Astronomy:HD 63454

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Short description: Star in the constellation Chamaeleon
HD 63454 / Ceibo
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Chamaeleon
Right ascension  07h 39m 21.85290s[1]
Declination −78° 16′ 44.3078″[1]
Apparent magnitude (V) 9.36±0.02[2]
Characteristics
Spectral type K3 V(k)[3]
U−B color index +0.98[4]
B−V color index +1.06[2]
Astrometry
Radial velocity (Rv)+33.8[5] km/s
Proper motion (μ) RA: −19.556[1] mas/yr
Dec.: −39.926[1] mas/yr
Parallax (π)26.5541 ± 0.0114[1] mas
Distance122.83 ± 0.05 ly
(37.66 ± 0.02 pc)
Absolute magnitude (MV)+6.68[6]
Details
Mass0.79[7] M☉
Radius0.80±0.04[8] R☉
Luminosity0.287±0.005[1] L☉
Surface gravity (log g)4.52±0.16[9] cgs
Temperature4,840±66[9] K
Metallicity [Fe/H]0.00±0.06[10] dex
Rotational velocity (v sin i)2.6[11] km/s
Age1.52[7] Gyr
Other designations
Ceibo, CD−77°298, CPD−77°324, HD 63454, HIP 37284, TYC 9385-1045-1[12]
Database references
SIMBADdata

HD 63454, formally named Ceibo, is a star located in the southern circumpolar constellation Chamaeleon near the border with Mensa. To see the star, one needs a small telescope because it has an apparent magnitude of 9.36,[2] which is below the limit for naked eye visibility. The object is located relatively close at a distance of 123 light years based on Gaia DR3 parallax measurements[1] but is receding with a heliocentric radial velocity of 33.8 km/s.[5] At its current distance, HD 63454's brightness is diminished by two tenths of a magnitude due to interstellar dust.[13] It has an absolute magnitude of +6.68.[6]

Properties

HD 63454 has a stellar classification of K3 V(k),[3] indicating that it is a K-type main-sequence star with some infilling of the calcium K and H lines.[14] It has 79% the mass of the Sun[7] and 80% the Sun's radius.[8] It radiates 28.7% the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,840 K,[9] giving it an orange hue. HD 63454 has a solar metallicity[10] and is estimated to 1.52 billion years old,[7] a third the age of the Sun. It spins modestly with a projected rotational velocity of 2.6 km/s.[11]

Planetary system

On Valentine’s Day 2005, a hot Jupiter HD 63454 b was found by Claire Moutou, Michel Mayor, and François Bouchy using the radial velocity method.[5]

After the 2019 IAU100 NameExoWorlds campaign, the International Astronomical Union, approved the names proposed from Uruguay: Ceibo for the star and Ibirapitá for the planet, respectively after the native Uruguayan tree species Erythrina crista-galli and Peltophorum dubium.[15]

These names were announced on 17 December 2019, at a press conference of the IAU in Paris, together with other 111 sets of exoplanets and host stars.[16] Ceibo and Ibirapitá were proposed by Adrián Basedas, from the Astronomical Observatory of Liceo Nº9, Montevideo, Uruguay, who won the national contest "Nombra Tu Exoplaneta",[17] organized in Uruguay, to name HD 63454 and HD 63454 b.


The HD 63454 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
Ibirapitá ≥0.25±0.01[18] MJ 0.036[5] 2.818049±0.000071[19] 0.0[5] — ~1.10[19] RJ

See also

  • List of extrasolar planets

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G. 
  4. ↑ Paunzen, E. (May 2022). "Catalogue of stars measured in the Geneva seven-colour photometric system". Astronomy & Astrophysics 661: A89. doi:10.1051/0004-6361/202142355. ISSN 0004-6361. Bibcode: 2022A&A...661A..89P. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Moutou, C.; Mayor, M.; Bouchy, F.; Lovis, C.; Pepe, F.; Queloz, D.; Santos, N. C.; Udry, S. et al. (22 July 2005). "The HARPS search for southern extra-solar planets. IV. Three close-in planets around HD 2638, HD 27894 and HD 63454". Astronomy & Astrophysics 439 (1): 367–373. doi:10.1051/0004-6361:20052826. ISSN 0004-6361. Bibcode: 2005A&A...439..367M. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 Demarque, Pierre; Woo, Jong‐Hak; Kim, Yong‐Cheol; Yi, Sukyoung K. (December 2004). "Y2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series 155 (2): 667–674. doi:10.1086/424966. ISSN 0067-0049. Bibcode: 2004ApJS..155..667D. 
  8. ↑ 8.0 8.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 9.2 Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D. et al. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics 487 (1): 373–381. doi:10.1051/0004-6361:200809698. ISSN 0004-6361. Bibcode: 2008A&A...487..373S. 
  10. ↑ 10.0 10.1 Ramírez, I.; Fish, J. R.; Lambert, D. L.; Allende Prieto, C. (13 August 2012). "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets". The Astrophysical Journal 756 (1): 46. doi:10.1088/0004-637X/756/1/46. ISSN 0004-637X. Bibcode: 2012ApJ...756...46R. 
  11. ↑ 11.0 11.1 Soto, M. G.; Jenkins, J. S. (July 2018). "Spectroscopic Parameters and Atmospheric Chemistries of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy & Astrophysics 615: A76. doi:10.1051/0004-6361/201731533. ISSN 0004-6361. Bibcode: 2018A&A...615A..76S. 
  12. ↑ "HD 63454". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+63454. 
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  14. ↑ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal 126 (4): 2048. doi:10.1086/378365. Bibcode: 2003AJ....126.2048G. 
  15. ↑ "IAU100 NameExoWorlds: Approved names". http://www.nameexoworlds.iau.org/final-results. 
  16. ↑ "IAU100 NameExoWorlds National campaigns". http://www.nameexoworlds.iau.org/get-involved. 
  17. ↑ "Nombra Tu Exoplaneta Uruguay". 17 December 2019. http://www.iau-100.edu.uy/exoplanetas/. 
  18. ↑ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (3 March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal 153 (3): 136. doi:10.3847/1538-3881/aa5df3. Bibcode: 2017AJ....153..136S. 
  19. ↑ 19.0 19.1 Kane, Stephen R.; Dragomir, Diana; Ciardi, David R.; Lee, Jae-Woo; Lo Curto, Gaspare; Lovis, Christophe; Naef, Dominique; Mahadevan, Suvrath et al. (3 August 2011). "Stellar Variability of the Exoplanet Hosting Star HD 63454". The Astrophysical Journal 737 (2): 58. doi:10.1088/0004-637X/737/2/58. ISSN 0004-637X. Bibcode: 2011ApJ...737...58K. 

External links

Coordinates: Sky map 07h 39m 21.8511s, −78° 16′ 44.300″



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