Astronomy:HD 98219
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 17m 47.5531s[1] |
| Declination | –23° 58′ 31.4952″[1] |
| Apparent magnitude (V) | +8.05[2] |
| Characteristics | |
| Spectral type | K0III/IV[3] |
| Astrometry | |
| Radial velocity (Rv) | -10.30[1] km/s |
| Proper motion (μ) | RA: −130.770±0.068[1] mas/yr Dec.: −16.887±0.050[1] mas/yr |
| Parallax (π) | 8.7662 ± 0.0489[1] mas |
| Distance | 372 ± 2 ly (114.1 ± 0.6 pc) |
| Absolute magnitude (MV) | +2.6[4] |
| Details | |
| Mass | 1.41[2] M☉ |
| Radius | 4.6[2] R☉ |
| Luminosity | 8.284[1] L☉ |
| Surface gravity (log g) | 3.36[2] cgs |
| Temperature | 4,925[2] K |
| Age | 4[4] Gyr |
| Database references | |
| SIMBAD | data |
HD 98219, also named Hunahpú, is a subgiant star in the constellation Crater. It has a confirmed exoplanet. At around 4 billion years old, it is a star around 1.3 times as massive as the Sun that has cooled and expanded to 4.5 times the Sun's diameter, brightening to be around 11 times as luminous.[4] The International Astronomical Union (IAU) gave the opportunity to Honduras to name the star Hunahpú as part of NameExoWorlds. Hunahpú was one of the twin gods who became the Sun in K'iche' (Quiché) Mayan mythology.[5]
Planetary system
A gas giant planet with a minimum mass almost double that of Jupiter was discovered as part of a radial velocity survey of subgiant stars at Keck Observatory.[4] The International Astronomical Union (IAU) has named it Ixbalanqué, the twin brother of Hunahpú.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Ixbalanqué | ≥1.964±0.099 MJ | 1.26±0.12 | 433.8±2.0 | 0.079±0.040 | — | — |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Luhn, Jacob K. et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal 157 (4): 149. doi:10.3847/1538-3881/aaf5d0. Bibcode: 2019AJ....157..149L.
- ↑ Houk, N.; Smith-Moore, M. (1988). Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. Bibcode: 1988mcts.book.....H.
- ↑ 4.0 4.1 4.2 4.3 Johnson, John Asher et al. (2011). "Retired a Stars and Their Companions. VII. 18 New Jovian Planets". The Astrophysical Journal Supplement Series 197 (2): 26. doi:10.1088/0067-0049/197/2/26. Bibcode: 2011ApJS..197...26J.
- ↑ 5.0 5.1 "Name ExoWorlds Honduras". IAU. http://www.nameexoworlds.iau.org/honduras.
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