Question: What is the Refsr · M of the body of a solar system object that is probably composed of carbonaceous material ?

text: List of Solar System objects by size
List of objects by radius -- From 20 to 49 km
This list contains a few examples because there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 49 km . [ 191 ] Many thousands of objects of this size range have yet to be discovered in the trans-Neptunian region . The number of digits is not an endorsement of significant figures . The table switches from ×1018 kg to ×1015 kg ( Eg ) . Most mass values of asteroids are assumed . [ 95 ] [ 75 ]
This is a partial list of Solar System objects by size, arranged in descending order of mean volumetric radius, and divided into several size classes. These lists can also be sorted according to an object's mass and, for the largest objects, volume, density and surface gravity, insofar as these values are available. This list contains the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects. Objects on this list are ordered by mean radius rather than mass; thus, objects on the lower portions of the table can be more massive than objects higher on the list if they have a higher density. Many trans-Neptunian objects (TNOs) have been discovered; in many cases their positions in this list are approximate, as there is frequently a large uncertainty in their estimated diameters. Solar System objects more massive than 1021 kilograms (one yottagram [Yg]) are known or expected to be approximately spherical. Astronomical bodies relax into rounded shapes (ellipsoids), achieving hydrostatic equilibrium, when their own gravity is sufficient to overcome the structural strength of their material. It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup; however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time, and a 2019 assessment suggests that many TNOs in the size range of 400-1000 kilometers may not even be fully solid bodies, much less gravitationally rounded. Objects that are ellipsoids due to their own gravity are here generally referred to as being round, whether or not they are actually in equilibrium today, while objects that are clearly not ellipsoidal are referred to as being irregular. Spheroidal bodies typically have some polar flattening due to the centrifugal force from their rotation, and can sometimes even have quite different equatorial diameters (scalene ellipsoids such as Haumea). Unlike bodies such as Haumea, the irregular bodies have a significantly non-ellipsoidal profile, often with sharp edges. There can be difficulty in determining the diameter (within a factor of about 2) for typical objects beyond Saturn.
Body Radius ( km ) Type - notes Refs r · M
Asterope 233 49.836 ± 0.573 belt asteroid type T / type K · M
Pholus 5145 49.5 +7.5 −7 centaur · M
Nausikaa 192 49.388 ± 0.619 belt asteroid type S ·
Thebe Jupiter XIV 49.3 ± 2 moon of Jupiter · M
Lutetia 21 49 ± 1 belt asteroid type M ·
Luscinia 713 48.984 ± 0.438 outer belt asteroid type C · M
Kalypso 53 48.631 ± 13.299 belt asteroid type XC ·
Laurentia 162 48.511 ± 0.247 belt asteroid type STU / type Ch · M
Tercidina 345 48.4325 ± 0.4905 belt asteroid type C ·
Notburga 626 48.42 ± 2.335 belt asteroid type CX / type Xc ·
Henrietta 225 47.967 ± 0.625 belt asteroid type F ; Cybele asteroid · M
Abastumani 1390 47.925 ± 1.142 outer belt asteroid type P · M
Euforbo 4063 47.809 ± 0.339 Jupiter trojan ( L 4 ) type D · M
Tisiphone 466 47.748 ± 0.175 belt asteroid type C · M
Adria 143 47.689 ± 0.349 belt asteroid type C · M
Arsinoë 404 47.485 ± 0.476 belt asteroid type C ·
Artemis 105 47.432 ± 11.611 belt asteroid type C ·
Proserpina 26 47.4 ± 0.85 belt asteroid type S ·
Philosophia 227 47.318 ± 1.278 belt asteroid · M
Kolga 191 47.268 ± 0.217 belt asteroid type XC / type Cb · M