HD 4208

Last updated
HD 4208 / Cocibolca
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Sculptor
Right ascension 00h 44m 26.6507s [1]
Declination –26° 30′ 56.4582″ [1]
Apparent magnitude  (V)7.78 [2]
Characteristics
Spectral type G7V Fe-1 CH-0.5 [3]
B−V color index 0.664±0.004 [2]
Astrometry
Radial velocity (Rv)+56.77±0.09 [2]  km/s
Proper motion (μ)RA: 313.484±0.064 [1]   mas/yr
Dec.: 149.500±0.047 [1]   mas/yr
Parallax (π)29.2163 ± 0.0577  mas [1]
Distance 111.6 ± 0.2  ly
(34.23 ± 0.07  pc)
Absolute magnitude  (MV)5.23 [2]
Details [4]
Mass 0.883±0.024  M☉
Radius 0.846±0.028  R☉
Luminosity 0.71±0.004 [5]   L☉
Surface gravity (log g)4.501±0.036  cgs
Temperature 5,717±33  K
Metallicity [Fe/H]−0.28±0.02  dex
Rotational velocity (v sin i)4.4 [6]  km/s
Age 6.6±2.1 gyr [5]
3.813±2.970 [4]   Gyr
Other designations
Cocibolca, BD−27°223, GJ  9024, HD  4208, HIP  3479, SAO  166526, LTT  410 [7]
Database references
SIMBAD data
ARICNS data
Extrasolar Planets
Encyclopaedia 		data

HD 4208 is a star with an orbiting exoplanetary companion in the southern constellation of Sculptor. It has a yellow hue with an apparent visual magnitude of 7.78, [2] making it too dim to be visible to the naked eye. But with binoculars or small telescope it should be an easy target. This object is located at a distance of 111.6  light years from the Sun based on parallax, and is drifting further away with a radial velocity of +57 km/s. [2]

The star HD 4208 is named Cocibolca. The name was selected in the NameExoWorlds campaign by Nicaragua, during the 100th anniversary of the IAU. Cocibolca is the Nahuatl name for the Lake Nicaragua. [8] [9]

This is a G-type main-sequence star with a stellar classification of G7V Fe-1 CH-0.5, [3] where the suffix notation indicates underabundances of iron and carbyne in the spectrum. It is roughly 6.6 [5]  billion years old and is spinning with a projected rotational velocity of 4.4 km/s. [6] The star has 86% of the Sun's mass and radius, and is radiating 71% of the Sun's luminosity from its photosphere at an effective temperature of 5,717 K. [5]

In 2001, a planet was discovered orbiting the star by means of the radial velocity method. [10] This body is orbiting 1.66  AU from the host star with a period of 2.28 years and a low eccentricity of 0.042. [4] The position of this planet near the star's habitable zone means that it will have a strong gravitational perturbation effect on any potential Earth-mass planet that may be orbiting within this region. [11]

The HD 4208 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Xolotlan ≥ 0.810+0.014
−0.015  MJ 		1.662±0.015832.97+2.15
−1.89		0.042+0.039
−0.029		——

See also

Related Research Articles

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HD 81040 is a star in the equatorial constellation of Leo. With an apparent visual magnitude of +7.73 it is too dim to be visible to the naked eye but can be viewed with a small telescope. The star is located at a distance of 112 light years from the Sun based on parallax. It is drifting further away with a radial velocity of +49 km/s, having come to within 48 light-years some 527,000 years ago.

HD 231701 is a yellow-white hued star in the northern constellation of Sagitta, near the southern constellation border with Aquila. With an apparent visual magnitude of 8.97, it is too dim to be viewed with the naked eye, but can be seen with powerful binoculars or a small telescope. Parallax measurements provide a distance estimate of approximately 356 light years from the Sun, but it is drifting closer with a radial velocity of −63 km/s. It is predicted to come as close as 189.5 light-years in 1.345 million years.

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HD 118203 is a star located in the northern circumpolar constellation of Ursa Major. It has the proper name Liesma, which means flame, and it is the name of a character from the Latvian poem Staburags un Liesma. The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU.

HD 162020 is a star in the southern constellation of Scorpius with a likely red dwarf companion. It has an apparent visual magnitude of 9.10, which is too faint to be visible to the naked eye. The distance to this system is 102 light-years based on stellar parallax. It is drifting closer to the Sun with a radial velocity of −27 km/s, and is predicted to come to within ~18 light-years in 1.1 million years.

HD 45652 is a star with an exoplanetary companion in the equatorial constellation of Monoceros. It was officially named Lusitânia on 17 December 2019, after the IAU100 press conference in Paris by the IAU. This star has an apparent visual magnitude of 8.10, making it an 8th magnitude star that is too dim to be visible to the naked eye. The system is located at a distance of 114 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.188 arcsec yr−1.

HD 45364 is a star in the southern constellation of Canis Major. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.08. The distance to this system is 112 light years based on parallax. It is drifting further away from the Sun with a radial velocity of +16.4 km/s, having come within 49 light-years some 1.5 million years ago.

HD 85390 is a star with an exoplanet companion in the southern constellation of Vela. It was given the proper name Natasha by Zambia during the 100th anniversary of the IAU. Natasha means "thank you" in many languages of Zambia. This star is too faint to be seen with the naked eye, having an apparent visual magnitude of 8.54. It is located at a distance of 109 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 33 km/s.

HD 164604 is a single star in the southern constellation of Sagittarius constellation. It has the proper name Pincoya, as selected in the NameExoWorlds campaign by Chile, during the 100th anniversary of the IAU. Pincoya is a female water spirit from southern Chilean mythology who is said to bring drowned sailors to the Caleuche so that they can live in the afterlife. A 2015 survey ruled out the existence of any additional stellar companions at projected distances from 13 to 340 astronomical units. It is known to host a single super-Jupiter exoplanet.

HD 220689 is a single star in the equatorial constellation of Aquarius. It is a challenge to view with the naked eye, having an apparent visual magnitude of +7.74, but is readily viewed with a pair of binoculars. The star is located at a distance of 153 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s. A survey in 2015 has ruled out the existence of any additional stellar companions at projected distances from 26 to 305 astronomical units.

References

  1. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  3. 1 2 Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal . 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  4. 1 2 3 4 Barbato, D.; et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics. 615: 21. arXiv: 1804.08329 . Bibcode:2018A&A...615A.175B. doi:10.1051/0004-6361/201832791. S2CID   119099721. A175.
  5. 1 2 3 4 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv: 1411.4302 . Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID   54555839.
  6. 1 2 Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv: 1611.02897 , Bibcode:2017AJ....153...21L, doi: 10.3847/1538-3881/153/1/21 , S2CID   119511744, 21.
  7. ↑ "HD 4208". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-11-05.
  8. ↑ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. ↑ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  10. ↑ Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal. 568 (1): 352–362. arXiv: astro-ph/0110378 . Bibcode:2002ApJ...568..352V. doi:10.1086/338768. S2CID   2272917.
  11. ↑ Hinse, T. C.; et al. (September 2008). "Dynamics and stability of telluric planets within the habitable zone of extrasolar planetary systems. Numerical simulations of test particles within the HD 4208 and HD 70642 systems". Astronomy and Astrophysics. 488 (3): 1133–1147. Bibcode:2008A&A...488.1133H. doi: 10.1051/0004-6361:200809822 .
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