28 Andromedae is an A-typegiant star, meaning it is colored bluish-white. Parallax estimates made by the Hipparcos spacecraft put the star at a distance of about 205 light years (63 parsecs). It's moving towards the solar system at a velocity of 10.30 km/s.
Two stars near 28 Andromedae share a common proper motion with the primary star, which is then a candidate triple system. The orbital parameters are currently unknown. The second and third component have masses of 0.71 M☉ and 0.14 M☉ respectively.
28 Andromedae A is a Delta Scuti variable, so it displays small luminosity variations at timescales less than a day due to star pulsation. There is evidence for two periodic cycles of 5014 and 5900 seconds, respectively. The amplitude variations, though, are not constant in time, and the pulsation modes are not radial.
^McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. Bibcode:2012MNRAS.427..343M.
^Royer, F.; Grenier, S.; Baylac, M. -O.; Gómez, A. E.; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393: 897–911. Bibcode:2002A&A...393..897R.
^ abRodriguez, E.; Rolland, A.; Lopez-Gonzalez, M. J.; Costa, V. (1998). "Extreme amplitude variations in 28 And". Astronomy and Astrophysics. 338: 905–908. Bibcode:1998A&A...338..905R.
^De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; Macintosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216–1240. Bibcode:2014MNRAS.437.1216D.
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