Upsilon Aquarii
{{short description|Star in the constellation Aquarius}}{{distinguish|U Aquarii}}
{{Starbox begin}}
{{Starbox image
| image =
{{Location mark
| image=Aquarius IAU.svg
| float=center | width=240 | position=right
| mark=Red circle.svg | mark_width=10 | mark_link=υ Aqr
| x%=43.9 | y%=59.8
}}
| caption = Location of υ Aquarii (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = Aquarius
}}
{{Starbox character
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|−2.28|0.51}}
| prop_mo_ra = +221.185
| prop_mo_dec = −147.090
| parallax = 43.4396
| p_error = 0.0828
}}
{{Starbox detail
| component1 = A
| luminosity = 3.61{{±|0.16|0.14}}
| temperature = 6,606{{±|52|46}}
| age_gyr = {{val|0.25|0.75|0.05}} to {{val|1.69|0.62|1.68}}
}}
{{Starbox catalog
| names = {{odlist | B=υ Aquarii, υ Aqr | F=59 Aquarii | BD=−21 6251 | FK5=849 | GC=31516 | Gl=863.2 | HD=213845 | HIP=111449 | HR=8592 | PPM=273980 | SAO=191235 }}
}}
{{Starbox reference
| Simbad = ups+Aqr
}}
{{Starbox end}}
Upsilon Aquarii is a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from υ Aquarii, and abbreviated Upsilon Aqr or υ Aqr. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.21. Parallax measurements give a distance estimate of {{Convert|75.1|ly|pc|abbr=off|lk=on}} from Earth. This is a high proper-motion star that is drifting closer to the Sun with a radial velocity of –2.3 km/s. It is part of the Hercules-Lyra association of co-moving stars.
The primary component is an F-type main sequence star with a stellar classification of F7 V. Age estimates range from 250 million to 1.7 billion years old, and it is spinning with a projected rotational velocity of 35 km/s. The star has 1.32 times the mass of the Sun and 1.45 times the Sun's radius. It is radiating 3.6 times the Sun's luminosity from its photosphere at an effective temperature of 6,606 K, giving it the yellow-white hue of an F-type star.
The star displays an excess of near infrared radiation, suggesting it has a circumstellar disk of dusty debris. This disk has a mean temperature of {{val|75|17|u=K}} and is orbiting at an estimated radius of {{val|84|41|ul=AU}}. A faint stellar companion was detected in 2007 at the Gemini Observatory, with a separation of {{val|6.09|0.03|ul=arcsecond}} from the primary. This is equivalent to a physical projected separation of {{val|139|ul=AU}}, which yields an estimated orbital period of ~{{convert|486000|days|years|disp=out|abbr=off}}. The debris disk is orbiting close to the dynamically unstable region of this system.
As of 2024, the NASA Exoplanet Exploration Program has deemed this star one of the "most accessible to survey for potentially habitable exoplanets with the Habitable Worlds Observatory".
References
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External links
- [http://aladin.u-strasbg.fr/AladinPreview?-c=22+34+41.6369-20+42+29.577&ident=NLTT+54210&submit=Aladin+previewer Image Upsilon Aquarii]
{{Stars of Aquarius}}
{{DEFAULTSORT:Upsilon Aquarii}}
Category:F-type main-sequence stars