4789 Sprattia (1987 UU2) là một tiểu hành tinh vành đai chính được phát hiện ngày 20 tháng 10 năm 1987 bởi Jeremy B. Tatum và David D. Balam ở Victoria, British Columbia.
The following citation is from MPC 18465:
(4789) Sprattia = 1987 UU2
Tênd in honor of Christopher E. Spratt, an active amateur member of the Royal Astronomical Society of Canada for 20 năm, with special interests in comets, minor planets, meteors và variable stars. He has written numerous articles ngày these subjects, including some ngày Canadian meteorites, in the Journal of the Royal Astronomical Society of Canada, and he has been of much practical help to the astrometric program carried out at the University of Victoria. Spratt maintains a carefully chosen representative collection of meteorites và was coordinator for the northwest North American section of the Amateur Observation Network of the International Halley Watch. He has contributed more than 32 000 observations of long-period và semiregular variable stars và dwarf novae to the American Association of Variable Star Observers và in 1976 was the most prolific observer of that year. The Chant Medal of the Royal Astronomical Society of Canada was bestowed upon him in 1988. Spratt holds an honors diploma in horticulture and, as a professional member of the gardening staff ở the University of Victoria, does much to make the university a pleasant place in which to work. Citation provided bởi J. B. Tatum ở the request of the discoverer.