When were they discovered ? And by Whom ?These two Asteroids (Space Rocks) Asteroid 2010 RF12 and Asteroid 2010 RX30 were discovered 3 days ago on September 5th, 2010 by Andrea Boattini using the 1.5 metre reflector telescope at Mount Lemmon in Arizona as part of the Mount Lemmon Survey.
Is there any Danger to Us because of these two asteroids ?No there is no Danger to us as they are not expected to impact earth.
How Close will be they ?Asteroid 2010 RF12 will be passing 77,000 km (0.2 LD) being the closest distance it can get near to Earth Inside the Orbit of Moon.
Asteroid 2010 RX30 will be passing 231,000 km (0.6 LD) being the closest distance it can get near to Earth Inside the Orbit of Moon.
Can we see these asteroids from Earth ? Are they Bright enough ?
According to NASA Both of these asteroids should be observable with moderate-sized amateur telescopes.
Here are the videos of the asteroid and their expected orbit according to Data of NASA.