94 Ceti

94 Ceti A / B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 03h 12m 46.44s[1]
Declination −01° 11′ 46.0″[1]
Apparent magnitude (V) +5.07
Characteristics
Spectral type F8V / M3V
U−B color index 0.11 / ?
B−V color index 0.56 / ?
Variable type None
Astrometry
Radial velocity (Rv)+18.3 km/s
Proper motion (μ) RA: 194.56 ± 0.37[1] mas/yr
Dec.: -69.01 ± 0.30[1] mas/yr
Parallax (π)44.29 ± 0.28[1] mas
Distance73.6 ± 0.5 ly
(22.6 ± 0.1 pc)
Absolute magnitude (MV)3.32
Orbit
Companion94 Ceti B
Period (P)1,470 yr
Semi-major axis (a)151 AU"
Eccentricity (e)0.26
Inclination (i)114.10°
Details
Mass1.30[2] M☉
Radius1.898 ± 0.070[3] R☉
Luminosity4.02 ± 0.05[4] L☉
Surface gravity (log g)3.98 ± 0.10[2] cgs
Temperature6,055 ± 10.0[5] K
Metallicity [Fe/H]1.15 ± 0.07[2] dex
Rotational velocity (v sin i)8.4 ± 0.8[2] km/s
Age4.8[4] Gyr
Other designations
BD -01°457, FK5 116, GJ 128, HD 19994, HIP 14954, HR 962, LTT 1515, SAO 130355.
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

94 Ceti (HD 19994) is a binary 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 is a red dwarf star. According to the new Sixth Catalog of Orbits of Visual Binaries, stars A and B have an average separation of 151 AU.

An infrared 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.[6]

Planetary system

On 7 August 2000, a planet was discovered.[7] It is most stable if its inclination is either 65 or 115, ± 3.[8]

The 94 Ceti planetary system[8]
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 — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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
  2. ↑ 2.0 2.1 2.2 2.3 Fuhrmann, K. (2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.
  3. ↑ van Belle, G. T.; von Brau, K. (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085.
  4. ↑ 4.0 4.1 Boyajian, Tabetha S. et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, 40. See Table 3.
  5. ↑ Kovtyukh, V. V.; Soubiran, C.; Belik, S. I.; Gorlova, N. I. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios". Astronomy and Astrophysics 411 (3): 559–564. arXiv:astro-ph/0308429. Bibcode:2003A&A...411..559K. doi:10.1051/0004-6361:20031378.
  6. ↑ Eiroa, C. et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics 555: A11. arXiv:1305.0155. Bibcode:2013A&A...555A..11E. doi:10.1051/0004-6361/201321050.
  7. ↑ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef.com. 7 August 2000. Retrieved 2009-08-02.
  8. ↑ 8.0 8.1 Plávalová, E.; Solovaya, N. A. (2012). "Analysis of the motion of an extrasolar planet in a binary system". arXiv:1212.3843 [astro-ph.EP].

External links

Coordinates: 03h 12m 46.4365s, −01° 11′ 45.964″