Ultima Thule

Ultima Thule

An Ultima Thule image in original context against a starry background (i.e., not zoomed in).

Ultima Thule is a trans-Neptunian object located in the Kuiper belt. It is a contact binary 31 km (19 mi) long, composed of two joined bodies 19 km (12 mi) and 14 km (9 mi) across that are nicknamed “Ultima” and “Thule”, respectively.

Aphelion 46.442 AU
Perihelion 42.7212447±0.0014309 AU
Semi-major axis
44.5813998 AU
Eccentricity 0.0417249±0.0000346
Orbital period
298 yr
Mean anomaly
316.55086°
Mean motion
0° 0m 11.92s / day
Inclination 2.45116°±0.000012°
Longitude of ascending node
158.99773°±0.00045°
Argument of perihelion
174.418°±0.03

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