Astronomy:HD 290327
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 23m 21.56388s[1] |
| Declination | –02° 16′ 39.4338″[1] |
| Apparent magnitude (V) | 8.99[2] |
| Characteristics | |
| Spectral type | G5IV[3] or G8V[4] |
| Apparent magnitude (B) | 9.751[2] |
| Apparent magnitude (J) | 7.683±0.026[2] |
| Apparent magnitude (H) | 7.404±0.047[2] |
| Apparent magnitude (K) | 7.271±0.027[2] |
| B−V color index | 0.761±0.033[2] |
| Astrometry | |
| Radial velocity (Rv) | +29.52±0.21[1] km/s |
| Proper motion (μ) | RA: +32.312[1] mas/yr Dec.: −97.224[1] mas/yr |
| Parallax (π) | 17.6913 ± 0.0461[1] mas |
| Distance | 184.4 ± 0.5 ly (56.5 ± 0.1 pc) |
| Absolute magnitude (MV) | 5.24[2] |
| Details[5] | |
| Mass | 0.86±0.01 M☉ |
| Radius | 0.95±0.02 R☉ |
| Luminosity | 0.747±0.004 L☉ |
| Surface gravity (log g) | 4.41±0.01 cgs |
| Temperature | 5,525±20 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 1.44±1.0[4] km/s |
| Age | 11.8±1.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 290327 is a single[7] star in the equatorial constellation of Orion. It has a yellow hue with an apparent visual magnitude of 8.99,[2] which is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 184 light years from the Sun. It is drifting away with a radial velocity of +29.5 km/s,[1] having come to within 124 light-years around a million years ago.[2]
Kazanasmas (1973) found a stellar classification of G5IV[3] for this object, matching a G-type star that is evolving along the subgiant branch. It was later given a class of G8V,[4] suggesting it is instead a G-type main-sequence star. This object is nearly twelve[5] billion years old and is spinning slowly with a projected rotational velocity of 1.4 km/s.[4] The star has 86% of the mass of the Sun and 95% of the Sun's radius. It is radiating 75% of the luminosity of the Sun from its photosphere at an effective temperature of 5,525 K. The metallicity is sub-solar,[5] meaning it has a lower abundance of elements other than hydrogen and helium compared to the Sun.
In 2009, a gas giant planet was found in orbit around the star. It is orbiting at a distance of around 3.4 astronomical unit|AU with a period of 6.7 years.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 2.54+0.17 −0.14 MJ |
3.43+0.20 −0.12 |
2443+205 −117 |
0.08+0.08 −0.03 |
— | — |
See also
- List of extrasolar planets
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 2.6 2.7 2.8 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 Kazanasmas, M. S. (1973). "Catalogue of magnitudes, color indices, spectral and luminosity classes of stars in Orion". Abastumanskaya Astrofiz. Obs., Byull. 44: 175. Bibcode: 1973AbaOB..44..175K.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Naef, Dominique; Mayor, Michel; Lo Curto, Gaspare; Bouchy, François; Lovis, Christophe; Moutou, Claire; Benz, Willy; Pepe, Francesco et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics 523: A15. doi:10.1051/0004-6361/200913616. Bibcode: 2010A&A...523A..15N. http://www.aanda.org/articles/aa/full_html/2010/15/aa13616-09/aa13616-09.html.
- ↑ 5.0 5.1 5.2 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.
- ↑ "HD 290327". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+290327.
- ↑ Ginski, C. et al. (2016). "A lucky imaging multiplicity study of exoplanet host stars – II". Monthly Notices of the Royal Astronomical Society 457 (2): 2173–2191. doi:10.1093/mnras/stw049. Bibcode: 2016MNRAS.457.2173G. https://academic.oup.com/mnras/article/457/2/2173/968721.
Coordinates: 
05h 23m 21.5647s, −02° 16′ 39.428″
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