Lacaille 9352

Star in the constellation Piscis Austrinus

Lacaille 9352

the neighborhood of the solar system which also includes Lacaille 9352

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

HD 217987, CD-36°15693, GCTP 5584, GJ 887, LHS 70, SAO 214301, LTT 9348, LFT 1758, Cordoba 31353, NSV 14420, HIP 114046, UGPMF 591[13]

Database references
SIMBAD| data
ARICNS| data

Lacaille 9352

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.

## Properties[edit]

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]

## Planetary system[edit]

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]

The Lacaille 9352 planetary system  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 | —  | —

## See also[edit]

* List of nearest stars and brown dwarfs

## References[edit]

1. ^ a b c van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
2. ^ a b c d Cousins, A. W. J. (1973). "UBV photometry of some southern stars". Monthly Notes of the Astronomical Society of Southern Africa. 32: 11. Bibcode:1973MNSSA..32...11C.
3. ^ a b c Demory, Brice-Olivier; Ségransan, Damien; Forveille, Thierry; Queloz, Didier; Beuzit, Jean-Luc; Delfosse, Xavier; Di Folco, Emmanuel; Kervella, Pierre; Le Bouquin, Jean-Baptiste; Perrier, Christian; Benisty, Myriam; Duvert, Gilles; Hofmann, Karl-Heinz; Lopez, Bruno; Petrov, Romain (October 2009). "Mass-radius relation of low and very low-mass stars revisited with the VLTI". Astronomy and Astrophysics. 505 (1): 205–215. arXiv:0906.0602. Bibcode:2009A&A...505..205D. doi:10.1051/0004-6361/200911976. S2CID 14786643.
4. ^ Micela, G.; Pye, J.; Sciortino, S. (April 1997). "Coronal properties of nearby old disk and halo dM stars". Astronomy and Astrophysics. 320: 865–877. Bibcode:1997A&A...320..865M.
5. ^ a b Torres, G. R.; et al. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695–708. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. S2CID 16080025.
6. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
7. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e).  Gaia EDR3 record for this source at VizieR.
8. ^ Murdin, Paul, ed. (November 2000). "Lacaille 9352". Encyclopedia of Astronomy and Astrophysics. Bristol: Institute of Physics Publishing. Bibcode:2000eaa..bookE5158.. doi:10.1888/0333750888/5158. ISBN 0333750888. "absolute magnitude is 9.8"
9. ^ a b c d e f Pineda, J. Sebastian; et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal. 918 (1): 23. arXiv:2106.07656. Bibcode:2021ApJ...918...40P. doi:10.3847/1538-4357/ac0aea. S2CID 235435757. 40.
10. ^ Rabus, Markus; Lachaume, Régis; Jordán, Andrés; Brahm, Rafael; Boyajian, Tabetha; Von Braun, Kaspar; Espinoza, Néstor; Berger, Jean-Philippe; Le Bouquin, Jean-Baptiste; Absil, Olivier (2019). "A discontinuity in the Teff–radius relation of M-dwarfs". Monthly Notices of the Royal Astronomical Society. 484 (2): 2674–2683. arXiv:1901.08077. Bibcode:2019MNRAS.484.2674R. doi:10.1093/mnras/sty3430. S2CID 119189542.
11. ^ López-Morales, Mercedes (May 2007). "On the Correlation between the Magnetic Activity Levels, Metallicities, and Radii of Low-Mass Stars". The Astrophysical Journal. 660 (1): 732–739. arXiv:astro-ph/0701702. Bibcode:2007ApJ...660..732L. doi:10.1086/513142. S2CID 119530297.
12. ^ Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017). "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library". The Astrophysical Journal. 836 (1): 77. arXiv:1701.00922. Bibcode:2017ApJ...836...77Y. doi:10.3847/1538-4357/836/1/77. S2CID 6302522.
13. ^ "LACAILLE 9352 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-01-20.
14. ^ Research Consortium on Nearby Stars. "The One Hundred Nearest Star Systems". Georgia State University. Archived from the original on 2012-05-13. Retrieved 2010-01-20.
15. ^ "Solstation and ChView". Retrieved 2010-04-20.
16. ^ "High Proper Motion Stars in the Hipparcos Catalogue". European Space Agency. July 1, 2007. Retrieved 2010-01-20.
17. ^ Gould, B. A. (1881). "Corrigenda in the Uranometria Argentina. Star with large proper motion". Astronomische Nachrichten. 100 (1): 7–10. Bibcode:1881AN....100....7G. doi:10.1002/asna.18811000104.
18. ^ "ARICNS star page of Lacaille 9352". Astronomisches Rechen-Institut Heidelberg. Archived from the original on 2012-09-16. Retrieved 2010-04-16.
19. ^ "Annotations on NAME LACAILLE 9352 object". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-16.
20. ^ Glindemann, Andreas; Paresce, Francesco. "Giant Eyes for the VLT Interferometer". European Southern Observatory. Retrieved 2010-01-20.
21. ^ Jeffers, S. V.; Dreizler, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodríguez, E.; López-González, M. J.; Morales, N.; Luque, R.; et al. (2020), "A multiple planet system of super-Earths orbiting the brightest red dwarf star GJ887", Science, 368 (6498): 1477–1481, arXiv:2006.16372, Bibcode:2020Sci...368.1477J, doi:10.1126/science.aaz0795, PMID 32587019, S2CID 220075207
22. ^ Witze, Alexandra (2020). "Why boring could be good for this star's two intriguing planets". Nature. doi:10.1038/d41586-020-01905-5. PMID 34168349. S2CID 220507688. Retrieved 2020-06-30.

