HD 89744

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HD 89744
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 10h 22m 10.563s[1]
Declination +41° 13′ 46.31″[1]
Apparent magnitude (V) 5.74
Evolutionary stage F7IV
Radial velocity (Rv)+14 km/s
Proper motion (μ) RA: −119.41±0.31[1] mas/yr
Dec.: −138.31±0.22[1] mas/yr
Parallax (π)25.36 ± 0.31[1] mas
Distance129 ± 2 ly
(39.4 ± 0.5 pc)
Absolute magnitude (MV)2.83[2]
Other designations
BD+41°2076, GCRV 6516, GJ 9326, HIP 50786, HR 4067, NLTT 24128, SAO 43309
Database references
SIMBADThe star
planet b
Exoplanet Archivedata
Extrasolar Planets

HD 89744 is an F-type subgiant star about 130 light years away in the constellation of Ursa Major. This star has 1.45 times the mass of the Sun, with a projected rotational velocity of 8.0 km s−1.[2] In 2004, stellar companion HD 89744 B (~0.076 solar mass) with a projected separation of 2,456 AU was detected.[3]

Planetary system[edit]

In April 2000, a planet was discovered using radial velocity measurements taken at Fred Lawrence Whipple Observatory and Lick Observatory.[4] The orbital parameters were updated in 2006 and 2009 using additional measurements.[5][6]

The HD 89744 planetary system[6]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >7.92±0.23 MJ 0.91±0.01 256.78±0.05 0.689±0.006

See also[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:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P
  3. ^ Mugrauer, M.; et al. (2005). "Four new wide binaries among exoplanet host stars". Astronomy and Astrophysics. 440 (3): 1051–1060. arXiv:astro-ph/0507101. Bibcode:2005A&A...440.1051M. doi:10.1051/0004-6361:20042297.
  4. ^ Korzennik, Sylvain G.; et al. (2000). "A High-Eccentricity Low-Mass Companion to HD 89744". The Astrophysical Journal Letters. 533 (2): L147–L150. arXiv:astro-ph/0003045. Bibcode:2000ApJ...533L.147K. doi:10.1086/312611.
  5. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
  6. ^ a b Wittenmyer, Robert A.; et al. (2007). "Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems". The Astronomical Journal. 134 (3): 1276–1284. arXiv:0706.1962. Bibcode:2007AJ....134.1276W. doi:10.1086/520880.

Coordinates: Sky map 10h 11m 10.5621s, +41° 13′ 46.308″