What is HD 8673?
'''HD 8673''' is a [[Binary star|binary star system]] in the [[constellation]] of [[Andromeda (constellation)|Andromeda]]. It has an [[Magnitude (astronomy)|apparent magnitude]] of 6.34 and [[Magnitude (astronomy)|absolute magnitude]] of 3.56.<ref name=Anderson2012>{{cite journal | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 }}</ref> It is 124.5 [[Light year|light years]] away from us. They are moving away from us with a [[Heliocentrism|heliocentric]] [[radial velocity]] (speed) of 19 km/s. A smaller object, possibly a [[exoplanet]] or [[brown dwarf]], was found orbiting around them in 2005. The main (primary) star is [[Stellar classification|classified]] as an F7 V star. It is almost the same to the Sun but a bit bigger, with a mass of 1.36 times the [[Solar mass|mass of the Sun]] and 1.52 times the [[Solar radius|Sun's size]]. The star is about 1.5 billion years old and is spinning quickly, with a projected radial velocity of 26.9 km/s. It is emitting off 3.4 times more [[Luminosity|light]] than the Sun and has an [[effective temperature]] of 6,340 [[Kelvin|K]]. In 2011, [[Speckle imaging|speckle interferometry]] measurements suggested that there might be another star close to this one. But more observations showed that it was wrong. Later, a smaller star was found orbiting the main (primary) star. This star is about one-third to half the size of the Sun and is far away from the main star, about 35 to 60 times farther than the [[Earth]] is from the Sun. == References == <references /> [[Category:Binary stars]]