HR 3384

HR 3384
Observation data
Epoch J2000      Equinox J2000
Constellation Pyxis
Right ascension 08h 32m 51.49609s[1]
Declination –31° 30′ 03.0717″[1]
Apparent magnitude (V) 6.38[2]
Characteristics
Spectral type G9V[3]
U−B color index +0.29[4]
B−V color index +0.78[4]
Astrometry
Radial velocity (Rv)+81.91[5] km/s
Proper motion (μ) RA: –1113.37[1] mas/yr
Dec.: 761.57[1] mas/yr
Parallax (π)81.91 ± 0.46 mas[1]
Distance39.8 ± 0.2 ly
(12.21 ± 0.07 pc)
Absolute magnitude (MV)5.95[2]
Details
Mass0.750±0.015[6] M☉
Radius0.85[7] R☉
Luminosity0.44[8] L☉
Surface gravity (log g)4.56[9] cgs
Temperature5,290[9] K
Metallicity [Fe/H]−0.36[9] dex
Rotation40.2 ± 4.1 d[10]
Rotational velocity (v sin i)6.79[11] km/s
Age5.7–6.5[2] Gyr
Other designations
11 G. Pyxidis, CD−31° 6229, GJ 309, HD 72673, HIP 41926, HR 3384, SAO 199352, LHS 249, LTT 3168
Database references
SIMBADdata

HR 3384 (11 G. Pyxidis) is solitary star in the southern constellation of Pyxis. It has an apparent magnitude of 6.38,[2] indicating it is faintly visible to the naked eye. Based on the Bortle scale, the star can be viewed from dark rural skies. Astrometric measurements of the star by the Hipparcos spacecraft, give an estimated distance of about 40 light-years (12 parsecs) from Earth. It is moving away from the Sun with a radial velocity of +81.91.[5]

This star is lower in mass than the Sun at around 75%,[6] and has just 85%[7] of the Sun's radius. The spectrum matches a spectral class G9V,[3] indicating that this is a G-type main sequence star that is generating energy through the nuclear fusion of hydrogen at its core. The star is radiating 44%[8] of the Sun's luminosity from its photosphere at an effective temperature of 5,290 K.[9] It is about six[2] billion years old and is rotating slowly with a period of around 40 days. Surface magnetic activity has been detected with a periodic cycle of 3,050+558
−408 days.[10] HR 3384 has been examined for evidence of a circumstellar debris disk or planets, but, as of 2012, none have been discovered.[12]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference apj687 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference apjss141 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aa_555_A150 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b 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. Vizier catalog entry
  9. ^ a b c d Cite error: The named reference apj764_1_78 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference mnras371_4_1793 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa520_A79 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference aa541_A40 was invoked but never defined (see the help page).