556539

556539 is a minor planet located in the main asteroid belt between Mars and Jupiter. The object was first observed on 14 December 2015 by the Pan‑STARRS survey at the Haleakala Observatory in Hawaii. Its provisional designation before receiving its permanent number was 2015 TN74. The discovery images were followed by additional observations from several other telescopes, allowing astronomers to calculate a well‑determined orbit. The Minor Planet Center assigned the number 556539 once the asteroid’s trajectory had been confirmed and its orbital elements were stable.

The asteroid follows a typical S‑type main‑belt orbit, with a semi‑major axis of approximately 2.4 astronomical units, an eccentricity of about 0.12, and an inclination of roughly 4 degrees relative to the ecliptic. Its orbital period around the Sun is roughly 3.7 years. Based on its absolute magnitude of 15.9, the estimated diameter is around 2.3 kilometers, assuming an albedo of 0.20. No substantial documentation exists for a specific naming beyond the official number, and it remains catalogued only by its numeric designation.

556539 is included in the Minor Planet Center’s database and is occasionally referenced in astrophysical surveys of the asteroid belt, particularly studies focused on the distribution of S‑type bodies. Its observational arc spans several months, providing a reliable dataset for refined orbital modeling. The object has not been observed to exhibit any cometary activity or significant outgassing, and its physical characteristics are inferred purely from photometric and astrometric data.