36 Ophiuchi is a triple star system 19.5 light years away from Earth. It is in constellation Ophiuchus. A triple star system consists of three gravitationally bound stars. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ... Ophiuchus (known as the serpent holder) is one of the 88 constellations, and was also one of the 48 listed by Ptolemy. ...
The primary and secondary stars is an orange main sequence dwarf of spectral type K1 and the tertiary star is an orange main sequence dwarf of spectral type K5. Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ...
36 Oph B gets no closer than about eight astronomical units, meaning a body orbiting 36 Oph A would have a stable orbit at distances as far as Mars, which is much greater than the habitable zone of the star.
36 Oph B is very similar to 36 Oph A, and has the same potential to support life.
36 Oph C has even lower chances than 36 Oph A and B because it is much dimmer, meaning a planet would have to be closer than Mercury, and would certainly be tidally locked.
Star C is separated from the A-B pair by 700 arc seconds, compared to a minimum of 4.6 arcsec for A-B, so it has a negligible effect on on the movements of the A-B pair.
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