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We present a survey on the rotational and physical properties of thedynamically low inclination Cold Classical trans-Neptunian objects. The ColdClassicals (CCs) are primordial planetesimals and contain relevant informationabout the early phase of our Solar System and planet formation over the first100 million years after the formation of the Sun. Our project makes use of theMagellan and the Lowell's Discovery Channel Telescopes for photometricpurposes. We obtained partial/complete lightcurves for 42 CCs. We usestatistical tests to derive general properties about the shape and rotationalfrequency distributions of the CC population, and infer that the CCs haveslower rotations and are more elongated/deformed than the other trans-Neptunianobjects. Based on the available full lightcurves, the mean rotational period ofthe CC population is 9.48$\pm$1.53h whereas the mean period of the rest of thetrans-Neptunian objects is 8.45$\pm$0.58h. About 65% of the trans-Neptunianobjects (excluding the CCs) have a lightcurve amplitude below 0.2mag comparedto the 36% of CCs with small amplitude. We present the full lightcurve of onenew likely contact binary: 2004 VC131 with a potential density of 1gcc for amass ratio of 0.4. We also have hints that 2004 MU8 and 2004 VU75 are maybepotential contact binaries based on their sparse lightcurves but more data areneeded to confirm such a find. Assuming equal-sized binaries, we find that only~10-25% of the Cold Classicals could be contact binaries, suggesting that thereis a deficit of contact binaries in this population compared to previousestimates and compared to the abundant (~40-50%) possible contact binaries inthe 3:2 resonant population. This estimate is a lower limit and will increaseif non equal-sized contact binaries are also considered. Finally, we put incontext the early results of the New Horizons flyby of (486958) 2014 MU69.

Lightcurves and Rotational Properties of the Pristine Cold Classical Kuiper Belt Objects