astro.wikisort.org - Planet
HD 98649 is a G-type yellow dwarf star, classified as a G4V, that has approximately the same mass and diameter as the Sun, but has only 86% of its luminosity. It is considered a solar analog.[4] HD 98649 is about 138 light-years from earth. HD 98649 is found in the Crater constellation.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 20m 51.76855s[1] |
| Declination | −23° 13′ 02.4295″[1] |
| Apparent magnitude (V) | +8.00[2] |
| Characteristics | |
| Spectral type | G4V |
| B−V color index | +0.658 ± 0.003[3] |
| Astrometry | |
| Radial velocity (Rv) | 4.25±0.12[1] km/s |
| Proper motion (μ) | RA: −199.735±0.022 mas/yr[1] Dec.: −177.620±0.017 mas/yr[1] |
| Parallax (π) | 23.7206 ± 0.0216 mas[1] |
| Distance | 137.5 ± 0.1 ly (42.16 ± 0.04 pc) |
| Absolute magnitude (MV) | +4.91[2] |
| Details | |
| Mass | 0.97±0.02[4] M☉ |
| Radius | ~1[2] R☉ |
| Luminosity (bolometric) | 0.968±0.019[4] L☉ |
| Luminosity (visual, LV) | 0.83[note 1] L☉ |
| Surface gravity (log g) | 4.38 ± 0.08[2] cgs |
| Temperature | 5759 ± 35[2] K |
| Metallicity [Fe/H] | –0.02 ± 0.03[2] dex |
| Rotation | 27 ± 4.0 days[2] |
| Rotational velocity (v sin i) | 1.19[2] km/s |
| Age | 4.44+0.68 −0.58[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Planetary system
From 1998 to 2012, the star was under observance from the CORALIE echelle spectrograph at La Silla Observatory.
In 2012, a long-period, wide-orbiting planet was deduced by radial velocity. This was published in November.
The discoverers noted, "HD 98649b is in the top five of the most eccentric planetary orbit and the most eccentric planet known with a period larger than 600 days." The reason for this eccentricity is unknown. They also submit it as a candidate for direct imaging, once it gets out to 10.4 AU at apoastron and 250 milliarcseconds of separation relative to Earth.[2]
Using astrometry from Gaia, astronomers were able to deduce the true mass of HD 98649 b as 9.7 MJ, somewhat higher than its minimum mass from radial velocity.[4][5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.7+2.3 −1.9 MJ |
5.97+0.24 −0.21 |
14.74+0.88 −0.75 |
0.852+0.033 −0.022 |
43.7+13 −8.1° |
— |
References
- Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639. S2CID 59467665.
- 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. S2CID 18759600.Vizier catalog entry
- Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline; Mitra, Elena L. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv:2109.10422. Bibcode:2021AJ....162..266L. doi:10.3847/1538-3881/ac27ab. S2CID 237592581.
- Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21). arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57.
Notes
- Taking the absolute visual magnitude of HD 98649 and the absolute visual magnitude of the Sun , the visual luminosity can be calculated by
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На других языках
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HD 98649 — звезда в созвездии Чаши на расстоянии около 131 светового года от нас. Вокруг звезды обращается, как минимум, одна планета.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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