HD 80606 and HD 80607

Binary star system in the constellation Ursa Major From Wikipedia, the free encyclopedia

HD 80606 and HD 80607

HD 80606 and HD 80607 are two stars comprising a binary star system. They are 215 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 Struve 1341 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.

Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Apparent magnitude (V) ...
HD 80606/7
Thumb
The HD 80606/7 binary star system on GALEX sky survey
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major[1]
HD 80606
Right ascension 09h 22m 37.5769s[2]
Declination +50° 36 13.430[2]
Apparent magnitude (V) +9.00[3]
HD 80607
Right ascension 09h 22m 39.7369s[4]
Declination +50° 36 13.945[4]
Apparent magnitude (V) +9.090[5]
Characteristics
HD 80606
Evolutionary stage main sequence[2]
Spectral type G8V[6]
B−V color index +0.765[7]
HD 80607
Evolutionary stage main sequence[4]
Spectral type G8V[8]
B−V color index +0.828[7]
Astrometry
HD 80606
Radial velocity (Rv)3.6[2] km/s
Proper motion (μ) RA: +56.022[2] mas/yr
Dec.: +10.331[2] mas/yr
Parallax (π)15.1439±0.0170 mas[2]
Distance215.4 ± 0.2 ly
(66.03 ± 0.07 pc)
Absolute magnitude (MV)+5.02[9]
HD 80607
Radial velocity (Rv)3.3[4] km/s
Proper motion (μ) RA: +52.656[4] mas/yr
Dec.: +9.938[4] mas/yr
Parallax (π)15.1482 ± 0.0157 mas[4]
Distance215.3 ± 0.2 ly
(66.01 ± 0.07 pc)
Absolute magnitude (MV)+5.11[9]
Details
HD 80606
Mass0.9[2] M
Radius1.1[2] R
Luminosity0.9[2] L
Surface gravity (log g)4.50±0.20[10] cgs
Temperature5,395[9] K
Metallicity [Fe/H]0.43±0.06[10] dex
Rotational velocity (v sin i)0.9±0.6[10] km/s
Age11.4[9] Gyr
HD 80607
Mass1.0[11] M
Radius1.0[4] R
Luminosity0.8[4] L
Surface gravity (log g)4.52±0.15[10] cgs
Temperature5,420[9] K
Metallicity [Fe/H]0.38±0.06[10] dex
Rotational velocity (v sin i)1.4±0.4[10] km/s
Age8.1[9] Gyr
Other designations
BD+51°1500, CCDM J09226+5036, WDS J09226+5036, STF 1341
HD 80606: HIP 45982, SAO 27230
HD 80607: HIP 45983
Database references
SIMBADHD 80606
HD 80607
Close

Stellar system

The binary system components are very similar G-type main sequence stars with similar properties to the Sun, although both are older than the Sun and approaching the very end of their main sequence lives.[4][2]

Planetary system

Summarize
Perspective
Thumb
The orbital motion of HD 80606 b

The variable radial velocity of HD 80606 was first noticed in 1999 from observations with the 10-m Keck 1 telescope at the W. M. Keck Observatory in Hawaii by the G-Dwarf Planet Search, a survey of nearly 1,000 nearby G dwarfs to identify extrasolar planet candidates. The star was then followed up by the Geneva Extrasolar Planet Search team using the ELODIE spectrograph mounted on the 1.93-m telescope at the Haute-Provence Observatory. The discovery of HD 80606 b was announced on April 4, 2001.[10][12] Its orbit is misaligned with the star's rotation at 53 degrees.[13][14] 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.[15][16][17] At the time, its orbit was the most eccentric orbit of any extrasolar planet known.[note 1] It has an eccentricity of 0.9336,[7] 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.[13]

In a simulation of a ten-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.[18]

More information Companion (in order from star), Mass ...
The HD 80606 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 4.0±0.3[13] MJ 0.453±0.015[13] 111.436±0.003[13] 0.9336±0.0002[7] 89.285±0.023[7]° 0.987±0.061[14] RJ
Close

See also

References

Notes

Loading related searches...

Wikiwand - on

Seamless Wikipedia browsing. On steroids.