Asteroid 137 Meliboea was discovered by Johann Palisa on April 21st 1874. It is the largest of a family of similar asteroids, which includes the wonderfully named 2829 Bobhope, discovered by E L Johnson in 1948 and named after the legendary comedian.
Meliboea is a C-type asteroid of about 145 km (90 miles) wide, with an absolute magnitude of 8.1. There are several Maliboea’s in Greek mythology, and it isn’t known after which one this particular discovery was named.
Two years later, on April 21st 1876, French astronomer brothers Paul and Prosper Henry spotted their ninth asteroid, 162 Laurentia, with credit for the discovery being attributed to Prosper, in line with their habit of taking one each alternately. The name they chose was a tribute to another French astronomer, A. Laurent, discoverer of asteroid 51 Nemausa in 1858. Laurentia is another C type, with a diameter of approximately 99 km (61 miles).
Our third and final asteroid of the day is 470 Kilia, discovered by Italian astronomer Luigi Carnera on this day in 1901. Kilia is fairly small, at 26 km across (16 miles), and according to the JPL Small-Body Database, it is a stony “S-type”, and has been named in honour of the German town of Kiel, on the Jutland peninsula.
Carnera was always going to find an asteroid or two, as he had worked for Max Wolf, German asteroid-bagger extraordinaire.
1972 – At 02:23 UT, John Young and Charles Duke, in the lunar module of Apollo 16, touched down on the Moon. Pilot Ken Mattingly II had to stay behind to ensure the command module didn’t escape while they were down there.