3309 Brorfelde is an inner main belt asteroid. It is a member of the Hungaria family. It was discovered on 28 January 1982 by K. S. Jensen, at Brorfelde Observatory in Denmark, for which it was named.
Brorfelde measures approximately 6km in diameter.
In 2005 it was reported that lightcurve observations indicate the possibility of a moon orbiting Brorfelde. In 2006 it was confirmed at the Palmer Divide Observatory that 3309 Brorfelde is a binary asteroid.
- Spratt, Christopher E. (April 1990). "The Hungaria group of minor planets". Royal Astronomical Society of Canada, Journal (ISSN 0035-872X) 84 (2): 123–131. Bibcode:1990JRASC..84..123S.
- Warner, B. D. (May 2006). "Recent Asteroid Lightcurve Studies at the Palmer Divide Observatory". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23-25, 2006, at Big Bear, CA. Published by the Society for Astronomical Sciences.: 117. Bibcode:2006SASS...25..117W.