HD 70642

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HD 70642
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 8h 21m 28.137s[1]
Declination –39° 42′ 19.48″[1]
Apparent magnitude (V) +7.18
Spectral type G5V
U−B color index 0.28
B−V color index 0.70
V−R color index 0.35
R−I color index 0.32
Variable type none
Radial velocity (Rv) +48.1 km/s
Proper motion (μ) RA: –201.65 ± 0.31[1] mas/yr
Dec.: 225.18 ± 0.42[1] mas/yr
Parallax (π) 35.63 ± 0.44[1] mas
Distance 92 ± 1 ly
(28.1 ± 0.3 pc)
Absolute magnitude (MV) +4.89
Mass 1.04±0.02[2] M
Radius 0.97±0.01[2] R
Luminosity 0.917±0.004[2] L
Surface gravity (log g) 4.47±0.02[2] cgs
Temperature 5732±23[2] K
Metallicity [Fe/H] 0.16±0.02 dex
Age 1.9±1.1[2] Gyr
Other designations
CD–39°4247, LTT 3116, HIP 40952, Gl 304, SAO 199126
Database references
Exoplanet Archive data
Extrasolar Planets

HD 70642 is a yellow dwarf star in the constellation of Puppis located 92 light years away.[1] This star has about the same mass and radius as the Sun, is slightly cooler and less luminous, and is richer in abundance of iron relative to hydrogen.

Planetary system[edit]

A long period planet companion to HD 70642 was announced in 2003. This planet orbits in a circular orbit (e=0.034) at 3.232 AU.[3] The star is so like Sol that its habitable zone is in the same place (~ 1 AU). The jovian ensures the stability of an Earth-mass planet at 1 AU.[4] This system is one of the most similar in conditions to the Solar System than any other currently known planetary systems.

The HD 70642 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥1.97 ± 0.18 MJ 3.23 ± 0.19 2068 ± 39 0.034 ± 0.043

See also[edit]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e f Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302Freely accessible. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. 
  3. ^ Carter, Brad D.; et al. (2003). "A Planet in a Circular Orbit with a 6 Year Period". The Astrophysical Journal Letters. 593 (1): L43–L46. arXiv:astro-ph/0307066Freely accessible. Bibcode:2003ApJ...593L..43C. doi:10.1086/378185. 
  4. ^ HINSE T.; MICHELSON R.; JOERGENSEN U.; GOZDIEWSKI K.; MIKKOLA S. (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 & Astrophysics. 488: 1133. Bibcode:2008A&A...488.1133H. doi:10.1051/0004-6361:200809822. 
  5. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493Freely accessible. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 

External links[edit]

Coordinates: Sky map 08h 21m 28.1361s, −39° 42′ 19.474″