94 Ceti

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

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.[12]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". 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. ^ Cite error: The named reference Wiegert2016 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Röll2011 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference mnras384_1_173 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Belle was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference apj771_1_40 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aaa411_3_559 was invoked but never defined (see the help page).
  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. S2CID 5233877.
  12. ^ Cite error: The named reference aa555_A11 was invoked but never defined (see the help page).