HR 511
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Cassiopeia |
| Right ascension | 01h 47m 44.83s |
| Declination | +63° 51′ 09.0″ |
| Apparent magnitude (V) | 5.63 |
| Characteristics | |
| Spectral type | K0 V |
| U-B color index | 0.41 |
| B-V color index | 0.81 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +2.8 km/s |
| Proper motion (μ) | RA: 582.03 mas/yr Dec.: −246.86 mas/yr |
| Parallax (π) | 100.24 ± 0.68 mas |
| Distance | 32.5 ± 0.2 ly (9.98 ± 0.07 pc) |
| Absolute magnitude (MV) | 5.64 |
| Details | |
| Mass | 0.85[1] M☉ |
| Radius | 0.83[2] R☉ |
| Luminosity | 0.53[3] L☉ |
| Temperature | 5420[3] K |
| Metallicity | 95.5%[4] |
| Rotation | 21.67 days (2 km/s)[3] |
| Age | 2.3-4 × 109[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 511 (also designated Gliese 75 among others) is an orange dwarf of spectral type K0V in the constellation Cassiopeia. The star is relatively close, 32.5 light years from the Sun.
This star is estimated to be about the same age as the sun. It has not been identified as a member of any moving star groups. This star has displayed unusual emissions of Ca II and is much more x-ray luminous than the Sun. It is considered a relatively active star.[3] Based on an iron abundance of [-0.02], the metallicity of this star appears to be similar to that of the Sun.[4]
[edit] References
- ^ H. M. Johnson, C. D. Wright (1983). "Predicted infrared brightness of stars within 25 parsecs of the sun". Astrophysical Journal Supplement Series 53: 643–711. doi:.
- ^ Approximating the star as a black body, then RHR 511 / RSun = (TSun/THR 511)2 × ( LHR 511 / LSun )0.5 = 1.14 × 0.73 = 0.83
- ^ a b c d e E. J. Gaidos, G. W. Henry, S. M. Henry (2000). "Spectroscopy and Photometry of Nearby Young Solar Analogs" ([dead link]). The Astronomical Journal 120 (2): 1006–1013. doi:.
- ^ a b S. Feltzing, G. Gonzalez (2001). "The nature of super-metal-rich stars. Detailed abundance analysis of 8 super-metal-rich star candidates". Astronomy and Astrophysics 367: 253–265. doi:.
[edit] External links
- ARICNS 4C00155. ARI Data Base for Nearby Stars. Astronomisches Rechen-Institut (March 4, 1998). Retrieved on 2008-02-27.
- SolStation
