TWO ASTEROIDS (SPACE ROCKS) to Pass by Earth 8th Sept, 2010

On 8th September, 2010 two asteroids Asteroid 2010 RF12 and Asteroid 2010 RX30 will passby us moving  between Earth's and Moon's Orbit. These two asteroids which are in several meters in diameter moving in unrelated orbits, will pass within the Moon's distance of Earth today Wednesday, September 8th

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. 

Asteroid 2010 RF12 Earth Flyby - Inside Moon's Orbit

Asteroid 2010 RX30 Earth Flyby - Inside Moon's Orbit