TextSearch

Zeta Reticuli (ζ Ret) is a wide binary star system composed of two Sun-like stars located at a distance of 39.3 ly from Earth in the constellation Reticulum.

Zeta Reticuliby admin2025-02-262025-02-26Zeta Reticuli (ζ Ret) is a wide double star located in the southern constellation Reticulum. The star system is composed of two Sun-like stars, Zeta1 and Zeta2 Reticuli, located at a distance of about 39.3 light years from Earth. The yellow dwarf stars have apparent magnitudes of 5.52 (Zeta1) and 5.22 (Zeta2) and are visible without binoculars from areas without light pollution.Even though the Zeta Reticuli system has been the target of several planet hunting projects, no planets have been confirmed orbiting either star to date.Table of Contents ToggleStar systemPlanetsFactsZeta Reticuli in ufologyZeta Reticuli IncidentZeta Reticuli mapLocationConstellationStar systemThe Zeta Reticuli system consists of two yellow main sequence stars of spectral types G3-5V and G2V. Both components of the wide binary star system are younger than the Sun. They have an estimated age between 1.5 and 3 billion years.Designated Zeta1 and Zeta2 Reticuli, the two solar analogs are slightly smaller, less massive and less luminous than the Sun. Zeta1 lies at a distance of 39.28 light years, while Zeta2 is 39.27 light years away. The stars share similar radial velocities and proper motions, indicating that they form a physical system and have a common origin.Zeta1 and Zeta2 Reticuli are separated by 309.2 arcseconds on the sky and appear as a close double star to the unaided eye in good conditions. The angular separation between the yellow dwarfs corresponds to a physical distance of at least 3,750 astronomical units (0.06 ly). This is equivalent to almost a hundred times the distance from the Sun to Pluto. The two stars complete an orbit around a common centre of mass every 170,000 or more years.<img fetchpriority="high" decoding="async" aria-describedby="caption-attachment-7733" class="size-full wp-image-7733" src="https://www.star-facts.com/wp-content/uploads/2020/09/Zeta-Reticuli-1.webp" alt="zeta reticuli star,zeta reticuli star system,zeta1 reticuli and zeta2 reticuli" width="700" height="500" srcset="https://www.star-facts.com/wp-content/uploads/2020/09/Zeta-Reticuli-1.webp 700w, https://www.star-facts.com/wp-content/uploads/2020/09/Zeta-Reticuli-1-300x214.webp 300w" sizes="(max-width: 700px) 100vw, 700px" />Zeta Reticuli, image credit: ESO/Digitized Sky Survey 2 (CC BY 4.0)Zeta1 Reticuli has a mass of 0.94 solar masses and a radius of 0.90 solar radii. With an effective temperature of 5,729 K, it shines with 0.761 solar luminosities. The star has a projected rotational velocity of 2.2 km/s.Zeta2 Reticuli is slightly larger and more massive, with a size of 0.98 solar radii and a mass of 0.96 solar masses. With a surface temperature of 5,861 K, it has 97.2% of the Sun’s luminosity. It spins at 1.74 km/s.Both Zeta1 and Zeta2 Reticuli are slightly metal deficient. They have only about 60% of the Sun’s metallicity. Both stars have severely low abundances of beryllium.Beryllium is one of the elements that are destroyed by nuclear fusion in the interiors of stars. Very young stars have the beryllium they were born with and, as they get to an older age, they destroy up to 85% of their beryllium. The presence of the element on the stellar surface reveals how deeply the surface layers extend into the interior.A study published in 2012 suggested that beryllium depletion may either be a result of early accretion or rotational mixing. In the first scenario, when they were still protostars, the stars underwent many intense bursts of mass accretion from the protostellar cloud, which increased the temperature at the bottom of their convective envelopes, consequently increasing beryllium destruction. In the second case, they had high rotational velocities in their youth and underwent rotational mixing, with a radial flow of mass transporting angular momentum and chemical composition.A 2005 study that constructed chromospheric models of solar analogues found an intermediate level of magnetic activity in the chromosphere of Zeta1 Reticuli.A 2018 study of the long-term activity of the Zeta Reticuli system found an activity cycle with a period of about 10 years in Zeta2 Reticuli, comparable to the Sun’s (about 11 years). The study also revealed an eccentric variability in the more active Zeta1 Reticuli.A 2020 study based on two decades of observations with the HARPS, REOSC, UVES, and FEROS spectrographs found a high activity level for Zeta1 Reticuli and a significant decrease in the magnetic activity cycle amplitude of Zeta2 Reticuli. The astronomers found a period of 4.2 years for Zeta1 and 7.9 years for Zeta2. They proposed that the decreasing amplitude in the activity of Zeta2 Reticuli may be evidence that the star is in a Maunder Minimum (MM) state.The MM state is a prolonged sunspot minimum observed in the Sun when sunspots became very rare between 1645 and 1715. Zeta2 Reticuli is the first MM candidate detected through discrepant activity in a binary star system.A 2002 study of stars with low chromos...

Zeta Reticuli (ζ Ret) | Star Facts