HD 215497

Jump to content
Coordinates: Sky map 22h 46m 36.7543s, −56° 35′ 58.322″
From Wikipedia, the free encyclopedia
HD 215497
Observation data
Epoch J2000.0      Equinox J2000.0
ConstellationTucana
Right ascension22h 46m 36.75396s[1]
Declination−56° 35′ 58.3285″[1]
Apparent magnitude (V)8.96[2]
Characteristics
Spectral typeK3V[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−V color index0.953±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±0.0324 mas[1]
Distance132.4 ± 0.2 ly
(40.59 ± 0.05 pc)
Absolute magnitude (MV)5.77[3]
Details[4]
Mass0.86±0.02 M☉
Radius0.87±0.02 R☉
Luminosity0.47±0.02 L☉
Surface gravity (log g)4.49±0.03 cgs
Temperature5,128±12 K
Metallicity [Fe/H]0.23±0.07[2] dex
Rotational velocity (v sin i)1.67[2] km/s
Age9.9±2.8 Gyr
Other designations
CPD−57°10139, HD 215497, HIP 112441, SAO 247578, PPM 350516, TYC 8826-00247-1, 2MASS J22463675-5635584[5]
Database references
SIMBADdata
Exoplanet Archivedata

HD 215497 is a single[4] star in the southern constellation of Tucana. It has an orange hue with an apparent visual magnitude of 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 300 astronomical units.[6] Based on parallax measurements,[1] it is located at a distance of 132 light years from the Sun. The star is drifting further away with a radial velocity of +49 km/s, having come as close as 45 light-years some 774,000 years ago.[3] The absolute magnitude of this star is 5.77.[3]

The stellar classification of HD 215497 is K3V,[2] indicating this is a K-type main-sequence star that is generating energy through core hydrogen fusion. The star is about ten[4] billion years old with a low magnetic activity level and is spinning with a projected rotational velocity of 1.67 km/s.[2] It is smaller than the Sun, with 86% of the Sun's mass and 87% of the radius.[4] This is a metal-rich star, which means the abundance of heavier elements in the atmosphere is significantly higher than in the Sun.[2] It is radiating 47% of the luminosity of the Sun from its photosphere at an effective temperature of 5,128 K.[4]

Planetary system

[edit]

Announced in 2009, two extrasolar planets were discovered to be orbiting the star.[2] Both planets are less massive than Jupiter. The inner exoplanet HD 215497 b orbits very close to the star and is termed a "hot super-Earth". The outer exoplanet HD 215497 c is a giant planet that orbits a little bit further from the star than the Earth, at around 1.282 AU, with a high eccentricity. A check for transits of the inner planet did not reveal any passages.[7]

The HD 215497 planetary system[2]
Companion
(in order from star)		MassSemimajor axis
(AU)		Orbital period
(days)		EccentricityInclinationRadius
b≥6.6 M🜨0.0473.93404 ± 0.000660.16 ± 0.09——
c≥0.33 MJ1.282567.94 ± 2.700.49 ± 0.04——

References

[edit]
  1. ^ a b c d e f 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 g h i j Lo 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.
  3. ^ a b c d e f g h i Anderson, 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. S2CID 119257644.
  4. ^ a b c d e Bonfanti, 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. S2CID 53971692. A5.
  5. ^ "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
  6. ^ 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. Retrieved 19 June 2020.
  7. ^ 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. S2CID 86862862. A117.


Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_215497&oldid=1328545281"
    HD 215497
    Observation data
    Epoch J2000.0      Equinox J2000.0
    ConstellationTucana
    Right ascension22h 46m 36.75396s[1]
    Declination−56° 35′ 58.3285″[1]
    Apparent magnitude (V)8.96[2]
    Characteristics
    Spectral typeK3V[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−V color index0.953±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±0.0324 mas[1]
    Distance132.4 ± 0.2 ly
    (40.59 ± 0.05 pc)
    Absolute magnitude (MV)5.77[3]
    Details[4]
    Mass0.86±0.02 M☉
    Radius0.87±0.02 R☉
    Luminosity0.47±0.02 L☉
    Surface gravity (log g)4.49±0.03 cgs
    Temperature5,128±12 K
    Metallicity [Fe/H]0.23±0.07[2] dex
    Rotational velocity (v sin i)1.67[2] km/s
    Age9.9±2.8 Gyr
    Other designations
    CPD−57°10139, HD 215497, HIP 112441, SAO 247578, PPM 350516, TYC 8826-00247-1, 2MASS J22463675-5635584[5]
    Database references
    SIMBADdata
    Exoplanet Archivedata

    HD 215497 is a single[4] star in the southern constellation of Tucana. It has an orange hue with an apparent visual magnitude of 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 300 astronomical units.[6] Based on parallax measurements,[1] it is located at a distance of 132 light years from the Sun. The star is drifting further away with a radial velocity of +49 km/s, having come as close as 45 light-years some 774,000 years ago.[3] The absolute magnitude of this star is 5.77.[3]

    The stellar classification of HD 215497 is K3V,[2] indicating this is a K-type main-sequence star that is generating energy through core hydrogen fusion. The star is about ten[4] billion years old with a low magnetic activity level and is spinning with a projected rotational velocity of 1.67 km/s.[2] It is smaller than the Sun, with 86% of the Sun's mass and 87% of the radius.[4] This is a metal-rich star, which means the abundance of heavier elements in the atmosphere is significantly higher than in the Sun.[2] It is radiating 47% of the luminosity of the Sun from its photosphere at an effective temperature of 5,128 K.[4]

    Planetary system

    Announced in 2009, two extrasolar planets were discovered to be orbiting the star.[2] Both planets are less massive than Jupiter. The inner exoplanet HD 215497 b orbits very close to the star and is termed a "hot super-Earth". The outer exoplanet HD 215497 c is a giant planet that orbits a little bit further from the star than the Earth, at around 1.282 AU, with a high eccentricity. A check for transits of the inner planet did not reveal any passages.[7]

    The HD 215497 planetary system[2]
    Companion
    (in order from star)    		MassSemimajor axis
    (AU)    		Orbital period
    (days)    		EccentricityInclinationRadius
    b≥6.6 M🜨0.0473.93404 ± 0.000660.16 ± 0.09——
    c≥0.33 MJ1.282567.94 ± 2.700.49 ± 0.04——

    References

    1. ^ a b c d e f 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 g h i j Lo 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.
    3. ^ a b c d e f g h i Anderson, 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. S2CID 119257644.
    4. ^ a b c d e Bonfanti, 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. S2CID 53971692. A5.
    5. ^ "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
    6. ^ 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. Retrieved 19 June 2020.
    7. ^ 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. S2CID 86862862. A117.


    Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_215497&oldid=1328545281"