Properties
Dysnomia was found 4.43 magnitudes fainter than Eris, and its diameter is estimated to be between 350 and 490 km, though Mike Brown claims that it is 500 times fainter and between 100 and 250 km in diameter. It is 60 times fainter than Eris in the K' band and 480 times fainter in the V band, which means a very different, and quite redder, spectrum, indicating a significantly darker surface. Assuming its albedo is five times lower than Eris's, its diameter would be 685±50 km.
Combining Keck and Hubble observations, the satellite was used to determine the mass of Eris, and orbital parameters were estimated. Its orbital period is calculated to be 15.774±0.002 d. These observations indicate that Dysnomia has a circular orbit around Eris, with a radius of 37,350±140 km. This suggests that the mass of Eris is approximately 1.27 times that of Pluto.
Read more about this topic: Dysnomia (moon)
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