HR 4523
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Centaurus |
| Right ascension | 11h 46m 31.0720s |
| Declination | -40° 30′ 01.274″ |
| Apparent magnitude (V) | 4.89/15 |
| Characteristics | |
| Spectral type | G5V |
| U-B color index | 0.10 |
| B-V color index | 0.66 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | 15.3±0.9 km/s |
| Proper motion (μ) | RA: -1531.62 mas/yr Dec.: 403.48 mas/yr |
| Parallax (π) | 108.23 ± 0.70 mas |
| Distance | 30.1 ± 0.2 ly (9.24 ± 0.06 pc) |
| Details | |
| Mass | 0.7[1] M☉ |
| Radius | ? R☉ |
| Luminosity | 0.85[2] L☉ |
| Temperature | 5,643[2] K |
| Metallicity | [Fe/H]=-0.28[2] |
| Rotation | ? |
| Age | >7 Gyr[2] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 4523 is a binary star system that is located in the constellation of Centaurus. The larger member of the system is a G-type star that is smaller than the Sun but of similar mass. It is orbited by a faint M-type star at an average separation of about 235 Astronomical Units (A.U.), (or 235 times the separation of the Earth from the Sun). By comparison, Neptune orbits at an average distance of 30 A.U.
No planetary companions have yet been discovered in orbit around either member of this star system, as they display no variability in radial velocity.[2] It is a member of the Epsilon Indi Moving Group, although it is most likely an interloper. (The star is older and has a different composition than the other group members.)[1]
[edit] References
- ^ a b Kovacs, N.; Foy, R. (1978). "A detailed analysis of three stars in the Eggen's Epsilon INDI moving group". Astronomy and Astrophysics 68 (1-2): 27–31.
- ^ a b c d e Porto de Mello, G.; del Peloso, E. F.; Ghezzi, L. (2006). "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun". Astrobiology 6 (2): 308–331. doi:.
