Planet Candidates With Incomplete or Poorly-constrained Orbits
The following planet candidates have been detected indirectly (e.g. by the radial velocity method) but have not yet had sufficient observations to constrain their orbital properties, either because the planet has not yet completed a full orbit during the time of observation, or because the measurements are too sparse. The parameters given in this table are thus preliminary: further observations of these systems may result in significant changes.
| Star | Constellation | Right ascension |
Declination | Distance |
Planet | Mass |
Orbital period |
Semimajor axis |
Orbital eccentricity |
Discovery year |
Ref | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HD 1461 | Cetus | 00h 18m 42s | −08° 03′ 11″ | 76 | d | ≥0.072 | 454 | 1.165 | 0.74 | 2009 | The present day (2009) radial velocity method is hard to find Neptune-mass planets at more than 1 AU away from the stars. | |
| HD 1461 | Cetus | 00h 18m 42s | −08° 03′ 11″ | 76 | e | ≥0.3 | 5000 | 5 | 0.16 | 2009 | All parameters for this planet are very poorly constrained. | |
| GD 66 | Auriga | 05h 20m 38s | +30° 48′ 24″ | 170 | b | ≥2.36 | 2080 | 2.75 | ~0 | 2009 | Partial orbit coverage | |
| Gliese 317 | Pyxis | 08h 40m 59s | −23° 27′ 23″ | 29.9 | c | ≥0.83 | ~2700 | 0.42 | 2007 | 2-planet solution modifies parameters of (confirmed) planet b. |
- This list is incomplete; you can help by expanding it.
Read more about this topic: List Of Unconfirmed Extrasolar Planets
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