HD 80606 and HD 80607

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HD 80606/7
HD 80606 HD 80607 GALEX WikiSky.jpg
The HD 80606/7 binary star system on GALEX sky survey
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
HD 80606
Right ascension 09h 22m 37.5679s
Declination +50° 36′ 13.397″
Apparent magnitude (V) +8.93
HD 80607
Right ascension 09h 22m 39.7266s
Declination +50° 36′ 13.927″
Apparent magnitude (V) +9.07
Spectral type G5V / G5V
Radial velocity (Rv) 3.6 / 3.3 km/s
Proper motion (μ) RA: 42.80 / 46.98 mas/yr
Dec.: 8.26 / 6.92 mas/yr
Parallax (π) 9.51 / 17.13 mas
Distance 190.41 ly
(58.38 pc)
HD 80606
Mass 0.9 M
Temperature 5370 K
Metallicity 0.43
Age 7.63 ×109 years
Other designations
BD+51°1500, BDS 5037, CCDM J09226+5036, Σ 1341, WDS J09227+5036
HD 80606

HIP 45982, BD+51°1500B, BDS 5037 B, CCDM J09226+5036B, Σ1341B, WDS J09227+5036B

HD 80607
HIP 45983, BD+51°1500A, BDS 5037 A, CCDM J09226+5036A, Σ1341A, WDS J09227+5036A
Database references
Database references
Extrasolar Planets

HD 80606 and HD 80607 are two stars comprising a binary star system approximately 190 light-years away in the constellation of Ursa Major. Both stars orbit each other at an average distance of 1,200 astronomical units. The binary system is listed as Σ1341 in the Struve Catalogue of Double Stars, however this designation is not in wide use and the system is usually referred to by the HD designations of its constituent stars. An extrasolar planet has been confirmed to orbit HD 80606 in a highly elliptical orbit.

Planetary system[edit]

The orbital motion of HD 80606 b.

Naef's team in 2001 discovered HD 80606 b.[1][2] Its orbit is misaligned with the star's rotation at 53 degrees.[3][4] Additional studies using the Spitzer Space Telescope in the infrared, and the Very Large Array in the millimeter radio, have shown that the highly eccentric planet 'b' orbiting HD 80606 grazes the parent star at its closest passage to produce difficult-to-detect stellar lobing, severe 'space weather', aurorae and other non-thermal activity.[5][6][7]

At the time, its orbit was the most eccentric orbit of any extrasolar planet known.[8] It has an eccentricity of 0.9336,[9] comparable to that of Comet Halley in the Solar System. The eccentricity may be a result of the Kozai mechanism, which would occur if the planet's orbit is significantly inclined to that of the binary stars. This conclusion is reinforced by the detection of the misalignment, an expected result of the Kozai mechanism.[3]

In a simulation of a 10 million year span, the planet "sweeps clean" most test particles within 1.75 AU of HD 80606. The 8:1 resonance hollows out another Kirkwood gap at 1.9 AU. There cannot be any habitable planets in this system. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less.[10]

The HD 80606 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 4.0 ± 0.3[3] MJ 0.453 ± 0.015[3] 111.436 ± 0.003[3] 0.9336 ± 0.0002[9] 89.285 ± 0.023[9]° 0.987 ± 0.061[4] RJ

See also[edit]


  1. ^ "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012. 
  2. ^ Naef, D.; et al. (2001). "HD 80606 b, a planet on an extremely elongated orbit". Astronomy and Astrophysics Letters. 375 (2): L27–L30. arXiv:astro-ph/0106256Freely accessible. Bibcode:2001A&A...375L..27N. doi:10.1051/0004-6361:20010853. 
  3. ^ a b c d e Moutou, C.; et al. (2009). "Photometric and spectroscopic detection of the primary transit of the 111-day-period planet HD 80606 b". Astronomy and Astrophysics Letters. 498 (1): L5–L8. arXiv:0902.4457Freely accessible. Bibcode:2009A&A...498L...5M. doi:10.1051/0004-6361/200911954. 
  4. ^ a b Roberts, Jessica E.; et al. (2013). "MOST Space Telescope Photometry of the 2010 January Transit of Extrasolar Planet HD80606b". The Astrophysical Journal. 762 (21). 55. arXiv:1212.0285Freely accessible. Bibcode:2013ApJ...762...55R. doi:10.1088/0004-637X/762/1/55. 
  5. ^ http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20090128_prt.htm
  6. ^ http://www.nasa.gov/centers/goddard/news/topstory/2009/spitzer_wild.html
  7. ^ Lazio, T.J.W., Shankland, P.D., Farrell, W.M., & Blank, D.L., 2010, Astronomical Journal, 140, 1929. http://adsabs.harvard.edu/abs/2010AJ....140.1929L
  8. ^ Since then, HD 20782 b has been found, at 0.97.
  9. ^ a b c Fossey, S. J.; et al. (2009). "Detection of a transit by the planetary companion of HD 80606". Monthly Notices of the Royal Astronomical Society: Letters. 396 (1): L16–L20. arXiv:0902.4616Freely accessible. Bibcode:2009MNRAS.396L..16F. doi:10.1111/j.1745-3933.2009.00653.x. 
  10. ^ 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:0706.1962Freely accessible. Bibcode:2007AJ....134.1276W. doi:10.1086/520880. 

External links[edit]

Coordinates: Sky map 09h 22m 37.5679s, +50° 36′ 13.397″