HR 4458
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Hydra |
| Right ascension | 11h 34m 29.4871s |
| Declination | -32° 49′ 52.823″ |
| Apparent magnitude (V) | 5.98/15 |
| Characteristics | |
| Spectral type | K0 V |
| U-B color index | 0.33 |
| B-V color index | 0.80 |
| V-R color index | 0.44 |
| R-I color index | 0.40 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | -22.6 km/s |
| Proper motion (μ) | RA: -670.99 mas/yr Dec.: 823.89 mas/yr |
| Parallax (π) | 104.84 ± 0.81 mas |
| Distance | 31.1 ± 0.2 ly (9.54 ± 0.07 pc) |
| Absolute magnitude (MV) | 6.09/15 |
| Details | |
| Radius | 0.84/0.15[1] R☉ |
| Surface gravity (log g) | 4.6[2]/– |
| Temperature | 5400[2]/2960[1] K |
| Metallicity | [Fe/H] = -0.26[2] |
| Other designations | |
|
VB 4, GJ 432, HR 4458, CD -32°8179, HD 100623, LHS 308, LTT 4280, GCTP 2678.00, SAO 202583, HIP 56452.
|
|
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 4458 is a binary star system in the constellation Hydra. At a distance of 31 light years, they are the closest stars to the solar system within this constellation. The pair have an angular separation of 16.2″.[3]
[edit] References
- ^ 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. doi:.
- ^ a b c Flynn, C.; Morell, O. (1997). "Metallicities and kinematics of G and K dwarfs". Monthly Notices of the Royal Astronomical Society 286 (2): 617–625.
- ^ Poveda, A.; Herrera, M. A.; Allen, C.; Cordero, G.; Lavalley, C. (1994). "The new astrometry". Revista Mexicana de Astronomia y Astrofisica 28: 43–89.
[edit] External links
- CD-32 8179 / HR 4458 AB. SolStation. Retrieved on 2007-06-06.
- NS 1134-3249. Nearby Stars Database. NASA. Retrieved on 2007-06-06.
