Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Piscis Austrinus |
Right ascension | 23h 05m 52.03604s [1] |
Declination | −35° 51′ 11.0475″ [1] |
Apparent magnitude (V) | 7.34 [2] |
Characteristics | |
Spectral type | M0.5V [3] |
U−B color index | +1.18 [2] |
B−V color index | +1.50 [2] |
Variable type | Suspected [4] |
Astrometry | |
Radial velocity (Rv) | +9.7 [5] km/s |
Proper motion (μ) | RA: +6,765.995 [6] mas/yr Dec.: +1,330.388 [6] mas/yr |
Parallax (π) | 304.1354 ± 0.0200 mas [7] |
Distance | 10.7241 ± 0.0007 ly (3.2880 ± 0.0002 pc) |
Absolute magnitude (MV) | 9.8 [8] |
Details | |
Mass | 0.479+0.011 −0.010 [9] M☉ |
Radius | 0.474±0.008 [9] R☉ |
Luminosity | 0.0368±0.0006 [9] L☉ |
Surface gravity (log g) | 4.78 [10] cgs |
Temperature | 3,672+36 −34 [9] K |
Metallicity [Fe/H] | −0.22±0.09 [11] dex |
Rotational velocity (v sin i) | 1 [5] km/s |
Age | 4.57 [12] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
Location of Lacaille 9352 in the constellation Piscis Austrinus |
Lacaille 9352 (Lac 9352) is a red dwarf star in the southern constellation of Piscis Austrinus. With an apparent visual magnitude of 7.34, [2] this star is too faint to be viewed with the naked eye except possibly under excellent seeing conditions. Parallax measurements place it at a distance of about 10.74 light-years (3.29 parsecs ) from Earth. [1] It is the eleventh closest star system to the Solar System [14] and is the closest star in the constellation Piscis Austrinus. The ChView simulation [15] shows that its closest neighbour is the EZ Aquarii triple star system at about 4.1 ly away.
This star has the fourth highest known proper motion, [16] (which was first noticed by Benjamin Gould in 1881 [17] ) moving a total of 6.9 arcseconds per year. However, this is still a very small movement overall, as there are 3,600 arcseconds in a degree of arc. The space velocity components of this star are (U, V, W) = (−93.9, −14.1, −51.4) km/s. [18] If the radial velocity (Vr) equals +9.7 km/s then about 2,700 years ago Lacaille 9352 was at its minimal distance of approximately 10.63 ly (3.26 pc) from the Sun. [19]
The spectrum of Lacaille 9352 places it at a stellar classification of M0.5V, [3] indicating it is a type of main sequence star known as a red dwarf. This was the first red dwarf star to have its angular diameter measured, [20] with the physical diameter being about 47% of the Sun's radius. [9] It has around half the mass of the Sun [3] and the outer envelope has an effective temperature of about 3,670 K. [9]
In June 2020, two super-Earth planets were reported, as well as a third signal with a period of 50.7 days that may be due to stellar activity—however, if this planet is real it may be located within the habitable zone. They were detected using the radial velocity method from observations with HARPS in Chile and HIRES in Hawaii. [21] [22]
Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 4.2±0.6 M🜨 | 0.068±0.002 | 9.262±0.001 | 0.09+0.09 −0.06 | — | — |
c | ≥ 7.6±1.2 M🜨 | 0.120±0.004 | 21.789+0.004 −0.005 | 0.22+0.09 −0.10 | — | — |
d(unconfirmed) | ≳ 8.3 M🜨 | ~0.21 | ~50.7 | 0.25+0.20 −0.15 | — | — |
Microscopium is a minor constellation in the southern celestial hemisphere, one of twelve created in the 18th century by French astronomer Nicolas-Louis de Lacaille and one of several depicting scientific instruments. The name is a Latinised form of the Greek word for microscope. Its stars are faint and hardly visible from most of the non-tropical Northern Hemisphere.
Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known as Piscis Notius. Piscis Austrinus was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. The stars of the modern constellation Grus once formed the "tail" of Piscis Austrinus. In 1597, Petrus Plancius carved out a separate constellation and named it after the crane.
Sculptor is a small and faint constellation in the southern sky. It represents a sculptor. It was introduced by Nicolas Louis de Lacaille in the 18th century. He originally named it Apparatus Sculptoris, but the name was later shortened.
Lacaille 8760 is a red dwarf star in the constellation Microscopium. It is one of the nearest stars to the Sun at about 12.9 light-years' distance, and the brightest M-class main-sequence star in Earth's night sky, although it is generally too faint to be seen without a telescope. At an apparent magnitude of +6.7, it may only be visible to the unaided eye under exceptionally good viewing conditions, under dark skies.
Gliese 674(GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellation of Ara. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.38 and an absolute magnitude of 11.09. The system is located at a distance of 14.8 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2.9 km/s. It is a candidate member of the 200 million year old Castor stream of co-moving stars.
HD 4308 is a single star in the southern constellation of Tucana. It has a yellow hue and is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.54. This object is located at a distance of 72 light years, as determined from parallax measurements. It is a population II star and is considered to be a member of the thick disk. The star is receding from the Sun with a radial velocity of +95 km/s.
