03h12m46.4365s, −01° 11′ 45.964″
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 03h12m 46.43719s[1] |
| Declination | −01° 11′ 45.9613″[1] |
| Apparent magnitude (V) | +5.070[2] |
| Characteristics | |
| Spectral type | F8V / M3V / M |
| U−B color index | +0.09[3] |
| B−V color index | +0.56[3] |
| Astrometry | |
| Radial velocity (Rv) | +18.96 ± 0.08[4] km/s |
| Proper motion (μ) | RA: 194.56[1] mas/yr Dec.: −69.01[1] mas/yr |
| Parallax (π) | 44.29 ± 0.28 mas[1] |
| Distance | 73.6 ± 0.5 ly (22.6 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.32 |
| Orbit[5] | |
| Primary | 94 Ceti A |
| Companion | 94 Ceti BC |
| Period (P) | 2029±41 yr |
| Semi-major axis (a) | 220±5 AU |
| Eccentricity (e) | 0.26±0.01 |
| Inclination (i) | 104±2° |
| Longitude of the node (Ω) | 97±2° |
| Argument of periastron (ω) (secondary) | 342±7° |
| Orbit[6] | |
| Primary | 94 Ceti B |
| Companion | 94 Ceti C |
| Period (P) | 378.35+0.36 −0.34 d |
| Semi-major axis (a) | 0.984±0.007 AU |
| Eccentricity (e) | 0.360±0.005 |
| Inclination (i) | 108.323+0.581 −0.561° |
| Longitude of the node (Ω) | 191.496+1.602 −1.562° |
| Periastron epoch (T) | MJD 55113.904±0.220 |
| Argument of periastron (ω) (secondary) | 334.895±0.240° |
| Details | |
| Mass | 1.30[7] M☉ |
| Radius | 1.898 ± 0.070[8] R☉ |
| Luminosity | 4.02 ± 0.05[9] L☉ |
| Surface gravity (log g) | 3.98 ± 0.10[7] cgs |
| Temperature | 6,055 ± 10.0[10] K |
| Metallicity [Fe/H] | 1.15 ± 0.07[7] dex |
| Rotation | 12.2 d[11] |
| Rotational velocity (v sin i) | 8.4 ± 0.8[7] km/s |
| Age | 4.8[9] Gyr |
| Other designations | |
BD-01° 457, FK5 116, GJ 128, HD 19994, HIP 14954, HR 962, LTT 1515, SAO 130355. | |
| Database references | |
| SIMBAD | data |
94 Ceti (HD 19994) is a trinary star system approximately 73 light-years away in the constellation Cetus.
94 Ceti A is a yellow-white dwarf star with about 1.3 times the mass of the Sun while 94 Ceti B and C are red dwarf stars.
Aninfrared excess has been detected around the primary, most likely indicating the presence of a circumstellar disk at a radius of 95 AU. The temperature of this dust is 40 K.[12]
This system is a hierarchical triple star system with 94 Ceti A being orbited by 94 Ceti BC, a pair of M dwarfs, in 2000 years. 94 Ceti B and C meanwhile orbit each other in a 1-year orbit.[5]
On 7 August 2000, a planet was announced by the Geneva Extrasolar Planet Search team as a result of radial velocity measurements taken with the Swiss 1.2-metre Leonhard Euler TelescopeatLa Silla ObservatoryinChile.[13] It is most stable if its inclination is either 65 or 115, ± 3.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.855 ± 0.045 MJ | 1.427 | 535.7 ± 3.1 | 0.30 ± 0.04 | — | — |
