HD 215497
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 22h46m36.75396s[1] |
| Declination | −56° 35′ 58.3285″[1] |
| Apparent magnitude(V) | 8.96[2] |
| Characteristics | |
| Spectral type | K3V[2] |
| Apparent magnitude(B) | 9.913[3] |
| Apparent magnitude(J) | 7.339±0.024[3] |
| Apparent magnitude(H) | 6.917±0.053[3] |
| Apparent magnitude(K) | 6.784±0.024[3] |
| B−Vcolor index | 0.953±0.025[3] |
| Astrometry | |
| Radial velocity(Rv) | +49.31[3]km/s |
| Proper motion(μ) | RA:−54.660±0.041[1]mas/yr Dec.:−61.028±0.045[1]mas/yr |
| Parallax(π) | 24.6339 ± 0.0324mas[1] |
| Distance | 132.4 ± 0.2ly (40.59 ± 0.05pc) |
| Absolute magnitude(MV) | 5.77[3] |
| Details[4] | |
| Mass | 0.86±0.02M☉ |
| Radius | 0.87±0.02R☉ |
| Luminosity | 0.47±0.02L☉ |
| Surface gravity(logg) | 4.49±0.03cgs |
| Temperature | 5,128±12K |
| Metallicity[Fe/H] | 0.23±0.07[2]dex |
| Rotational velocity(vsini) | 1.67[2]km/s |
| Age | 9.9±2.8Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 215497is a single[4]starin the southernconstellationofTucana.It has an orange hue with anapparent visual magnitudeof 8.96,[2]which is too dim to be viewed with the naked eye. A 2015 survey ruled out the existence of any stellar companions at projected distances from 26 to 300astronomical units.[6]Based onparallaxmeasurements,[1]it is located at a distance of 132light yearsfrom theSun.The star is drifting further away with aradial velocityof +49 km/s, having come as close as 45 light-years some 774,000 years ago.[3]Theabsolute magnitudeof this star is 5.77.[3]
Thestellar classificationof HD 215497 is K3V,[2]indicating this is aK-type main-sequence starthat is generating energy throughcorehydrogen fusion.The star is about ten[4]billion years old with a lowmagnetic activitylevel and is spinning with aprojected rotational velocityof 1.67 km/s.[2]It is smaller than the Sun, with 86% of theSun's massand 87% of theradius.[4]This is ametal-richstar, which means the abundance of heavier elements in theatmosphereis significantly higher than in the Sun.[2]It is radiating 47% of theluminosity of the Sunfrom itsphotosphereat aneffective temperatureof 5,128 K.[4]
Planetary system
[edit]Announced in 2009, twoextrasolar planetswere discovered to be orbiting the star.[2]Both planets are less massive thanJupiter.The inner exoplanetHD 215497 borbits very close to the star and is termed a "hot super-Earth".Theouter exoplanetHD 215497 cis agiant planetthat orbits a little bit further from the star than theEarth,at around1.282AU,with a high eccentricity. A check fortransitsof the inner planet did not reveal any passages.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.6M🜨 | 0.047 | 3.93404 ± 0.00066 | 0.16 ± 0.09 | — | — |
| c | ≥0.33MJ | 1.282 | 567.94 ± 2.70 | 0.49 ± 0.04 | — | — |
References
[edit]- ^abcdefBrown, 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.
- ^abcdefghijLo Curto, G.; et al. (2015)."The HARPS search for southern extra-solar planets. XXII. Multiple planet systems from the HARPS volume limited sample".Astronomy and Astrophysics.512.A48.arXiv:1411.7048.Bibcode:2010A&A...512A..48L.doi:10.1051/0004-6361/200913523.
- ^abcdefghiAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.
- ^abcdeBonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars".Astronomy & Astrophysics.585:14.arXiv:1511.01744.Bibcode:2016A&A...585A...5B.doi:10.1051/0004-6361/201527297.S2CID53971692.A5.
- ^"HD 215497".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-11-08.
- ^Mugrauer, M.; Ginski, C. (12 May 2015)."High-contrast imaging search for stellar and substellar companions of exoplanet host stars".Monthly Notices of the Royal Astronomical Society.450(3): 3127–3136.Bibcode:2015MNRAS.450.3127M.doi:10.1093/mnras/stv771.hdl:1887/49340.Retrieved19 June2020.
- ^Gillon, M.; et al. (May 2017). "The Spitzer search for the transits of HARPS low-mass planets. II. Null results for 19 planets".Astronomy & Astrophysics.601:23.arXiv:1701.01303.Bibcode:2017A&A...601A.117G.doi:10.1051/0004-6361/201629270.S2CID86862862.A117.
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