HD 4628 is a main sequence star in the equatorial constellation of Pisces. It has a spectral classification of K2.5 V and an effective temperature of 5,055 K, giving it an orange-red hue with a slightly smaller mass and girth than the Sun. HD 4628 lies at a distance of approximately 24.3 light years from the Sun based on parallax. The apparent magnitude of 5.7 is just sufficient for this star to be viewed with the unaided eye. The star appears to be slightly older than the Sun—approximately 5.4 billion years in age. The surface activity is low and, based upon the detection of UV emission, it may have a relatively cool corona with a temperature of one million K.
Pi Cassiopeiae, Latinized from π Cassiopeiae, is a close binary star system in the constellation Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of +4.949. Based upon an annual parallax shift of 18.63 mas as seen from Earth, this system is located about 175 light years from the Sun.
72 Herculis is a single star in the northern constellation of Hercules. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 72nd star in Flamsteed's list of stars in Hercules. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.4. Parallax measurements show this star to be located at a distance of about 47 light years from the Sun. It is drifting closer with a radial velocity of −78.6 km/s, and is predicted to come to within 32.1 light-years in around 98,000 years.
IC 2391 is an open cluster in the constellation Vela consisting of hot, young, blueish stars, some of which binaries and one of which is a quadruple. Persian astronomer A. a.-R. Al Sufi first described it as "a nebulous star" in c. 964. It was re-found by Abbe Lacaille and cataloged as Lac II 5.
HD 205739 is a yellow-white hued star in the southern constellation of Piscis Austrinus, positioned near the western constellation boundary with Microscopium. It has the proper name Sāmaya, which was selected in the NameExoWorlds campaign by Sri Lanka, during the 100th anniversary of the IAU. Sāmaya means peace in the Sinhalese language.
HD 5388 is a single star in the southern constellation of Phoenix. It has the Gould designation 78 G. Phoenicis, while HD 5388 is the star's Henry Draper Catalogue identifier. This object has a yellow-white hue and is too faint to be readily visible to average human eyesight, having an apparent visual magnitude of 6.73. It is located at a separation of 173 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +39 km/s.
HD 6718 is a solar twin star in the equatorial constellation of Cetus. It has a yellow hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.45. The distance to this object, as determined from parallax measurements, is 168 light years. It is drifting away from the Sun with a radial velocity of +35 km/s.
Lambda Piscis Austrini, Latinized from λ Piscis Austrini, is a solitary star in the southern constellation of Piscis Austrinus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +5.42. Based upon an annual parallax shift of 6.51 mas as measured from Earth, it is located around 500 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.16 due to interstellar dust.
HD 93385 is a star in the southern constellation of Vela. At an apparent visual magnitude of 7.5, it is too faint to be seen with the unaided eye. Parallax measurements made using the Gaia spacecraft show an annual shift of 23.15 mas. This is equivalent to a physical separation of around 141 light years from the Sun. It is drifting further away with a radial velocity of +47.8 km/s.
10 Canum Venaticorum is the Flamsteed designation for an ordinary star in the northern constellation of Canes Venatici. It has an apparent visual magnitude of 5.95, which, according to the Bortle scale, can be faintly seen with the naked eye from suburban locations. Based upon an annual parallax shift of 0.057 arcseconds, this system is 57.26 light-years from Sun. It is drifting further away with a radial velocity of +80 km/s.
W Aquilae is a variable star in the constellation of Aquila. It is a type of evolved star known as an S-type star. Due to its relatively close distance of 1,200 light-years and equatorial location, it is easy to observe and heavily studied.
Gliese 686 is a star in the constellation of Hercules, with an apparent magnitude +9.577. Although it is close to the Solar System - at 26.5 light years - it is not the closest known star in its constellation, since Gliese 661 is 20.9 light years away. The closest system to this star is the bright μ Herculis, at 4.5 light years. They are followed by GJ 1230 and Gliese 673, at 7.2 and 7.6 light years respectively.
HD 111395 is a single, variable star in the northern constellation of Coma Berenices. It has the variable star designation LW Com, short for LW Comae Berenices; HD 111395 is the Henry Draper Catalogue designation. The star has a yellow hue and is just bright enough to be barely visible to the naked eye with an apparent visual magnitude that fluctuates around 6.29. Based upon parallax measurements, it is located at a distance of 55.8 light years from the Sun. The star is drifting closer with a radial velocity of −8.9 km/s. It is a member of the Eta Chamaeleontis stellar kinematic group.
11 Trianguli is a solitary star located in the northern constellation Triangulum, with an apparent magnitude of 5.55. The star is situated 281 light years away but is approaching with a heliocentric radial velocity of −41.614 km/s. It is probably on the horizontal branch fusing helium in its core, and is calculated to be about 6.3 Gyr old. It has a stellar classification of K1 III. It has 2.446 times the mass of the Sun and 12.055 times the radius of the Sun. It shines at 54.6 times the luminosity of the Sun from its photosphere at an effective temperature of 4,572 K.
absolute magnitude is 9.8