GJ 3323 (also known as LHS 1723) is a nearby single

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

located in the equatorial

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Eridanus, about 0.4° to the northwest of the naked eye star Psi Eridani. It is invisible to the naked eye with an apparent visual magnitude 12.20.

Parallax Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects ...

measurements give a distance estimate of from the Sun. It is drifting further away with a

radial velocity The radial velocity or line-of-sight velocity, also known as radial speed or range rate, of a target with respect to an observer is the temporal rate of change, rate of change of the distance or Slant range, range between the two points. It is e ...

of +42.3 km/s. Roughly 104,000 years ago, the star is believed to have come to within of the Solar System. The

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...

of GJ 3323 is M4.0Ve, indicating that it is a

red dwarf ''Red Dwarf'' is a British science fiction comedy franchise created by Rob Grant and Doug Naylor, which primarily consists of a television sitcom that aired on BBC Two between 1988 and 1999, and on Dave since 2009, gaining a cult following. T ...

, with emission lines appearing in its spectrum. It is fully convective and a source of

X-ray emission Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays. Several types of astrophysical objects emit X-rays. They include galaxy clusters, black holes in active galactic nuclei (AGN), ...

. The star has 17% of the Sun's mass, 19% of the

radius of the Sun Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. The solar radius is usually defined as the radius to the layer in the Sun's photosphere where the optical depth equals 2/3: :1\,R_ = 6.9 ...

, and just 0.4% of the Sun's luminosity.

History of observations

The discovery name of this star is LP 656-38, which indicates that its discovery was published between 1963 and 1981 in University of Minnesota, Minneapolis.Dictionary of Nomenclature of Celestial Objects
LP entry
'' SIMBAD''. Centre de Données astronomiques de Strasbourg. "LP" means " Luyten, Palomar". GJ 3323 is known at least from 1979, when catalogues of high proper motion objects LHS and

NLTT A star catalogue is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, ...

were published by Willem Jacob Luyten, and this object was included to these catalogues.

Distance measurement

In 1982, Wilhelm Gliese published a photometric distance of GJ 3323 (161

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), and in 1991 it was included in the 3rd preliminary version of catalogue of nearby stars by Gliese and Jahreiss as NN 3323 (also designated as GJ 3323) with photometric parallax . Its trigonometric parallax remained unknown until 2006, when it was published by the RECONS team. The parallax was .

Planetary system

On March 15, 2017, two planets orbiting GJ 3323 were detected by the HARPS telescope, although the discovery team considers GJ 3323 c a planet candidate. The inner planet, GJ 3323 b, may orbit within the circumstellar habitable zone of its star.

References

{{DEFAULTSORT:LHS 1723 M-type main-sequence stars Eridanus (constellation) J05015746-0656459 3323 Planetary systems with two confirmed planets