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23 Librae System |
Stellar Information
| Other Names | Gliese 579.4, HD 134987, CD-24°11928, HIP 74500, SAO 183275, HR 5657 |
| Distance from Sol | 83.7 light years (Hipparcos) |
| Spectral Type | G5 V |
| Mass (xSol) | 1.05 |
| Luminosity (xSol) | 1.51 |
| Diameter (xSol) | |
| Metallicity (xSol) | 1.7 ( HD 134987 at exoplanets.org) |
| Age | 9.0 billion years |
| Habitable Zone | 1.23 AU |
Planetary Information
| Other Names | 23 Librae b |
| Common Name | None |
| Detection Method | Radial-Velocity (Vogt et al, 2000) |
| Detection Date | 1999 |
| Mass (xJupiter) | 1.6 |
| Diameter | Unknown |
| Semi-Major Axis | 0.81 AU |
| Orbital Period | 260 days |
| Orbital Eccentricity | 0.24 |
| Orbital Inclination | Unknown |
| Notes | Subsequent astrometric analysis, however, suggests that planet b may have as much as 34 times the mass of Jupiter with an inclination of 2.7° from Earth's line of sight (Han et al, 2000). Thus, the "planet" could be an extremely dim brown dwarf, substellar companion of 23 Librae. The authors consider their analysis to be preliminary, needing confirmation with additional astrometric as well as other observations. |
A comparison of the orbits of 16 Cygni B b (above), and the Inner Solar System (top) (image generated with Celestia).
A hypothetical view of 16 Cygni B b. Jupiter-like in appearance, the planet could actually be wearing almost any face. (image generated with Celestia).
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Updates January 22, 2005: Established this page. |
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© John M. Dollan
2005 This Page first uploaded January 22, 2005 Most recent update for this page January 22, 2005 |