## External links[edit]

* SolStation.com: Lacaille 9352

* v
* t
* e

← Celestial objects within 15–20 light-years

| Primary member type|

Celestial objects by systems.

| Subgiant stars|

| G-type|

* Delta Pavonis (19.893±0.015 ly)

|

| Main-sequence
stars|

| A-type|

* Altair (Alpha Aquilae) (16.730±0.049 ly)

|

G-type|

* Alsafi (Sigma Draconis) (18.7993±0.0081 ly)
* Achird (Eta Cassiopeiae) (19.3314±0.0025 ly)
* K-type main-sequence star B
* e (82 G.) Eridani (19.7045±0.0093 ly)
* 2 (6?) planets: b, c?, d, e?, f?, g?

K-type|

* Groombridge 1618 (15.8857±0.0017 ly)
* Omicron2 (40) Eridani (16.3330±0.0042 ly)
* white dwarf B
* red dwarf C
* 70 Ophiuchi (16.7074±0.0087 ly)
* K-type main-sequence star B
* Gliese 570 (19.1987±0.0074 ly)
* 2 red dwarfs: B, C
* T-type brown dwarf D
* 36 Ophiuchi (19.4185±0.0036 ly)
* 2 K-type main-sequence stars: B, C
* HR 7703 (19.609±0.013 ly)
* red dwarf B

M-type
(red dwarfs)|

* GJ 1245 (15.2001±0.0034 ly)
* 2 red dwarfs: B, C
* Gliese 876 (15.2382±0.0025 ly)
* 4 planets: d, c, b, e
* LHS 288 (15.7586±0.0034 ly)
* GJ 1002 (15.8060±0.0036 ly)
* 2 planets: b, c
* Gliese 412 (15.9969±0.0026 ly)
* red dwarf B
* AD Leonis (16.1939±0.0024 ly)
* Gliese 832 (16.2005±0.0019 ly)
* planet b
* Gliese 682 (16.3328±0.0026 ly)
* 2? planets: b?, c?
* EV Lacertae (16.4761±0.0018 ly)
* G 9-38 (16.800±0.011 ly)
* red dwarf B
* GJ 3379 (16.9861±0.0027 ly)
* Gliese 445 (17.1368±0.0017 ly)
* 2M1540 (17.3738±0.0046 ly)
* GJ 3323 (17.5309±0.0026 ly)
* 2 planets: b, c
* Gliese 526 (17.7263±0.0024 ly)
* Stein 2051 (17.9925±0.0020 ly)
* white dwarf B
* Gliese 251 (18.2146±0.0028 ly)
* planet b
* LP 816-60 (18.3305±0.0038 ly)
* LSR J1835+3259 (18.5534±0.0049 ly)
* Gliese 205 (18.6042±0.0022 ly)
* Gliese 229 (18.7906±0.0018 ly)
* T-type brown dwarf B
* 2 planets: Ab, Ac
* Ross 47 (18.8883±0.0031 ly)
* Gliese 693 (19.2078±0.0053 ly)
* Gliese 754 (19.2724±0.0067 ly)
* Gliese 908 (19.2745±0.0032 ly)
* Gliese 752 (19.2922±0.0027 ly)
* red dwarf B (vB 10)
* planet Ab
* Gliese 588 (19.2996±0.0031 ly)
* 2? planets: b?, c?
* YZ Canis Minoris (19.5330±0.0040 ly)
* GJ 1005 (19.577±0.035 ly)
* red dwarf B
* Gliese 268 (19.7414±0.0076 ly)
* red dwarf B

| Degenerate
stars|

| White dwarfs|

* LP 145-141 (15.1226±0.0013 ly)

|

| Brown dwarfs|

| L-type|

* DENIS 0255−4700 (15.877±0.014 ly)

|

T-type|

* WISE 1741+2553 (15.22±0.20 ly)
* WISE 1506+7027 (16.856±0.052 ly)
* DENIS 0817-6155 (17.002±0.037 ly)
* 2MASS 0939-2448 (17.41±0.44 ly)
* T-type brown dwarf B
* 2MASS 1114-2618 (18.20±0.14 ly)
* 2MASS 0415-0935 (18.62±0.18 ly)
* SIMP0136 (19.955±0.057 ly)
* 2MASS 0937+2931 (19.96+0.22
−0.21 ly)

Y-type|

* WISE 1639−6847 (15.450±0.041 ly)
* WISE 0350−5658 (18.49±0.24 ly)

| Sub-brown dwarfs
and rogue planets|

| Y-type|

* WISE 1541−2250 (19.54±0.24 ly)

|

* v
* t
* e

Constellation of Piscis Austrinus

* List of stars in Piscis Austrinus
* Piscis Austrinus in Chinese astronomy

Stars|

| Bayer|

* α (Fomalhaut)
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* λ
* μ
* π
* τ
* υ

|

Flamsteed|

* 5
* 6
* 7
* 8
* 11
* 13
* 19
* 20
* 21

Variable|

* RW
* TW (Fomalhaut B)
* TY
* UU
* VZ
* WX

HD|

* 205739 (Sāmaya)
* 207832
* 216770
* 217987

| Exoplanets|

* HD 205739 b (Samagiya)
* HD 216770 b

|

Galaxies|

| NGC|

* 7130
* 7172
* 7259
* 7314

|

Other|

* BDF-521
* BDF-3299
* PKS 2155-304

| Galaxy clusters|

* Abell S1077

|

| Astronomical events|

* SN 2009ip
* Fomalhaut b (Dagon)

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template
*[Primary]: Primary member of a system is the brightest one (and, in most cases, also the most massive one).