5028 Halaesus (1988 BY1) is a Jupiter Trojan discovered on January 23, 1988 by Shoemaker, C. S. at Palomar.
Photometric observations of this asteroid during 1996 were used to build a light curve showing a rotation period of 24.937 ± 0.015 hours with a brightness variation of 0.29 ± 0.01 magnitude.
- ^ a b c Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; Hahn, Gerhard; Schober, Hans-Josef; Lahulla, Felix; Delbò, Marco; Lagerkvist, Claes-Ingvar (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal 141 (5): 170. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.