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38 Virginis
View on Wikipedia| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo[1] |
| Right ascension | 12h 53m 11.15678s[2] |
| Declination | −03° 33′ 11.1513″[2] |
| Apparent magnitude (V) | 6.135±0.037[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F6V[4] |
| B−V color index | 0.49[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.30±0.32[5] km/s |
| Proper motion (μ) | RA: −262.971 mas/yr[2] Dec.: −3.649 mas/yr[2] |
| Parallax (π) | 29.9081±0.0377 mas[2] |
| Distance | 109.1 ± 0.1 ly (33.44 ± 0.04 pc) |
| Details | |
| Mass | 1.18±0.12[4] M☉ |
| Radius | 1.45±0.07[4] R☉ |
| Luminosity | 3.22[6] L☉ |
| Temperature | 6557±96[4] K |
| Metallicity [Fe/H] | +0.07[4] dex |
| Rotation | 8.2 days[7] |
| Rotational velocity (v sin i) | 28.43[8] km/s |
| Age | 1.9+0.6 −0.7[4] Gyr |
| Other designations | |
| BD−02 3593, HD 111998, HIP 62875, HR 4891, WDS J12532-0333[9] | |
| Database references | |
| SIMBAD | data |
38 Virginis is an F-type main sequence star in the constellation of Virgo. With an apparent magnitude of 6.135,[3] it is very close to the average threshold for naked eye visibility, and can only be viewed from sufficiently dark skies, far from light pollution.[10] It is around 109.1 light years distant from the Earth.[2]
Nomenclature
[edit]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.[11] In the case of 38 Virginis, only one was discovered, which was designated b.[4]
Characteristics
[edit]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[12] and has a temperature of 5778 K.[13]
The star is metal-rich, with a metallicity ([Fe/H]) of 0.07 dex, or 117% the solar amount. Its luminosity (L☉) is 3.22 times that of the Sun.
A companion star is cataloged in the CCDM at a separation of half an arcsecond.[14]
Planetary system
[edit]| 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 | — | — |
The star is known to host one exoplanet, 38 Virginis b, discovered in 2016. It has a mass of around 4.5 times that of the planet Jupiter, an orbital period of 825.9 days (2.261 years) and a relatively low eccentricity out of any long-period giant exoplanet discovered, with an eccentricity of 0.03.[4]
The planet lies within the host star's habitable zone. As of 2024[update], it is the only known planet around an F-type star that is always orbiting inside the habitable zone, as opposed to an orbit that never or just occasionally crosses the HZ.[15]
Notes
[edit]
References
[edit]- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Paunzen, E. (2015-08-01). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy and Astrophysics. 580: A23. arXiv:1506.04568. Bibcode:2015A&A...580A..23P. doi:10.1051/0004-6361/201526413. ISSN 0004-6361.
- ^ a b c d e f g h i j 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.
- ^ 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.
- ^ Hill, Michelle L.; Bott, Kimberly; Dalba, Paul A.; Fetherolf, Tara; Kane, Stephen R.; Kopparapu, Ravi; Li, Zhexing; Ostberg, Colby (2023). "A Catalog of Habitable Zone Exoplanets". The Astronomical Journal. 165 (2): 34. Bibcode:2023AJ....165...34H. doi:10.3847/1538-3881/aca1c0.
- ^ Fuhrmeister, B.; Czesla, S.; Robrade, J.; González-Pérez, J. N.; Schneider, C.; Mittag, M.; Schmitt, J. H. M. M. (2022). "The corona - chromosphere connection studied with simultaneous eROSITA and TIGRE observations". Astronomy and Astrophysics. 661: A24. arXiv:2106.14546. Bibcode:2022A&A...661A..24F. doi:10.1051/0004-6361/202141020.
- ^ Freckelton, Alix Violet; Mortier, Annelies; Bedell, Megan; Morrell, Sam; Naylor, Tim; Buchhave, Lars A.; Davies, Guy R.; González Hernández, J. I.; Klein, Baptiste; De Mooij, Ernst J. W.; Passegger, Vera Maria; Quirrenbach, Andreas; Roy, Arpita; Santos, Nuno C.; Sousa, Sérgio G.; Suárez Mascareño, A.; Tsantaki, Maria; Zhao, Lily L. (2025). "Gr8stars – I. A homogeneous spectroscopic study of bright FGKM dwarfs and a public library of their high-resolution spectra". Monthly Notices of the Royal Astronomical Society. 540 (2): 1786. arXiv:2505.12945. Bibcode:2025MNRAS.540.1786F. doi:10.1093/mnras/staf825.
- ^ "38 Virginis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-19.
- ^ "Limiting Magnitude | COSMOS". astronomy.swin.edu.au. Retrieved 2025-06-01.
- ^ 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
- ^ Patel, Shaan D.; Cuntz, Manfred; Weinberg, Nevin N. (September 2024). "Statistics and Habitability of F-type Star–Planet Systems". The Astrophysical Journal Supplement Series. 274 (1): 20. arXiv:2407.15826. Bibcode:2024ApJS..274...20P. doi:10.3847/1538-4365/ad65eb. ISSN 0067-0049.
