Several [asteroids] no doubt sneak about near Mercury and Venus. But it’s “incredibly difficult to discover objects interior to Earth’s orbit with our current discovery telescopes,” Dr. Thomas said. During most hours of the day, the sun blinds Earth’s telescopes and objects can be hunted only in the few minutes around twilight.
NAU astronomy undergrad Claire Gibson wrote a nice article for the Flagstaff Festival of Science web page about PhD student Lucas McClure
Read it here.