NEED COMET DOOM?

A/2013 VX9 [Catalina] for example.

This unusual asteroid was discovered by the Catalina Sky Survey with the 0.68m Schmidt on November 4.38. The asteroid has an orbit with a period of around 10 years and perihelion at 2.0 au in 2013 October. [MPEC 2013-V50, 2013 November 9, 5-day orbit].

it can approach within 0.5 au of the planet
.

Or A/2013 TL117 [Mt Lemmon]

in February.

This unusual asteroid, classified as an Amor, was discovered during the Mt Lemmon survey with the 1.5m telescope on October 4 and was also designated as 2013 UT2. The object has a period of around 6.8 years and perihelion at 1.1 au in 2014 February. [MPEC 2013-U68, 2013 October 28, 24-day orbit]. The Tisserand parameter of the orbit with respect to Jupiter is 2.64 and the object can approach within 0.5 au of the planet and to 0.2 au from the Earth.

Another good one, a dead comet oooOOOOO.

400 year orbit but it happens to come at the same time as ISON and the convoy, coincidence?

A/2013 PE67 [Catalina]

This unusual asteroid was discovered by the Catalina Sky Survey with the 0.68m Schmidt on August 9.27. The initial retrograde orbit gives a period of around 400 years with perihelion at 1.8 au in 2013 December. [MPEC 2013-Q15, 2013 August 18, 15-day orbit]. Aphelion is at over 100 au. The Tisserand parameter of the orbit with respect to Jupiter is -0.66. The orbit is cometary, so this may be a "dead" comet and could show activity when it gets closer to perihelion.