| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 34m 29.48628s [1] |
| Declination | –32° 49′ 52.8199″ [1] |
| Apparent magnitude (V) | 5.97 [2] + 15 |
| Characteristics | |
| Spectral type | K0 V [3] + DC8 [4] |
| U−B color index | 0.325 [2] |
| B−V color index | 0.80 [2] |
| V−R color index | 0.44 |
| R−I color index | 0.40 |
| Astrometry | |
| Radial velocity (Rv) | –22.21 [5] km/s |
| Proper motion (μ) |
RA: –670.120
[1]
mas/
yr Dec.: +822.228 [1] mas/ yr |
| Parallax (π) | 104.7828 ± 0.0518 mas [1] |
| Distance | 31.13 ± 0.02
ly (9.544 ± 0.005 pc) |
| Absolute magnitude (MV) | 6.05 [6] |
| Details | |
| HR 4458 A | |
| Radius | 0.84 [7] R☉ |
| Luminosity (bolometric) | 0.368 [8] L☉ |
| Surface gravity (log g) | 4.59 [9] cgs |
| Temperature | 5,241 [9] K |
| Metallicity [Fe/H] | –0.37 [9] dex |
| Rotational velocity (v sin i) | 6.79 [10] km/s |
| Age | 4.6–5.8 [11] Gyr |
| Other designations | |
| WD 1132-325: VB 04 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 4458 is a binary star system in the equatorial constellation of Hydra. It has the Gould designation 289 G. Hydrae; HR 4458 is the Bright Star Catalogue designation. At a distance of 31.13 light years, it is the closest star system to the Solar System within this constellation. This object is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.97. [2] It is moving closer to the Earth with a heliocentric radial velocity of −22 km/s. [5]
The primary component is K-type main-sequence star with a stellar classification of K0 V. [3] It is around five [11] billion years old with 84% [7] of the Sun's radius. The star is radiating 37% [8] of the Sun's luminosity from its photosphere at an effective temperature of 5,241 K. [9] It has been examined for the presence of an infrared excess, but none was detected. [8]
There is a common proper motion companion at an angular separation of 16.2″, [4] corresponding to a projected separation of 162.5 AU. [13] This is a white dwarf star with a classification of DC8. [4] The orbital period of the pair is estimated as 1,110 years. [13]
References
- ^ a b c d e 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.
- ^ a b c d Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ^ a b Gray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–70. arXiv: astro-ph/0603770. Bibcode: 2006AJ....132..161G. doi: 10.1086/504637. S2CID 119476992.
- ^ a b c Holberg, J. B.; et al. (November 2013). "Where are all the Sirius-like binary systems?". Monthly Notices of the Royal Astronomical Society. 435 (3): 2077–2091. arXiv: 1307.8047. Bibcode: 2013MNRAS.435.2077H. doi: 10.1093/mnras/stt1433.
- ^ a b Nidever, David L.; et al. (August 2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv: astro-ph/0112477. Bibcode: 2002ApJS..141..503N. doi: 10.1086/340570. S2CID 51814894.
- ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv: 0811.3982, Bibcode: 2009A&A...501..941H, doi: 10.1051/0004-6361/200811191, S2CID 118577511.
- ^ a b Johnson, H. M.; Wright, C. D. (183). "Predicted infrared brightness of stars within 25 parsecs of the sun". Astrophysical Journal Supplement Series. 53 (2): 643–711. Bibcode: 1983ApJS...53..643J. doi: 10.1086/190905.
- ^ a b c Eiroa, C.; et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics. 555: A11. arXiv: 1305.0155. Bibcode: 2013A&A...555A..11E. doi: 10.1051/0004-6361/201321050. S2CID 377244.
- ^ a b c d Ramírez, I.; et al. (September 2012). "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets". The Astrophysical Journal. 756 (1): 46. arXiv: 1207.0499. Bibcode: 2012ApJ...756...46R. doi: 10.1088/0004-637X/756/1/46. S2CID 119199829.
- ^ Martínez-Arnáiz, R.; et al. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF). Astronomy and Astrophysics. 520: A79. arXiv: 1002.4391. Bibcode: 2010A&A...520A..79M. doi: 10.1051/0004-6361/200913725. S2CID 43455849. Archived from the original (PDF) on 2017-09-22. Retrieved 2018-11-04.
- ^ a b Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. arXiv: 0807.1686. Bibcode: 2008ApJ...687.1264M. doi: 10.1086/591785. S2CID 27151456.
- ^ "HD 100623". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 6, 2019.
- ^ a b Rodriguez, David R.; et al. (2015). "Stellar multiplicity and debris discs: An unbiased sample". Monthly Notices of the Royal Astronomical Society. 449 (3): 3160. arXiv: 1503.01320. Bibcode: 2015MNRAS.449.3160R. doi: 10.1093/mnras/stv483.
External links
- "CD-32 8179 / HR 4458 AB". SolStation. Archived from the original on 2012-10-13. Retrieved 2007-06-06.