| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 00h 18m 41.8674s[2] |
| Declination | −08° 03′ 10.806″[2] |
| Apparent magnitude (V) | 6.47[3] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G3VFe0.5[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.14±0.09[3] km/s |
| Proper motion (μ) | RA: 417.875±0.098[2]mas/yr Dec.: −143.768±0.054[2]mas/yr |
| Parallax (π) | 42.6090±0.0557 mas[2] |
| Distance | 76.5 ± 0.1 ly (23.47 ± 0.03 pc) |
| Absolute magnitude (MV) | 4.63±0.03[5] |
| Details | |
| Mass | 1.05±0.02[6] M☉ |
| Radius | 1.2441±0.0305[7] R☉ |
| Luminosity | 1.1893±0.0476[7] L☉ |
| Surface gravity (log g) | 4.39 cgs |
| Temperature | 5,386±60[7] K |
| Metallicity[Fe/H] | 0.18±0.01[6] dex |
| Rotational velocity (v sin i) | 4.8[8] km/s |
| Age | 2.0±1.1[6] Gyr |
| Other designations | |
| 32 G. Ceti[9],BD−08°38,GJ 16.1,HD 1461,HIP 1499,HR 72,SAO 128690,PPM 182101,LTT 149,NLTT 950,GCRV 50265,2MASS J00184182-0803105[10] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
HD 1461 is astar in theequatorialconstellation ofCetus, near the western constellation border withAquarius. It has theGould designation 32 G. Ceti,[9] while HD 1461 is theHenry Draper Catalogue identifier. This object has a yellow hue and is a challenge to view with the naked eye, having anapparent visual magnitude of 6.47.[3] The star is located at a distance of 76.5 light-years (23.5 parsecs) from theSun based onparallax,[2] but is drifting closer with aradial velocity of −10 km/s.[3]
This object is aG-type main-sequence star with astellar classification of G3VFe0.5,[4] where the suffix notation indicates a mild overabundance of iron. It is roughly two[6] billion years old and is spinning with aprojected rotational velocity of 5 km/s.[8] This is asolar-type star with 5% greater mass compared to the Sun and 1.24 times theSun's radius. The star is radiating 1.19[7] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,386 K.[7]
On 14 December 2009, scientists announced the discovery at least oneplanet orbiting around HD 1461.[11][12] The planet, a super-Earth with a 5.8-day orbit was designatedHD 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 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.[13] The 13.5-day planet HD 1461 c was confirmed in 2015.[14]
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.
HD 1461 b has a mass 6.44 times that of theEarth while HD 1461 c has a mass times 5.59 that of theEarth.[14]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.44±0.61 M🜨 | 0.0634±0.0022 | 5.77152±0.00045 | <0.131 | — | — |
| c | ≥5.59±0.73 M🜨 | 0.1117±0.0039 | 13.5052±0.0029 | <0.228 | — | — |
