HD 11964
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 7.51[2] |
| Characteristics | |
| Spectral type | G9VCN+1[3][2] + M0.0Ve[4] |
| Apparent magnitude (U) | 7.705Script error: No such module "Unsubst". |
| Apparent magnitude (B) | 8.117[2] |
| Apparent magnitude (R) | 5.960Script error: No such module "Unsubst". |
| Apparent magnitude (I) | 6.914[2] |
| Apparent magnitude (J) | Script error: No such module "val".[2] |
| Apparent magnitude (H) | Script error: No such module "val".[2] |
| Apparent magnitude (K) | Script error: No such module "val".[2] |
| U−B Template:Engvar | 0.450 |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| V−R Template:Engvar | 0.455 |
| R−I Template:Engvar | 0.405 |
| Variable type | SuspectedScript error: No such module "Unsubst". |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 29.7890±0.0378 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.84[2] |
| Details | |
| A | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | 2.9[6] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[5] cgs |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | Script error: No such module "val".[5] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[5] km/s |
| Age | Script error: No such module "val".[6] Gyr |
| B | |
| Radius | Script error: No such module "val".[1] Template:Solar radius |
| Luminosity | 0.085[1] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[1] K |
| Metallicity [Fe/H] | Script error: No such module "val".[8] dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
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HD 11964 is a binary star system located 110[1] light-years away from the Sun in the equatorial constellation of Cetus. It is visible in binoculars or a telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 7.51.[2] The system is drifting closer to the Sun with a radial velocity of −9 km/s.[5] Two extrasolar planets have been confirmed to orbit the primary.
Properties
The primary, component A, is a G-type main-sequence star with a stellar classification of G9VCN+1.[3] The suffix notation indicates an overabundance of the cyano radical in the spectrum. Houk and Swift (1999) found a class of G8IV, suggesting it is instead a more evolved subgiant star.[10] It is around seven[6] billion years old and is spinning slowly with a projected rotational velocity of 1.5 km/s.[5] The star has 1.1[6] times the mass of the Sun and 2.2[7] times the Sun's radius. It is radiating 2.9[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,321 K.[5]
A wide binary companion star was discovered in 2000.[11] This secondary, designated component B, has a visual magnitude of 11.11 and lies at an angular separation of Script error: No such module "val". along a position angle of 134°, as of 2015.[12] It is a red dwarf with a class of M0V,[4] and has just 0.6 times the Sun's radius. It is radiating 0.085 times the Sun's luminosity at an effective temperature of 4,033 K.[1]
Planetary system
In August 2005, two planets were discovered orbiting the star, the innermost like Neptune and another like Jupiter orbiting at 3.34 AU. However, the second planet (HD 11964 b) was not confirmed until May 2007. In September 2007, P.C. Gregory claimed that there was a third planet in the system on the basis of Bayesian analysis of the radial velocity data. The planet was claimed to have a mass similar to that of Saturn and located in a 360-day orbit. Gregory cautioned that the close match between the period of this planet to being exactly a year meant that the radial velocity variations may have been caused by insufficient correction for the motion of the Earth in orbit around the Sun.[13] The planet was not detected in re-reduced data in an analysis published in the Astrophysical Journal in 2009.[14]
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See also
References
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External links
- Extrasolar Planet Interactions Template:Webarchive by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona