HD 80606 and HD 80607
09h 22m 37.5679s, +50° 36′ 13.397″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| HD 80606 | |
| Right ascension | 09h 22m 37.5769s[1] |
| Declination | +50° 36′ 13.430″[1] |
| Apparent magnitude (V) | +9.00[2] |
| HD 80607 | |
| Right ascension | 09h 22m 39.7369s[3] |
| Declination | +50° 36′ 13.945″[3] |
| Apparent magnitude (V) | +9.090[4] |
| Characteristics | |
| HD 80606 | |
| Spectral type | G5[5] |
| B−V color index | +0.765[5] |
| HD 80607 | |
| Spectral type | G5[5] |
| B−V color index | +0.828[5] |
| Details | |
| HD 80606 | |
Rotational velocity (v sin i) | 1.4 ± 0.4[6] km/s |
HIP 45983 | |
| Database references | |
| SIMBAD | HD 80606 |
| HD 80607 | |
HD 80606 and HD 80607 are two
Planetary system
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.[6][7] Its orbit is misaligned with the star's rotation at 53 degrees.[8][9] 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.[10][11][12]
At the time, its orbit was the most
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.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.0 ± 0.3[8] MJ | 0.453 ± 0.015[8] | 111.436 ± 0.003[8] | 0.9336 ± 0.0002[5] | 89.285 ± 0.023[5]° | 0.987 ± 0.061[9] RJ |
See also
References
- ^ .
- Bibcode:2000A&A...355L..27H.
- ^ .
- S2CID 119323941.
- ^ S2CID 2709427.
- ^ S2CID 14433784.
- ^ "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012.
- ^ S2CID 14625359.
- ^ S2CID 119251752.
- ^ "Astronomers Observe Planet With Wild Temperature Swings". NASA. 28 January 2009. Retrieved 11 February 2016.
- ^ "Spitzer Watches Wild Weather on a Star-Skimming Planet". NASA. 28 January 2009. Retrieved 11 February 2016.
- S2CID 35918197.
- S2CID 14345035.
Notes
External links
- "Distant planet's roasting orbit". BBC News. 2009-01-29. Retrieved 2009-01-29.
- HD 80606 and HD 80607 on
