HD 1461
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 18m 41.87s[1] |
| Declination | −08° 03′ 10.8″[1] |
| Apparent magnitude (V) | 6.46[2] |
| Characteristics | |
| Spectral type | G0V |
| Apparent magnitude (B) | 7.14 |
| Apparent magnitude (J) | 5.329 |
| Apparent magnitude (H) | 5.041 |
| Apparent magnitude (K) | 4.897 |
| U−B color index | 0.29 |
| B−V color index | 0.68 |
| V−R color index | 0.35 |
| R−I color index | 0.32 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | −10.7 km/s |
| Proper motion (μ) | RA: 416.87 ± 0.63[1] mas/yr Dec.: -143.83 ± 0.26[1] mas/yr |
| Parallax (π) | 43.02 ± 0.51[1] mas |
| Distance | 75.8 ± 0.9 ly (23.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 4.63 ± 0.03 [3] |
| Details | |
| Mass | 1.08 (± 0.04) M☉ |
| Radius | 1.095 (± 0.026) R☉ |
| Luminosity | 1.188 L☉ |
| Surface gravity (log g) | 4.39 cgs |
| Temperature | 5765 (± 18) K |
| Metallicity | 0.19 (± 0.01) |
| Age | 2.5[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
HD 1461 (32 G. Ceti) is a G0V class star slightly more massive than the Sun (G2V), and located about 76 light-years away in the constellation of Cetus.
Planetary system
On 14 December 2009, scientists announced the discovery at least one planet orbiting around HD 1461.[6][7] The planet, a super-Earth with a 5.8-day orbit was designated HD 1461 b. The data also contained evidence for additional planets with orbital periods of around 400 and 5000 days but the star showed small variations with similar periods, casting doubt on the interpretation of these signals as being caused by orbiting planets.
In September 2011, a paper was published on the arXiv pre-print server giving an orbital solution incorporating data from the HARPS spectrograph. This solution recovered the previously-known planet HD 1461 b, and an additional planet in a 13.5-day orbit.[8] No mention was made of the proposed 400 and 5000-day candidates. As of June 2014, this paper has not yet been published in a refereed scientific journal.
Other than HD 1461 b, the designations for the planets are inconsistent: in the original paper, Rivera et al. designated the 400 and 5000-day candidates as "c" and "d" respectively, whereas the Mayor et al. (2011) pre-print uses the "c" designation for the 13.5-day planet and does not mention the 400-day or 5000-day planets at all.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b[6] | 7.4 ± 1.2 M⊕ | 0.063437 ± 0.000019 | 5.7726 ± 0.0026 | 0 | — | — |
| c[8] | 5.92 ± 0.76 M⊕ | 0.1117 ± 0.0018 | 13.505 ± 0.004 | 0 | — | — |
See also
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ↑ "HD 1461". SIMBAD Astronomical Database. Retrieved 2009-12-25.
- ↑ Holmberg; et al. (2009). "HD 1461". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-12-04.
- ↑ Barry, Don C.; Cromwell, Richard H.; Hege, E. Keith (April 1987), "Chromospheric activity and ages of solar-type stars", Astrophysical Journal, Part 1 315: 264–272, Bibcode:1987ApJ...315..264B, doi:10.1086/165131
- ↑ Gould, B. (1879). "32G Ceti". Uranometria Argentina. Retrieved 2012-05-24.
- 1 2 Rivera, Eugenio J.; et al. (2010). "A Super-Earth Orbiting the Nearby Sun-like Star HD 1461". The Astrophysical Journal 708 (2): 1492–1499. arXiv:0912.2566. Bibcode:2010ApJ...708.1492R. doi:10.1088/0004-637X/708/2/1492.
- ↑ Tim Stephens (2009-12-14). "New planet discoveries suggest low-mass planets are common around nearby stars". UCSC News. UC Santa Cruz. Retrieved 2009-12-14.
- 1 2 Mayor; et al. (September 2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497.
Notes
- ↑ Mayor et al. (arXiv, 2011) do not list the full set of parameters for HD 1461 b, though table 3 indicates that they are using a circular orbit solution. The parameters for planet b are taken from the 1-planet circular orbital solution in Rivera et al. (2010) instead.
External links
- Aladin image of HD 1461
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Coordinates: 
00h 18m 41.62s, −8° 03′ 9.5″
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