Another one from the golden age of minor planet discovery, the 1880s. 259 Aletheia was discovered on June 28th 1886 by C F H Peters, one of the most successful asteroid hunters of the nineteenth century. He will be our birthday boy on September 19th.
Aletheia is a large main belt asteroid of about 178km diameter, rotating every 15 hours (quite fast), with an absolute magnitude of 7.76 (reasonably dim), and an albedo of 0.043 (very dark).
Today’s black rock is named after the Greek goddess of truth and sincerity (her Roman equivalent is Veritas). The Greeks had a god or goddess for just about everything, but this is particularly so when it comes to emotions. This makes for a vast supply of potential astronomical names, not all of which have been used yet, for example Eris (strife – used), Ate (ruin – used), Dolus (cunning – not used) and Metus (fear – not used).