Dramatic Decrease in the period of T Ursae Minoris

Date of the discovery: 1995

Short Description: T Ursae Minoris is a relative evolved star of Mira-type showing a period of 310-315 until 1979. From 1979 the period decreased by 2.75 days a cycle.

Amateur Astronomer(s): Mattei, Janet A.; Foster, Grant

Researchers in the discovery paper: –

Link to paper in ADS: https://ui.adsabs.harvard.edu/abs/1995JAVSO..23..106M/abstract

SIMBAD page: http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=T+Ursae+minoris&submit=SIMBAD+search

Telescopes involved: AAVSO observers

Figrue 3 of the paper, showing the dropping period
period
Other pages:

sky and telescope: https://www.skyandtelescope.com/astronomy-news/century-of-amateur-observations-shed-light-on-a-stars-evolution/

Credit for the header image: Sky & Telescope + AAVSO

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