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We present the first-ever measurements of the surface colors and rotationalproperties of a recently discovered distant object in an unusual orbit 2016ND21. In 2017, this object was close to its perihelion, which allowed us toobserve it with a 2.0-m telescope at the Peak Terskol observatory. Broadbandphotometric observations of 2016 ND21 were carried out in October and Decemberof 2017 in standard BVR filters of the Johnson-Cousins photometric system.During our observations, we did not detect any cometary activity. We found therotational period of 17.53{\pm}0.02 hr, while another a little longer value of17.65{\pm}0.02 hr is also possible. Assuming an equatorial aspect ofobservations, a peak-to-peak amplitude of A = 0.31{\pm}0.05 mag (or even highersince only one maximum and one minimum were well-measured) corresponds to anelongated body with an axis ratio a/b ~1.3. The lightcurve behavior indicates acomplex, possibly non-convex, shape of this object. The visible absolutemagnitude is HV =12.4{\pm}0.1 mag, which was estimated by using the linearphase slope 0.04 mag/deg as the most probable value from our observations.Assuming a surface albedo in the range of 0.04-0.10, the size of 2016 ND21should be about 15-23 km. From our multi-color observations, we determinedsurface colors V-R = 0.69{\pm}0.04 mag, B-R = 1.79{\pm}0.08 mag, and B-V =1.10{\pm}0.08 mag. The measured colors indicate an extremely red surface ofthis object. A very red surface is unusual for comets, which is in agreementwith the fact, that no cometary activity was detected for 2016 ND21. The B-Rcolor is higher than the typical B-R colors of the red D-type asteroids, but itis consistent with colors of the red Centaurs and TNOs classified as RR type inTNOs classification. This result gives a first evidence of a possible outerbelt origin of this small body.

Photometry of an unusual small distant object 2016 ND21