HD 98219
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h17m47.5531s[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 ± 0.0489mas[1] |
| Distance | 372 ± 2ly (114.1 ± 0.6pc) |
| Absolute magnitude(MV) | +2.6[4] |
| Details | |
| Mass | 1.41[2]M☉ |
| Radius | 4.6[2]R☉ |
| Luminosity | 8.284[1]L☉ |
| Surface gravity(logg) | 3.36[2]cgs |
| Temperature | 4,925[2]K |
| Age | 4[4]Gyr |
| Database references | |
| SIMBAD | data |
HD 98219,also namedHunahpú,is asubgiant starin the constellationCrater.It has a confirmedexoplanet.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 starHunahpúas part ofNameExoWorlds.Hunahpúwas one of the twin gods who became the Sun inK'iche'(Quiché) Mayan mythology.[5]
Planetary system
[edit]Agas giantplanet with a minimum mass almost double that ofJupiterwas discovered as part of aradial velocitysurvey of subgiant stars atKeck Observatory.[4]The International Astronomical Union (IAU) has named itIxbalanqué,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±0.099MJ | 1.26±0.12 | 433.8±2.0 | 0.079±0.040 | — | — |
References
[edit]- ^abcdefgBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcdefLuhn, 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.arXiv:1811.03043.Bibcode:2019AJ....157..149L.doi:10.3847/1538-3881/aaf5d0.S2CID102486961.
- ^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.
- ^abcdJohnson, John Asher; et al. (2011)."Retired a Stars and Their Companions. VII. 18 New Jovian Planets".The Astrophysical Journal Supplement Series.197(2). 26.arXiv:1108.4205.Bibcode:2011ApJS..197...26J.doi:10.1088/0067-0049/197/2/26.
- ^ab"Name ExoWorlds Honduras".NameExoWorlds.IAU.Retrieved21 December2019.
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