HD 4391

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 mas[1]
Distance49.4 ± 0.3 ly
(15.16 ± 0.09 pc)
Details
Mass1.22 ± 0.04[5] M☉
Surface gravity (log g)4.85[5] cgs
Temperature5,955[5] K
Metallicity [Fe/H]0.01[5] dex
Rotation12 days[6]
Rotational velocity (v sin i)3.5[3] km/s
Age1.2[6] Gyr
Other designations
CD-48 176, HD 4391, GJ 1021, HIP 3583, HR 209, SAO 215232.[7]
Database references
SIMBADdata

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]

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  8. ^ a b Cite error: The named reference ApJS190_1_1 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference apj652_2_1674 was invoked but never defined (see the help page).