94 Ceti

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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[1] mas
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
°
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
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
Extrasolar Planets
Encyclopaedia
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.

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.[11]

Stellar system[edit]

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[edit]

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.[12] It is most stable if its inclination is either 65 or 115, ± 3.[13]

The 94 Ceti planetary system[13]
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[edit]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  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. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". 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/0112477Freely accessible. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. 
  5. ^ a b 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:1607.03038Freely accessible. Bibcode:2016MNRAS.462.1735W. doi:10.1093/mnras/stw1682. 
  6. ^ Röll, Tristan Alexander (2011). Astrometric search for extrasolar planets in stellar multiple systems (PDF) (PhD). Friedrich-Schiller-University Jena. 
  7. ^ a b c d 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:0901.1206Freely accessible. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. 
  9. ^ a b 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:1306.2974Freely accessible, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, 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/0308429Freely accessible. Bibcode:2003A&A...411..559K. doi:10.1051/0004-6361:20031378. 
  11. ^ Eiroa, C.; et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics. 555: A11. arXiv:1305.0155Freely accessible. Bibcode:2013A&A...555A..11E. doi:10.1051/0004-6361/201321050. 
  12. ^ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef.com. 7 August 2000. Retrieved 2009-08-02. 
  13. ^ a b 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:1212.3843Freely accessible. Bibcode:2013AJ....146..108P. doi:10.1088/0004-6256/146/5/108. 

External links[edit]

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