HD 68988

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HD 68988
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 08h 18m 22.174s[1]
Declination +61° 27′ 38.59″[1]
Apparent magnitude (V) 8.21
Characteristics
Spectral type G0V[2]
Astrometry
Proper motion (μ) RA: 129.01±0.52[1] mas/yr
Dec.: 31.26±0.62[1] mas/yr
Parallax (π)18.34 ± 0.78[1] mas
Distance178 ± 8 ly
(55 ± 2 pc)
Details
Mass1.16±0.01[3] M
Radius1.08±0.01[3] R
Luminosity1.297±0.002[3] L
Surface gravity (log g)4.42±0.01[3] cgs
Temperature5919±11[3] K
Age1.0±0.4[3] Gyr
Other designations
BD+61°1038, HIP 40687, SAO 14494
Database references
SIMBADdata

HD 68988 is an 8th magnitude G-type star located approximately 178 light-years away in Ursa Major constellation.

Planetary system[edit]

There are two planets: HD 68988 b was discovered in 2002[4] and HD 68988 c was discovered in 2006.[5]

The HD 68988 planetary system[5][6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >1.86 ± 0.16 MJ 0.0704 ± 0.0041 6.27711 ± 0.00021 0.1249 ± 0.0087
c >5–20 MJ 5–7 4000–22000 ?

See also[edit]

References[edit]

  1. ^ a b c d e 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. ^ van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085. arXiv:0901.1206Freely accessible. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. 
  3. ^ 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. 
  4. ^ Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal. 568 (1): 352–362. arXiv:astro-ph/0110378Freely accessible. Bibcode:2002ApJ...568..352V. doi:10.1086/338768. 
  5. ^ a b Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658Freely accessible. Bibcode:2007ApJ...657..533W. doi:10.1086/510553. 
  6. ^ 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 18m 22.1731s, +61° 27′ 38.599″