Editing Upsilon Andromedae (section)

=== Upsilon Andromedae A ===
Upsilon Andromedae A is a yellow-white dwarf of [[spectral type]] F8V,<ref name=mk/> similar to the Sun, but younger, more massive, and more [[luminosity|luminous]]. It is around [[1 E17 s|four]] [[billion years]] old and has a similar proportion of [[iron]] relative to [[hydrogen]] to the Sun.<ref name=Baines2025/> At around 1.3 [[solar mass]]es,<ref name=Baines2025/> it will have a shorter lifetime than the Sun. The amount of [[ultraviolet]] radiation received by any planets in the star's [[habitable zone]] would be similar to the ultraviolet [[flux]] the Earth receives from the Sun.<ref name="buccino">{{cite journal | last1=Buccino | first1=Andrea P. | last2=Lemarchand | first2=Guillermo A. | last3=Mauas | first3=Pablo J. D. |display-authors=1|title=Ultraviolet Radiation Constraints around the Circumstellar Habitable Zones|journal=[[Icarus (journal)|Icarus]] | volume=183 | issue=2 | pages=491–503 | date=2006 | doi=10.1016/j.icarus.2006.03.007 | bibcode=2006Icar..183..491B | arxiv=astro-ph/0512291 | citeseerx=10.1.1.337.8642 | s2cid=2241081 }}</ref>

The X-ray emission of Upsilon Andromedae A is low for a star of its spectral class. This means that the star may be moving, or move soon, out of the [[main sequence]] and expand its radius to become a [[red giant]] star. This is consistent with the upper limits on the age of this star. The absolute magnitude for this star is about 0.6 magnitudes brighter that if it were still on the main sequence.<ref name="poppenhaeger"/>

Upsilon Andromedae A was ranked 21st in the list of top 100 target stars for [[NASA]]'s cancelled [[Terrestrial Planet Finder]] mission.<ref name=Mullen>{{cite web |last1=Mullen |first1=Leslie |title=Rage Against the Dying of the Light |url=http://www.astrobio.net/exclusive/4005/rage-against-the-dying-of-the-light |date=2 June 2011 |work=Astrobiology Magazine |access-date=2011-06-07 |url-status=usurped |archive-url=https://web.archive.org/web/20110604121537/http://www.astrobio.net/exclusive/4005/rage-against-the-dying-of-the-light |archive-date=2011-06-04}}</ref>

The star rotates at an inclination of {{val|58|+9|-7}} degrees relative to Earth.<ref name=mnras408_3_1666/>