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Australian observations of a stellar occultation by Sedna in 2013 produced similar results on its diameter, giving chord lengths 1025 ± 135 km and 1305 ± 565 km. [9] The size of this object suggests it could have undergone differentiation and may have a sub-surface liquid ocean and possibly geologic activity. [60]
This list contains a selection of objects 50 and 99 km in radius (100 km to 199 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following ...
A 2021 occultation of 2004 XR 190 ("Buffy") found a chord of 560 km: if the body is approximately spherical, it is likely that the diameter is greater than 560 km, but if it is elongated, the mean diameter may well be less. Explanations and sources for the measured masses and diameters can be found in the corresponding articles linked in column ...
However, Borisov's V inf was only slightly higher, at 32.3 km/s (72,000 mph), but due to its higher perihelion distance of ~2.003 au, its eccentricity was a comparably higher 3.340. In practice, no object originating from the Solar System should have an incoming heliocentric eccentricity much higher than 1, and should rarely have an incoming ...
This far infrared radiation is so dim that the thermal method is only applicable to the largest KBOs. For the majority of (small) objects, the diameter is estimated by assuming an albedo. However, the albedos found range from 0.50 down to 0.05, resulting in a size range of 1,200–3,700 km for an object of magnitude of 1.0. [24]
[7]: 9 The depth of 2002 MS 4 's massive depression takes up 5.7% of 2002 MS 4 's diameter and exceeds those seen in the largest craters of other Solar System bodies of comparable size: the largest crater of Saturn's moon Mimas has a depth of up to 10–12 km (6.2–7.5 mi) [44]: 424 and Vesta's Rheasilvia crater has a depth of up to 25 km (16 mi).
The result was: scheduled for Wikipedia:Today's featured article/November 14, 2023 by Gog the Mild 17:41, 28 September 2023 (UTC) Artist's visualization of Sedna. Sedna is a trans-Neptunian object with the asteroid number 90377 .
Sedna Planitia is a large lowland area of Venus, south of Ishtar Terra. [ 1 ] [ 2 ] [ 3 ] It is thought to be lava-covered and similar to a lunar mare . Its name is derived from the Inuit sea goddess .