October 31 – Asteroids 261 Prymno and 281 Lucretia

A  brace of early asteroids were discovered on October 31st.  First today we have 261 Prymno, spotted by C H F Peters in 1886.  Prymno is in the main belt, is about 51 km wide, and is a relatively uncommon B-type.  These are similar to C-types, but are generally lighter in colour than their carbonaceous cousins, and tend to have a bluer spectrum.  Asteroid 101955 Bennu is another B-type, about which I expect to be saying a lot more following the launch of the OSIRIS-REx mission on September 8th, 2016.

Prymno is named after an Oceanid of Greek mythology.  They were the daughters (numbering an impressive 3000) of the God Oceanus, the personification of the sea.  Oceanus also had 3000 sons (of course) who were river gods known as the Potamoi.

Oceanus (Römisch-Germanisches Museum, Cologne).

Oceanus (Römisch-Germanisches Museum, Cologne).

Our second asteroid today is 281 Lucretia, discovered two years after Prymno by Johann Palisa.  A fairly small S-type asteroid of about 12 km diameter, Lucretia is a member of the Flora family of asteroids, a big group (about 5% of main belt asteroids are in this family) located in the inner main belt.

Caroline Herschel (1750-1848).

Caroline Herschel (1750-1848).

The naming of Lucretia has nothing to do with the Borgias, and everything to do with the middle name of German-born astronomer Caroline Herschel, sister of the more famous Sir William Herschel.

 

 

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