HD 4391

Last updated
HD 4391
Observation data
Epoch J2000       Equinox J2000
Constellation Phoenix
Right ascension 00h 45m 45.5930s [1]
Declination –47° 33 07.1438 [1]
Apparent magnitude  (V)5.80 [2]
Characteristics
Spectral type G3V [3]
B−V color index +0.64 [2]
Astrometry
Radial velocity (Rv)–11.4 [4]  km/s
Proper motion (μ)RA: 183.99 [1]   mas/yr
Dec.: 78.81 [1]   mas/yr
Parallax (π)65.97 ± 0.39 [1]   mas
Distance 49.4 ± 0.3  ly
(15.16 ± 0.09  pc)
Details
Mass 1.22 ± 0.04 [5]   M
Surface gravity (log g)4.85 [5]   cgs
Temperature 5,955 [5]   K
Metallicity [Fe/H]0.01 [5]   dex
Rotation 12 days [6]
Rotational velocity (v sin i)3.5 [3]  km/s
Age 1.2 [6]   Gyr
Other designations
CD-48 176, HD 4391, GJ 1021, HIP 3583, HR  209, SAO 215232. [7]
Database references
SIMBAD data

HD 4391 is a triple star system [8] in the constellation Phoenix that is located at a distance of 48.7 light years from the Sun. The primary has a stellar classification of G3V, which is a G-type main sequence star. The physical properties of this star are similar to the Sun, making it a solar analog. However, it is believed to have 22% greater mass than the Sun and is only 1.2 billion years old. [5] The spectrum for this star displays an abnormally low level of beryllium, which may be the result of some form of mixing process. [6]

No planet has been detected in orbit around this star, [5] nor does it emit a statistically significant excess of infrared radiation that might indicate a debris disk. [9] However, it has two companions that share a common proper motion through space with HD 4391, effectively making it a triple star system. The first, a red dwarf of type M4, lies at an angular separation of 17″ from the primary. The second is a type M5 star at a separation of 49″. [8]

Related Research Articles

HD 93083 is an orange-hued star in the southern constellation of Antlia. It has the proper name Macondo, after the mythical village of the novel One Hundred Years of Solitude. The name was selected by Colombia during the IAU's NameExoWorlds campaign. The star has an apparent visual magnitude of 8.30, which is too faint to be visible to the naked eye. It is located at a distance of 93 light years from the Sun based on parallax. HD 93083 is drifting further away with a radial velocity of +43.65 km/s, having come to within 43 light-years some 484,000 years ago.

HD 6434 is a star in the southern constellation of Phoenix. Yellow dwarfs such as this are not very luminous, so at a distance of 138 light years it is not visible to the unaided eye. However, with binoculars it is readily visible under ideal observing conditions, having an apparent visual magnitude of 7.71. The star is drifting further from the Sun with a radial velocity of +23 km/s.

HD 192263 is an 8th magnitude star about 64 light years away in the constellation of Aquila. The spectral type of the star is K2V, meaning that it is an orange dwarf, a type of star somewhat cooler and less luminous than the Sun. It is not visible to the unaided eye, but with good binoculars or small telescope it should be easy to spot.

HD 28185 is a yellow dwarf star similar to our Sun located about 128.6 light-years away from Earth in the constellation Eridanus. The designation HD 28185 refers to its entry in the Henry Draper catalogue. The star is known to possess one long-period extrasolar planet.

HD 172051 is a single, yellow-hued star in the southern constellation of Sagittarius. The star is barely bright enough to be seen with the naked eye, having an apparent visual magnitude of 5.85. Based upon an annual parallax shift of 76.64 mas, it is located some 43 light years from the Sun. It is moving away from the Sun with a radial velocity of +37 km/s.

HD 14412 is a single star in the southern constellation of Fornax. It has the Gould designation 22 G. Fornacis, while HD 14412 is the Henry Draper Catalogue designation. The star has an apparent visual magnitude of 6.33, which, according to the Bortle scale, can be dimly seen with the naked eye from rural locations. Based upon an annual parallax shift of 77.9″, this system is 42 light-years' distance from the Sun. It is drifting further away with a radial velocity of +7.5 km/s.

HD 192310 Star in the constellation Capricornus

HD 192310 is a star in the southern constellation of Capricornus. It is located in the solar neighborhood at a distance of almost 29 light years, and is within the range of luminosity needed to be viewed from the Earth with the unaided eye. HD 192310 is suspected of being a variable star, but this is unconfirmed.

Tau1 Gruis, Latinized from τ1 Gruis, and catalogued as HD 216435 and HR 8700, is a yellow-hued star approximately 106 light-years away in the constellation of Grus. The star is visible to the naked eye for some people, placing it in the Bright Star Catalogue. In 2002, one extrasolar planet was confirmed to orbit the star.

