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94 Ceti (HD 19994) is a trinary star system approximately 73 light-years away in the constellation Cetus.

94 Ceti A / B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 03h 12m 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]
Distance73.6 ± 0.5 ly
(22.6 ± 0.1 pc)
Absolute magnitude (MV)3.32
Orbit[5]
Primary94 Ceti A
Companion94 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]
Primary94 Ceti B
Companion94 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
Mass1.30[7] M☉
Radius1.898 ± 0.070[8] R☉
Luminosity4.02 ± 0.05[9] L☉
Surface gravity (log g)3.98 ± 0.10[7] cgs
Temperature6,055 ± 10.0[10] K
Metallicity [Fe/H]1.15 ± 0.07[7] dex
Rotation12.2 d[11]
Rotational velocity (v sin i)8.4 ± 0.8[7] km/s
Age4.8[9] 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 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.

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.[12]


Stellar system


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]


Planetary system


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 Telescope at La Silla Observatory in Chile.[13] It is most stable if its inclination is either 65 or 115, ± 3.[14]

The 94 Ceti planetary system[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 — —

See also



References


  1. 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. S2CID 18759600. Vizier catalog entry
  2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  4. Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
  5. Wiegert, J.; et al. (2016). "94 Ceti: A triple star with a planet and dust disc". Monthly Notices of the Royal Astronomical Society. 462 (2): 1735–1748. arXiv:1607.03038. Bibcode:2016MNRAS.462.1735W. doi:10.1093/mnras/stw1682. S2CID 55234970.
  6. Röll, Tristan Alexander (2011). Astrometric search for extrasolar planets in stellar multiple systems (PhD). Friedrich-Schiller-University Jena.
  7. 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.
  8. 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. S2CID 18370219.
  9. 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, S2CID 14911430, 40. See Table 3.
  10. 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. S2CID 18478960.
  11. Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250.
  12. 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. S2CID 377244.
  13. "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef.com. 7 August 2000. Retrieved 2 August 2009.
  14. Plávalová, Eva; Solovaya, Nina A. (2013). "Analysis of the motion of an extrasolar planet in a binary system". The Astronomical Journal. 146 (5): 108. arXiv:1212.3843. Bibcode:2013AJ....146..108P. doi:10.1088/0004-6256/146/5/108. S2CID 118629538.



На других языках

[de] 94 Ceti

94 Ceti (auch als HD 19994 katalogisiert) ist ein etwa 73 Lichtjahre entfernter Doppelstern, bestehend aus einem gelben Zwerg der Spektralklasse F8 und einem roten Zwerg der Spektralklasse M3. Der gelbe Zwerg besitzt eine scheinbare Helligkeit von 5,1 mag, der rote Zwerg von 11,5 mag.
- [en] 94 Ceti

[es] 94 Ceti

94 Ceti (94 Cet)[1] es una estrella trinaria situada en la constelación de Cetus. Situada a una distancia de 73 años luz del Sistema Solar, brilla con magnitud aparente +5,06.

[ru] 94 Кита

94 Кита (лат. 94 Ceti) — двойная звезда, которая находится в созвездии Кита на расстоянии около 73 св. лет от нас. Вокруг звезды обращается, как минимум, одна (неподтверждённая) планета.


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