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(Redirected from HD 98219 b)
HD 98219 / Hunahpú
Observation data
Epoch J2000.0       Equinox J2000.0
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  mas [1]
Distance372 ± 2  ly
(114.1 ± 0.6  pc)
Absolute magnitude (MV)+2.6 [4]
Details
Mass1.41 [2]  M
Radius4.6 [2]  R
Luminosity8.284 [1]  L
Surface gravity (log g)3.36 [2]  cgs
Temperature4,925 [2]  K
Age4 [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]

The HD 98219 planetary system [2]
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. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data 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 source at VizieR.
  2. ^ a b c d e f 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. arXiv: 1811.03043. Bibcode: 2019AJ....157..149L. doi: 10.3847/1538-3881/aaf5d0. S2CID  102486961.
  3. ^ 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. ^ a b c d 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. arXiv: 1108.4205. Bibcode: 2011ApJS..197...26J. doi: 10.1088/0067-0049/197/2/26.
  5. ^ a b "Name ExoWorlds Honduras". NameExoWorlds. IAU. Retrieved 21 December 2019.


From Wikipedia, the free encyclopedia
(Redirected from HD 98219 b)
HD 98219 / Hunahpú
Observation data
Epoch J2000.0       Equinox J2000.0
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  mas [1]
Distance372 ± 2  ly
(114.1 ± 0.6  pc)
Absolute magnitude (MV)+2.6 [4]
Details
Mass1.41 [2]  M
Radius4.6 [2]  R
Luminosity8.284 [1]  L
Surface gravity (log g)3.36 [2]  cgs
Temperature4,925 [2]  K
Age4 [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]

The HD 98219 planetary system [2]
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. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data 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 source at VizieR.
  2. ^ a b c d e f 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. arXiv: 1811.03043. Bibcode: 2019AJ....157..149L. doi: 10.3847/1538-3881/aaf5d0. S2CID  102486961.
  3. ^ 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. ^ a b c d 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. arXiv: 1108.4205. Bibcode: 2011ApJS..197...26J. doi: 10.1088/0067-0049/197/2/26.
  5. ^ a b "Name ExoWorlds Honduras". NameExoWorlds. IAU. Retrieved 21 December 2019.



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