phone number
(colloquial expression for coordinates)
Astronomers sometimes use the term phone number colloquially for
the designating coordinates of an astronomical object.
Typically what is meant is a J designator or a survey-based designator
that includes the coordinates.
(astronomy,designation,coordinates,reference)
Further reading:
https://en.wikipedia.org/wiki/Luhman_16
http://www.pas.rochester.edu/~emamajek/flyby.html
https://neildegrassetyson.com/books/1994-05-guide-to-astronomical-jargon/
Index