observatory. Den fick dess variabelbeteckning, CH Bootis, år 1977.
CH Bootis är en röd till orange jättestjärna av spektralklass M1 III, Den har en massa som av ca 1,1 solmassa, en radie av ca 67 solradier och utsänder energi från dess fotosfär motsvarande ca 869 gånger solen vid en effektiv temperatur av ca 3700 K.
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↑Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory. 15: 137–174. Bibcode:1928PWasO..15..137S. Hämtad 5 december 2024.
↑Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1248: 1–25. Bibcode:1977IBVS.1248....1K. Hämtad 5 december 2024.
↑"Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Hämtad 8 december 2021.