Astronomy:94 Ceti

From HandWiki
Short description: Trinary star system in the constellation Cetus
94 Ceti A / B
Observation data
Equinox J2000.0]] (ICRS)
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
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 (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]

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. ↑ 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. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL.  Vizier catalog entry
  2. ↑ Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 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. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series 141 (2): 503–522. doi:10.1086/340570. Bibcode: 2002ApJS..141..503N. 
  5. ↑ 5.0 5.1 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. doi:10.1093/mnras/stw1682. Bibcode: 2016MNRAS.462.1735W. 
  6. ↑ Röll, Tristan Alexander (2011). Astrometric search for extrasolar planets in stellar multiple systems (PhD). Friedrich-Schiller-University Jena.
  7. ↑ 7.0 7.1 7.2 7.3 Fuhrmann, K. (2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society 384 (1): 173–224. doi:10.1111/j.1365-2966.2007.12671.x. Bibcode: 2008MNRAS.384..173F. 
  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. doi:10.1088/0004-637X/694/2/1085. Bibcode: 2009ApJ...694.1085V. 
  9. ↑ 9.0 9.1 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, doi:10.1088/0004-637X/771/1/40, 40, Bibcode: 2013ApJ...771...40B.  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. doi:10.1051/0004-6361:20031378. Bibcode: 2003A&A...411..559K. http://www.aanda.org/articles/aa/full/2003/46/aa3944/aa3944.html. 
  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. doi:10.1051/0004-6361:20034250. Bibcode: 2004A&A...415..391M. http://www.aanda.org/articles/aa/full/2004/07/aa0250/aa0250.html. 
  12. ↑ Eiroa, C. et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics 555: A11. doi:10.1051/0004-6361/201321050. Bibcode: 2013A&A...555A..11E. 
  13. ↑ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef.com. 7 August 2000. http://www.spaceref.com/news/viewpr.html?pid=2365. 
  14. ↑ 14.0 14.1 Plávalová, Eva; Solovaya, Nina A. (2013). "Analysis of the motion of an extrasolar planet in a binary system". The Astronomical Journal 146 (5): 108. doi:10.1088/0004-6256/146/5/108. Bibcode: 2013AJ....146..108P. 

External links

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



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:94_Ceti&oldid=3425349"