A0 (begin/observe/end) edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
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A1 (begin/observe/end, extra whitespace after) edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
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A (default epoch and equinox) edit
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54
|
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A edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54
|
abc def
B edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Other designations | |
xx | |
ghi jkl
C edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Other designations | |
xx | |
| Database references | |
| SIMBAD | data |
mno pqr
D edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Database references | |
| SIMBAD | data |
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C2 edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Other designations | |
xx | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
mno pqr
D2 edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HD 82943 is a yellow dwarf star approximately 89 light-years away in the constellation of Hydra. As of 2001, two extrasolar planets have been confirmed to be orbiting around the star.[1] [2] Because of the some stellar characteristics, it is thought that the system had more giant planets that were "swallowed" by the parent star.[3]
A edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Absolute magnitude (V) | 12 |
| Distance | 100 ly (30 pc) |
abc def
B edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Absolute magnitude (V) | 12 |
| Distance | 100 ly (30 pc) |
| Other designations | |
xx | |
ghi jkl
C edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Absolute magnitude (V) | 12 |
| Distance | 100 ly (30 pc) |
| Other designations | |
xx | |
| Database references | |
| SIMBAD | data |
mno pqr
D edit
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07′ 46.365″ |
| Apparent magnitude (V) | 6.54 |
| Absolute magnitude (V) | 12 |
| Distance | 100 ly (30 pc) |
| Database references | |
| SIMBAD | data |
HD 82943 is a yellow dwarf star approximately 89 light-years away in the constellation of Hydra. As of 2001, two extrasolar planets have been confirmed to be orbiting around the star.[4]
[5] Because of the some stellar characteristics, it is thought that the system had more giant planets that were "swallowed" by the parent star.[3]
Planetary system edit
The first planet discovered (designated HD 82943 b) was announced in 2000 by a team of French astronomers lead by Michel Mayor. The planet orbits its parent star at a mean distance of 1.19 astronomical units (AU) and taking approximately 441 days to complete the orbit. Nearly a year later, a second planet (designated HD 82943 c) was announced by the same discoverers of the previous planet. The planet orbits parent star in a closer orbit than the previously discovered planet (not to be confused with its designation) at a mean distance of 0.746 AU and taking 219 days to complete its orbit.[6] Both planets are more massive than Jupiter, but are not massive enough to have been quoted as "Super-Jupiters."
Announced in 2001, HD 82943 was found to contain an unusually high amount of Lithium-6. Stars do not naturally contain Lithium-6, but unlike stars, planets never reach temperatures that are high enough to burn their initial content of Lithium-6 (planets should retain Lithium-6).[3] The simplest and most convincing answer to explain this observation is that one or more planets, or at least planetary material, have fallen into the star, sometime after it passed through its early evolutionary stage.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | 2.01 MJ | 0.746 | 219 | 0.359 | — | — |
| b | 1.75 MJ | 1.19 | 441.2 | 0.219 | — | — |
See also edit
References edit
- ^ Mayor; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE" (abstract). Astronomy and Astrophysics. 415: 391–402. doi:10.1051/0004-6361:20034250.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ Butler, R.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646: 505–522. doi:10.1086/504701.
{{cite journal}}: Explicit use of et al. in:|author=(help) (web Preprint) - ^ a b c "The Harsh Destiny of a Planet?". European Southern Observatory . 2001-05-09. Retrieved 2008-07-15.
- ^ Mayor; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE" (abstract). Astronomy and Astrophysics. 415: 391–402. doi:10.1051/0004-6361:20034250.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ Butler, R.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646: 505–522. doi:10.1086/504701.
{{cite journal}}: Explicit use of et al. in:|author=(help) (web Preprint) - ^ Lee; et al. (2006). "On the 2:1 Orbital Resonance in the HD 82943 Planetary System". The Astrophysical Journal. 641: 1178–1187. doi:10.1086/500566.
{{cite journal}}: Explicit use of et al. in:|author=(help) (web Preprint)
External links edit
- "HD 82943". Extrasolar Visions. Retrieved 2008-07-15.
- "HD 82943: Planet Swallower". Astronomy Picture of the Day. NASA. 2001-05-18. Retrieved 2008-07-15.
- "Notes for star HD 82943". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-15.
- "The Harsh Destiny of a Planet?". European Southern Observatory . 2001-05-09. Retrieved 2008-07-15.