astro.wikisort.org - Star38 Virginis is an F-type main sequence star in the constellation of Virgo. It is around 108 light years distant from the Earth.[2][1]
F-type main sequence star in the constellation Virgo
38 Virginis
Observation data Epoch J2000.0 Equinox J2000.0 |
Constellation |
Virgo |
Right ascension |
12h 53m 11.1564s[1] |
Declination |
−03° 33′ 11.1482″[1] |
Apparent magnitude (V) |
6.11 |
Characteristics |
Spectral type |
F6V[2] |
B−V color index |
0.49[2] |
Astrometry |
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|
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Proper motion (μ) | RA: −262.638±0.113[1] mas/yr Dec.: −3.853±0.100[1] mas/yr |
Parallax (π) | 30.0702 ± 0.0541 mas[1] |
Distance | 108.5 ± 0.2 ly (33.26 ± 0.06 pc) |
Absolute magnitude (MV) | 6.11 |
|
Details |
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|
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Mass | 1.18 ± 0.12[2] M☉ |
Radius | 1.45 ± 0.07[2] R☉ |
Luminosity | 3.48[note 1] L☉ |
Temperature | 6557 ± 96[2] K |
Metallicity [Fe/H] | 0.07[2] dex |
Age | 1.9+0.6 −0.7[2] Gyr |
|
Other designations |
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BD−02 3593, HD 111998, HIP 62875, HR 4891, WDS J12532-0333AB[3] |
Database references |
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SIMBAD | data |
Nomenclature
The name 38 Virginis derives from the star being the 38th star in order of right ascension catalogued in the constellation Virgo by Flamsteed in his star catalogue. The designation b of 38 Virginis b derives from the order of discovery and is given to the first planet orbiting a given star, followed by the other lowercase letters of the alphabet.[4] In the case of 38 Virginis, only one was discovered, which was designated b.[2]
Stellar characteristics
38 Virginis is an F-type main sequence star that is approximately 118% the mass of and 145% the radius of the Sun. It has a temperature of 6557 K and is about 1.9 billion years old. In comparison, the Sun is about 4.6 billion years old[5] and has a temperature of 5778 K.[6]
The star is metal-rich, with a metallicity ([Fe/H]) of 0.07 dex, or 117% the solar amount. Its luminosity (L☉) is 3.48 times that of the Sun.
A companion star is cataloged in the CCDM at a separation of half an arcsecond.[7]
Planetary system
The 38 Virginis planetary system[2]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
b |
4.51 ± 0.5 MJ |
1.82 ± 0.07 |
825.9 ± 6.2 |
0.03 ± 0.04 |
— |
~4.51 RJ |
The star is known to host one exoplanet, 38 Virginis b, discovered in 2016. This planet has a relatively low eccentricity out of any long-period giant exoplanet discovered, with an eccentricity of 0.03. The planet has a mass of around 4.5 times that of the planet Jupiter.[2] Its orbit very likely puts it and any moons it may have in the habitable zone of its star.[citation needed]
Notes
- From
, where
is the luminosity,
is the radius,
is the effective surface temperature and
is the Stefan–Boltzmann constant.
References
- 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.
- Borgniet, S.; et al. (2017). "Extrasolar planets and brown dwarfs around AF-type stars. IX. The HARPS southern sample". Astronomy and Astrophysics. 599. A57. arXiv:1608.08257. Bibcode:2017A&A...599A..57B. doi:10.1051/0004-6361/201628805. S2CID 118723455.
- "38 Virginis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-19.
- Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
- Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
- Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
- J. Dommanget; et al. (February 2002), Catalog of Components of Double & Multiple Stars, Observations et Travaux, Societe Astronomique de France
Virgo constellation |
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Stars (list) | |
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Star clusters | |
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Nebulae | |
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Galaxies | Messier | |
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NGC | |
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Other |
- A1689-zD1
- Abell 1835 IR1916
- Arp 240 (NGC 5257 and NGC 5258)
- Arp 271 (NGC 5426 and NGC 5427)
- BR 1202-0725
- 3C 273
- 3C 279
- 3C 298
- 4C 04.42
- Eyes Galaxies
- GR 8
- IC 1011
- IC 1101
- IC 3258
- IC 3328
- IRAS 12212+0305
- IRAS 13197−1627
- M60-UCD1
- Markarian 50
- Markarian 1318
- PG 1216+069
- PG 1244+026
- PG 1254+047
- PG 1307+085
- PG 1416−129
- PG 1426+015
- PKS 1148-001
- PKS 1167+014
- PKS 1217+023
- PKS 1229−021
- PKS 1302−102
- PKS 1335−127
- PKS 1402+044
- PKS 1405−076
- QSO B1208+1011
- QSO B1243−072
- QSO B1246−057
- QSO B1331+170
- RXJ1242−11
- SMM J14011+0252
- UM 448
- UM 461
- UM 462
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Galaxy clusters | |
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Other |
- GRB 930131
- GRB 030328
- GRB 050408
- GRB 050801
- GRB 080310
- North Polar Spur
- SN 1960F
- SN 1981B
- SN 1990B
- SN 1990N
- SN 1991T
- SN 1991bg
- SN 1994D
- SN 1999br
- SN 2002cx
- SN 2007bi
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На других языках
- [en] 38 Virginis
[ru] 38 Девы
38 Девы (HD 111998, лат. 38 Virginis) — звезда в созвездии Дева, которая находится на расстоянии около 107 световых лет от Солнца. Вокруг звезды обращается, как минимум, одна планета.
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