Primärstjärnan HD 21278 A är en blå till vit stjärna i huvudserien av spektralklass B5 V. Den har en massa som är ca 4,6 solmassor, en radie som är ca 4 solradier och har ca 940 gånger solens utstrålning av energi från dess fotosfär vid en effektiv temperatur av ca 15300 K.
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↑"HD 21278". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-12-16.
↑Morrell, Nidia; Abt, Helmut A. (July 10, 1992). "Spectroscopic binaries in the Alpha Persei cluster". Astrophysical Journal, Part 1. 393 (2): 666–673. Bibcode:1992ApJ...393..666M. doi:10.1086/171534.
↑Struve, O. (December 1925). "Twelve new spectroscopic binaries". Astrophysical Journal. 62: 434. Bibcode:1925ApJ....62..434S. doi:10.1086/142944.