(495603) 2015 AM281
, provisional designation , is a resonant trans-Neptunian object in the outermost region of the Solar System, guesstimated at approximately in diameter. It was discovered on 13 March 2010, by astronomers with the Pan-STARRS survey at Haleakala Observatory, Hawaii, United States. Discovery. The body's observation arc begins with a precovery taken by the Sloan Digital Sky Survey in April 2000, nearly 10 years prior to its official discovery observation at Haleakala Observatory. The discovery was announced in a Minor Planet Electronic Circular in July 2016, after additional observations by Pan-STARRS had been found (2010–2013), preceding  the team's original observation from 11 January 2015, which led to the assignment of the object's first and only provisional designation, . The observations were made with Pan-STARRS 1.8-meter Ritchey–Chrétien telescope, and B. Gibson, T. Goggia, N. Primak, A. Schultz, and M. Willman were the observers. Orbit and classification. is a resonant trans-Neptunian object in a 2:5 orbital resonance with Neptune, which means that it orbits the Sun exactly twice while Neptune orbits the Sun five times. with a period of 410 years have been found, including . It orbits the Sun at a distance of  41.4–68.9 AU once every 409 years and 5 months (149,540 days; semi-major axis of 55.14 AU). Its orbit has an eccentricity of 0.25 and an inclination of 27° with respect to the ecliptic. It still has an orbital uncertainty of 1 and 3, respectively. Numbering and naming. This minor planet was numbered by the Minor Planet Center on 9 June 2017 and received the number in the minor planet catalog (). As of 2018, it has not been named. Physical characteristics. According to the Johnston's archive and American astronomer Michael Brown, measures 468 and 479 kilometers in diameter  based on an assumed albedo of 0.09 and 0.07, respectively. As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.