Astronomy:HD 37605
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 40m 01.7281s[1] |
| Declination | +06° 03′ 38.0743″[1] |
| Apparent magnitude (V) | 8.67[2] |
| Characteristics | |
| Spectral type | K0 V[3] |
| B−V color index | 0.827±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.81±0.25[1] km/s |
| Proper motion (μ) | RA: 52.466±0.089[1] mas/yr Dec.: −247.255±0.076[1] mas/yr |
| Parallax (π) | 21.3450 ± 0.0517[1] mas |
| Distance | 152.8 ± 0.4 ly (46.8 ± 0.1 pc) |
| Absolute magnitude (MV) | 5.46[2] |
| Details[4] | |
| Mass | 0.98±0.01 M☉ |
| Radius | 0.89±0.01 R☉ |
| Luminosity | 0.602±0.002 L☉ |
| Surface gravity (log g) | 4.52±0.01 cgs |
| Temperature | 5,380±13 K |
| Metallicity [Fe/H] | 0.25±0.04[5] dex |
| Rotation | 57.67[3] days |
| Rotational velocity (v sin i) | 4.5[6] km/s |
| Age | 1.8±1.0 or 7[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 37605 is a star in the equatorial constellation of Orion. It is orange in hue but is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.67.[2] Parallax measurements yield a distance estimate of 153 light years from the Sun. It has a high proper motion[3] and is drifting closer with a radial velocity of −22 km/s.[1]
This object is a K-type main-sequence star with a stellar classification of K0 V.[3] It is an inactive, metal-rich star. Age estimates range from 1.8[4] up to 7[3] billion years old, and it is spinning with a projected rotational velocity of 4.5 km/s.[6] The star has 98% of the mass of the Sun and 89% of the Sun's radius. It is radiating 60% of the luminosity of the Sun from its photosphere at an effective temperature of 5,380 K.[4]
Planets
There are two giant planets known in orbit. Planet b was discovered in 2004[8] and planet c was discovered eight years later. The planets do not transit relative to Earth; b's maximum inclination is 88.1%.[3][9]
In a simulation, HD 37605 b's orbit "sweeps clean" most test particles within 0.5 AU; leaving only asteroids "in low-eccentricity orbits near the known planet’s apastron distance, near the 1:2 mean-motion resonance" with oscillating eccentricity up to 0.06, and also at 1:3 with oscillating eccentricity up to 0.4. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less; which still allows for planets at 0.8 AU or more.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.69±0.3 MJ | 0.277±0.015 | 55.01292±0.00062 | 0.6745±0.0019 | — | — |
| c | ≥3.19±0.38 MJ | 3.74±0.21 | 2720±15 | 0.03±0.012 | — | — |
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 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Wang Xuesong, Sharon et al. (2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". Astrophysical Journal 761 (1): 46. doi:10.1088/0004-637X/761/1/46. Bibcode: 2012ApJ...761...46W.
- ↑ 4.0 4.1 4.2 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html.
- ↑ Aguilera-Gómez, Claudia et al. (2018). "Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert". Astronomy and Astrophysics 614: A55. doi:10.1051/0004-6361/201732209. Bibcode: 2018A&A...614A..55A.
- ↑ 6.0 6.1 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode: 2017AJ....153...21L.
- ↑ "HD 37605". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+37605.
- ↑ Cochran, Michael et al. (2004). "The First Hobby-Eberly Telescope Planet: A Companion to HD 37605". The Astrophysical Journal Letters 611 (2): L133–L136. doi:10.1086/423936. Bibcode: 2004ApJ...611L.133C.
- ↑ Kane, S. (2012). "The TERMS Project: More Than Just Transit Exclusion". OASIS 44 (228.07). Bibcode: 2012AAS...21922807K. http://www.abstractsonline.com/Plan/ViewAbstract.aspx?sKey=ca3fe43b-0d3d-4ef8-8872-5c048b7dd028&cKey=f76c07ea-7315-4f15-969d-8aa3cbadecbf&mKey=%7b25369F54-5CB0-4639-BC20-B20273090B9A%7d#.
- ↑ Wittenmyer, Robert A. et al. (2007). "Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems". The Astronomical Journal 134 (3): 1276–1284. doi:10.1086/520880. Bibcode: 2007AJ....134.1276W. http://www.iop.org/EJ/article/1538-3881/134/3/1276/205882.html.
- ↑ Ment, Kristo et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal 156 (5): 213. doi:10.3847/1538-3881/aae1f5. Bibcode: 2018AJ....156..213M.
External links
Coordinates: 
05h 40m 01.7296s, +06° 03′ 38.085″
 |  |