HD 8574 is a single star in the equatorial constellation of Pisces. It can be viewed with binoculars or a telescope, but not with the naked eye having a low apparent visual magnitude of +7.12. The distance to this object is 146 light years based on parallax, and it has an absolute magnitude of 3.88. The star is drifting further away from the Sun with a radial velocity of +18 km/s. It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.298 arc seconds per annum.

HD 196050 is a triple star system located in the southern constellation of Pavo. This system has an apparent magnitude of 7.50 and the absolute magnitude is 4.01. It is located at a distance of 112 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +61 km/s. It is also called by the Hipparcos number 101806.

HD 125072 is a star in the southern constellation of Centaurus. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.637. The star is located at a distance of 38.6 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −14.9 km/s. The components of the space velocity for this star are U=−18.5, V=−6.9 and W=−26.9 km/s.

HD 60532 is a white (F-type) main sequence star located approximately 84 light-years away in the constellation of Puppis, taking its primary name from its Henry Draper Catalogue designation. It is calculated to be 1.44 times more massive than the Sun. The star is only 59% as old as our Sun and has metallicity of only 38% that of our Sun. In 2008, two extrasolar planets were discovered in orbit around it.

HD 171238 is a 9th magnitude G-type main sequence star located approximately 146 light years away in the constellation Sagittarius. This star is a little bit cooler, less massive, older, and more metallic than the Sun. In August 2009, it was announced that this star has a planet.

HD 196761 is the Henry Draper Catalogue designation for a G-type main-sequence star in the constellation Capricornus. With an apparent magnitude of 6.37 it is near the limit of what can be seen with the naked eye, but according to the Bortle Scale it may be possible to view it at night from rural skies. Based upon parallax measurements by the Hipparcos spacecraft, it is located about 47 light years from the Solar System.

HD 44594 is a star in the southern constellation Puppis. It has an apparent visual magnitude of 6.64, so it can be seen with the naked eye from the southern hemisphere under good viewing conditions. Based upon parallax measurements, it is located at a distance of about 82 light-years from the Earth, giving it an absolute magnitude of 4.56.

HD 38858 is a G-type star, much like The Sun, with one detected planet. The planet, designated HD 38858 b, is about twice the mass of Uranus and orbits in the star's habitable zone.

39 Leonis is the Flamsteed designation for a star in the zodiac constellation of Leo. It has an apparent visual magnitude of 5.90, so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.04385″, which is equivalent to a distance of around 74.4 ly (22.8 pc) from the Sun.

HD 7199 is a star in the constellation Tucana located 118 light years distance from the Sun based on parallax. It has an orange hue but is too dim to be viewed with the naked eye, having an apparent visual magnitude of +8.06. The star is drifting further away from the Sun with a radial velocity of +5.6 km/s.

HD 126053 is the Henry Draper Catalogue designation for a star in the equatorial constellation of Virgo. It has an apparent magnitude of 6.25, which means it is faintly visible to the naked eye. According to the Bortle scale, it requires dark suburban or rural skies to view. Parallax measurements made by the Hipparcos spacecraft provide an estimated distance of 57 light years to this star.

HD 219623 is the Henry Draper Catalogue designation for a solitary star in the northern circumpolar constellation of Cassiopeia. It has an apparent visual magnitude of 5.59, which lies in the brightness range that is visible to the naked eye. According to the Bortle scale, it can be observed from dark suburban skies. Parallax measurements made by the Hipparcos spacecraft place it at an estimated distance of around 66.9 light years. It has a relatively high proper motion, advancing 262 milliarcseconds per year across the celestial sphere.

References

  1. 1 2 3 4 5 van Leeuwen, F. (November 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.
  2. 1 2 Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  3. 1 2 Torres, C. A. O.; et al. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695–708. arXiv: astro-ph/0609258 . Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602.
  4. Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Alan Henry Batten; John Frederick Heard (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: Academic Press, London. p. 57. Bibcode:1967IAUS...30...57E.
  5. 1 2 3 4 5 6 Santos, N. C.; et al. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics. 373: 1019–1031. arXiv: astro-ph/0105216 . Bibcode:2001A&A...373.1019S. doi:10.1051/0004-6361:20010648.
  6. 1 2 3 Santos, N. C.; et al. (October 2004). "Beryllium anomalies in solar-type field stars". Astronomy and Astrophysics. 425: 1013–1027. arXiv: astro-ph/0408109 . Bibcode:2004A&A...425.1013S. doi:10.1051/0004-6361:20040510.
  7. "HD 4391 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg . Retrieved 2010-07-13.
  8. 1 2 Raghavan, Deepak; et al. (September 2010). "A Survey of Stellar Families: Multiplicity of Solar-type Stars". The Astrophysical Journal Supplement. 190 (1): 1–42. arXiv: 1007.0414 . Bibcode:2010ApJS..190....1R. doi:10.1088/0067-0049/190/1/1.
  9. Beichman, C. A.; et al. (December 2006). "New Debris Disks around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal. 652 (2): 1674–1693. arXiv: astro-ph/0611682 . Bibcode:2006ApJ...652.1674B. doi:10.1086/508449.