# HR 4458

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Binary star system in the constellation Hydra

HR 4458 Location of 20 Crateris (circled in red) Observation data Epoch J2000 Equinox ICRS Constellation Hydra[1] A Right ascension 11h 34m 29.48644s[2] Declination −32° 49′ 52.8228″[2] Apparent magnitude (V) 5.97[3] B Right ascension 11h 34m 30.47776s[4] Declination −32° 50′ 02.4048″[4] Apparent magnitude (V) 15[5] Characteristics A Evolutionary stage main sequence[2] Spectral type K0 V[6] U−B color index +0.325[3] B−V color index +0.80[3] B Evolutionary stage white dwarf[5] Spectral type DC8[7] Astrometry A Radial velocity (Rv) −22.09±0.12[2] km/s Proper motion (μ) RA: −670.230 mas/yr[2] Dec.: +822.399 mas/yr[2] Parallax (π) 104.6133±0.0277 mas[2] Distance 31.177 ± 0.008 ly (9.559 ± 0.003 pc) Absolute magnitude (MV) 6.05[8] B Proper motion (μ) RA: –701.802 mas/yr[4] Dec.: +828.928 mas/yr[4] Parallax (π) 104.6570±0.0267 mas[4] Distance 31.164 ± 0.008 ly (9.555 ± 0.002 pc) Absolute magnitude (MV) 15[9] Orbit[10] Period (P) 1,400+600 −510 yr Semi-major axis (a) 142+38 −37 au Eccentricity (e) 0.28+0.57 −0.22 Inclination (i) 83.4+2.1 −7.1° Details HR 4458 A Mass 0.900+0.044 −0.045[10] M☉ Radius 0.84[11] R☉ Luminosity (bolometric) 0.368[12] L☉ Surface gravity (log g) 4.59[13] cgs Temperature 5,241[13] K Metallicity [Fe/H] −0.37[13] dex Rotational velocity (v sin i) 6.79[14] km/s Age 4.6–5.8[15] Gyr HR 4458 B Mass 0.554±0.022[10] M☉ Luminosity (bolometric) 0.000088[16] L☉ Surface gravity (log g) 8.12[17] cgs Temperature 5,000[18] K Age 5.69[18][a] Gyr Other designations 20 Crt, 289 G. Hya, CD−32°8179, GJ 432, HD 100623, HIP 56452, HR 4458, SAO 202583, LHS 308, LTT 4280, PLX 2678.00[19] B: VB 4, WD 1132−325 Database references SIMBAD A B ARICNS data

**HR 4458** (**HD 100623**) is a [binary star](/source/Binary_star) [system](/source/System) 31.18 [light-years](/source/Light-year) away in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) of [Hydra](/source/Hydra_(constellation)). It has the [Flamsteed designation](/source/Flamsteed_designation) **20 Crateris**[20] and the [Gould designation](/source/Gould_designation) **289 G. Hydrae**;[21] the former refers to the constellation [Crater](/source/Crater_(constellation)), since Flamsteed numbered the stars of Crater and the central portion of Hydra as a separate constellation from the other parts of Hydra.[20] This object is visible to the naked eye as a dim, orange-hued star with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.97.[3] It is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −22 km/s.[22]

The primary component is a [K-type main-sequence star](/source/K-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of K0 V.[6] It is around five billion years old[15] with 90% of the [Sun's mass](/source/Sun's_mass)[10] and 84% of the [Sun's radius](/source/Sun's_radius).[11] The star is radiating 37% of the [Sun's luminosity](/source/Sun's_luminosity)[12] from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 5,241 K.[13] It has been examined for the presence of an [infrared excess](/source/Infrared_excess), but none was detected.[12]

The secondary, designated VB 4, is a 15th-magnitude [white dwarf](/source/White_dwarf) of class DC8 sharing [common proper motion](/source/Common_proper_motion) with the primary.[7][23] The orbital period of the pair is of 1,400 years, albeit with large uncertainty.[10]

## Notes

1. **[^](#cite_ref-cooling_19-0)** [Cooling age](/source/Cooling_age)

## References

1. **[^](#cite_ref-constellation_1-0)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=HR+4458&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

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## External links

- ["CD-32 8179 / HR 4458 AB"](https://web.archive.org/web/20121013003737/http://www.solstation.com/stars/hr4458ab.htm). SolStation. Archived from [the original](http://www.solstation.com/stars/hr4458ab.htm) on 2012-10-13. Retrieved 2007-06-06.

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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Adapted from the Wikipedia article [HR 4458](https://en.wikipedia.org/wiki/HR_4458) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HR_4458?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.