Upsilon Andromedae e

It is best treated as an unconfirmed candidate rather than a settled planet. The NASA Exoplanet Archive's system overview lists Upsilon Andromedae b, c, and d as confirmed planets, but not e. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/Ups%20And%20b)

A fourth radial-velocity signal was reported in 2010 and labeled Upsilon Andromedae e, also written as HD 9826 e. Later analyses found that the fitted orbit changed with the data set, which is why the object did not become a stable confirmed catalog entry. [Dynamical Analysis of the 3:1 Resonance](https://arxiv.org/abs/1108.2736)

Historical candidate fits placed it on a long outer orbit of roughly a decade at about 5 astronomical units, with a giant-planet minimum mass near Jupiter's. Those values are candidate parameters, not secure measurements, because the planet itself remains unconfirmed.

The well-established inclination result concerns planets c and d, whose orbital planes differ by about 30 degrees. That finding came from Hubble, the Hobby-Eberly Telescope, and other ground-based observations, and it should not be attributed to the unconfirmed e candidate. [NASA Hubble](https://science.nasa.gov/asset/hubble/upsilon-andromedae-a-system/)