Claim: 2623 Zech, a binary asteroid, orbits the Sun in the inner main-belt at a distance of 1. 7–2. 8 AU, once every 1,236 days.
Evidence: 2623 Zech, provisional designation A919 SA, is a stony binary asteroid from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. Zech is a stony S-type asteroid that orbits the Sun in the inner main-belt at a distance of 1.7–2.8 AU once every 3 years and 5 months (1,236 days).