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I'm still reading about it but it sounds pretty serious lol. AFAIK, NASA still doesn't know for sure what's gonna happen.
Background
2007 TU24 was discovered by the Catalina Sky Survey (Arizona) on October 11, 2007.
This object's 1.4-lunar-distance approach on Jan. 29 is the closest for any
known Potentially Hazardous Asteroid until 2027. At this writing, the
object's orbit is too uncertain to identify post-2008 close Earth
approaches, but radar astrometry probably may allow prediction of any
close approaches centuries into the future.
Apart from its absolute visual magnitude (H = 20.1, implying a
diameter ~0.3 km if it has a typical S-class albedo), nothing is known
about TU24's physical properties, but the expected echo
signal-to-noise ratios (SNRs) almost certainly will suffice for
high-resolution using Arecibo or Goldstone.
Goldstone observations are scheduled on January 23 and Arecibo observations are
scheduled on January 27-28 and February 1-4. Note that Goldstone observations straddle
the January 23-24 date boundary;
This object will brighten to about 11th magnitude in late January
when it will be a target for photometric and spectroscopic observations.
Orbital and Physical Characteristics
orbit type Apollo
semimajor axis 2.010 AU
eccentricity 0.529
inclination 5.8°
perihelion distance 0.947 AU
aphelion distance 3.073 AU
absolute magnitude (H) 20.1
diameter 300 meters +- a factor of two
rotation period unknown
pole direction unknown
lightcurve amplitude unknown
spectral class unknown
