HD 38858

HD 38858
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 05h 48m 34.93996s[1]
Declination −04° 05′ 40.7153″[1]
Apparent magnitude (V) +5.97[2]
Characteristics
Spectral type G4V[3]
U−B color index +0.10[2]
B−V color index +0.64[2]
Astrometry
Radial velocity (Rv)+31.2[4] km/s
Proper motion (μ) RA: 60.84 ± 0.41[1] mas/yr
Dec.: –228.35 ± 0.33[1] mas/yr
Parallax (π)65.89 ± 0.41[1] mas
Distance49.5 ± 0.3 ly
(15.18 ± 0.09 pc)
Details
Mass0.886[5] M☉
Radius0.9331 ± 0.0162[5] R☉
Luminosity0.7943 ± 0.0101[5] L☉
Surface gravity (log g)4.36 ± 0.06[3] cgs
Temperature5,660 ± 20[3] K
Metallicity [Fe/H]–0.27 ± 0.03[3] dex
Rotational velocity (v sin i)2.61[6] km/s
Age6.2[7] Gyr
Other designations
BD–04 1244, FK5 1155, GJ 1085, HD 38858, HIP 27435, LTT 2380, SAO 132554.
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 38858 is a G-type star[3] 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.[8]

The last observation of this system for a dust disc or comet belt was in 2009 by the Spitzer Space Telescope; a belt was inferred at 102 AU.[7] It has an inclination of 48◦.[9]

The HD 38858 planetary system[10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 32[11] M⊕ 1.0376 ± 0.0189 407.15 ± 4.2857 0.27 ± 0.17 — —
Disk 102–102 AU — —

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. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 4 5 J. Maldonado, C. Eiroa, E. Villaver, B. Montesinos and A. Mora (2012). "Metallicity of solar-type stars with debris discs and planets". Astronomy & Astrophysics. 541: A40. Bibcode:2012A&A...541A..40M. arXiv:1202.5884 Freely accessible. doi:10.1051/0004-6361/201218800.
  4. ↑ Nordström, B.; et al. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs". Astronomy and Astrophysics. 418 (3): 989–1019. Bibcode:2004A&A...418..989N. arXiv:astro-ph/0405198 Freely accessible. doi:10.1051/0004-6361:20035959.
  5. 1 2 3 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): 40, Bibcode:2013ApJ...771...40B, arXiv:1306.2974 Freely accessible, doi:10.1088/0004-637X/771/1/40.
  6. ↑ Martínez-Arnáiz, R.; et al. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter". Astronomy and Astrophysics. 520: A79. Bibcode:2010A&A...520A..79M. arXiv:1002.4391 Freely accessible. doi:10.1051/0004-6361/200913725.
  7. 1 2 Wyatt, M. C.; et al. (2012). "Herschel imaging of 61 Vir: implications for the prevalence of debris in low-mass planetary systems". Monthly Notices of the Royal Astronomical Society. 424 (2): 1206. Bibcode:2012MNRAS.tmp.3237W. arXiv:1206.2370 Freely accessible. doi:10.1111/j.1365-2966.2012.21298.x. citing Lawler et al. 2009, and recalculating its distance.
  8. ↑ LTT 2380 -- High proper-motion Star, SIMBAD Astronomical Database, accessed 11 October 2012.
  9. ↑ Bryden et al., promised in John E. Krist; Karl R. Stapelfeldt; Geoffrey Bryden; Peter Plavchan (2012), "Hubble Space Telescope Observations of the HD 202628 Debris Disk", Astronomical Journal, 144 (2): 45, Bibcode:2012AJ....144...45K, arXiv:1206.2078 Freely accessible, doi:10.1088/0004-6256/144/2/45
  10. ↑ "hd_38858_b".
  11. ↑ Wyatt; m sin i is 0.0961 ± 0.012 MJ / 30.55 ± 4.11 (which Wyatt knew from most current cited paper Mayor, "HARPS XXXIV", 2011). Wyatt has likely factored in the inclination but did not state this outright in the arXiv version of the paper.


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