What is Ersa (moon)?
'''Ersa''' is a moon of the planet [[Jupiter]]. It is also called '''Jupiter LXXI'''. [[Scott S. Sheppard]] discovered it on on 11 May 2018, using the 4.0- meter Victor M. Blanco Telescope at Cerro Tololo Observatory,[[Chile]]. This discovery was announced with other discoveries about Jupiter moons, on 17 July 2018 . The object got the temporary designation '''S/2018 J 1''' by the [[Minor Planet Center]], after observations were collected over a long enough time span to confirm its orbit. The satellite has been found in precovery observations as early as 6 August 2000. Ersa is part of the [[Himalia group]], a tight cluster of prograde irregular moons of Jupiter that follow similar orbits to Himalia at semi-major axes between 11-12 million km 6.8-7.5 million mi and inclinations between 26-31 . With an estimated diameter of 3 km 1.9 mi for an absolute magnitude ofr 15.9, it is one of the smallest known members of the Himalia group. [[Category:Jupiter's moons]]