1719 Jens is a main belt asteroid

Asteroid

Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

 about 19 kilometres (11.8 mi) in diameter with an orbital period

Orbital period

The orbital period is the time taken for a given object to make one complete orbit about another object.When mentioned without further qualification in astronomy this refers to the sidereal period of an astronomical object, which is calculated with respect to the stars.There are several kinds of...

 of 1583.2978264 days (4.33 years). It rotates every 5.9 hours.

Jens was discovered on February 17, 1950 by Karl Reinmuth from the Heidelberg-Königstuhl State Observatory, then in West Germany

West Germany

West Germany is the common English, but not official, name for the Federal Republic of Germany or FRG in the period between its creation in May 1949 to German reunification on 3 October 1990....

. Reinmuth named it after his grandson.

In 2010, NASA

NASA

The National Aeronautics and Space Administration is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research...

's Wide-field Infrared Survey Explorer

Wide-field Infrared Survey Explorer

Wide-field Infrared Survey Explorer is a NASA infrared-wavelength astronomical space telescope launched on December 14, 2009, and decommissioned/hibernated on February 17, 2011 when its transmitter was turned off...

 satellite photographed Jens crossing the Tadpole Nebula.