3360 Syrinx

3360 Syrinx (originally designated 1981 VA) is an Apollo and Mars crosserasteroid discovered in 1981. It approaches Earth to within 0.27 AU (40 million km; 110 LD) three times in the 21st century: 0.22 AU (33 million km; 86 LD) in 2039, 40 million km in 2070, and 0.16 AU (24 million km; 62 LD) in 2085.

On 20 September 2012, it closely encountered Earth at a distance of 0.4192 AU (62,710,000 km; 38,970,000 mi), peaking in brightness at an apparent magnitude of 17.0. In opposition on 23 November 2012, it brightened to magnitude 16.0.

It is a member of the Alinda group of asteroids with a 3:1 resonance with Jupiter that has excited the eccentricity of the orbit over the eons. As an Alinda asteroid it makes approaches to Jupiter, Earth, and Venus.

For a time, it was the lowest numbered asteroid that had not been named. In November 2006, this distinction passed to 3708 Socus, and in May 2021 to (4596) 1981 QB.