51 Pegasi

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51 Pegasi
51 Pegasi is locatit in 100x100
51 Pegasi
51 Peg (circled) in the constellation Pegasus.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Richt ascension 22h 57m 27.98004s[1]
Declination +20° 46′ 07.7912″[1]
Apparent magnitude (V) 5.49[2]
Chairactereestics
Spectral type G2IV[3]
Apparent magnitude (B) 6.16[4]
Apparent magnitude (R) 5.0[4]
Apparent magnitude (I) 4.7[4]
Apparent magnitude (J) 4.66[4]
Apparent magnitude (H) 4.23[4]
Apparent magnitude (K) 3.91[2]
U−B colour index +0.20[5]
B−V colour index +0.67[5]
V−R colour index 0.37
R−I colour index 0.32
Astrometry
Radial velocity (Rv)−33.7 km/s
Proper motion (μ) RA: 207.25 ± 0.31[1] mas/yr
Dec.: 60.34 ± 0.30[1] mas/yr
Parallax (π)64.07 ± 0.38[1] mas
Distance50.9 ± 0.3 ly
(15.61 ± 0.09 pc)
Absolute magnitude (MV)4.48[6]
Details
Mass1.11[7] M
Radius1.237 ± 0.047[2] R
Luminosity1.36±0.02[6] L
Surface gravity (log g)4.33[8] cgs
Temperatur5768±8[6] K
Metallicity [Fe/H]+0.20[8] dex
Rotation21.9 ± 0.4 days[9]
Age6.1±0.6[6] Gyr
Ither designations
Helvetios, 51 Peg, GJ 882, HR 8729, BD +19°5036, HD 217014, LTT 16750, GCTP 5568.00, SAO 90896, HIP 113357[10]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia
data

51 Pegasi (abbreviatid 51 Peg), an aw named Helvetios,[11] is a Sun-lik starn locatit 50.9 light-years (15.6 parsecs)[1] frae Yird in the constellation o Pegasus. It wis the first main-sequence starn foond tae hae an exoplanet (designatit 51 Pegasi b, offeecially named Dimidium, umwhile unoffeecially dubbed Bellerophon) orbitin it.[12]

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 2.2 van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal (abstract). 694 (2): 1085–1098. arXiv:0901.1206Freely accessible. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. 
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. 
  4. 4.0 4.1 4.2 4.3 4.4 Monet, David G.; et al. (February 2003). "The USNO-B Catalog". The Astronomical Journal. 125 (2): 984–993. arXiv:astro-ph/0210694Freely accessible. Bibcode:2003AJ....125..984M. doi:10.1086/345888. 
  5. 5.0 5.1 Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J. 
  6. 6.0 6.1 6.2 6.3 Mittag, M.; Schröder, K.-P.; Hempelmann, A.; González-Pérez, J. N.; Schmitt, J. H. M. M. (2016). "Chromospheric activity and evolutionary age of the Sun and four solar twins". Astronomy & Astrophysics. 591: A89. arXiv:1607.01279Freely accessible. Bibcode:2016A&A...591A..89M. doi:10.1051/0004-6361/201527542. 
  7. Poppenhäger, K.; et al. (December 2009), "51 Pegasi – a planet-bearing Maunder minimum candidate", Astronomy and Astrophysics, 508 (3): 1417–1421, arXiv:0911.4862Freely accessible, Bibcode:2009A&A...508.1417P, doi:10.1051/0004-6361/200912945 
  8. 8.0 8.1 Frasca, A.; et al. (December 2009). "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. arXiv:0911.0760Freely accessible. Bibcode:2009A&A...508.1313F. doi:10.1051/0004-6361/200913327. 
  9. Simpson, E. K.; et al. (November 2010), "Rotation periods of exoplanet host stars", Monthly Notices of the Royal Astronomical Society, 408 (3): 1666–1679, arXiv:1006.4121Freely accessible, Bibcode:2010MNRAS.408.1666S, doi:10.1111/j.1365-2966.2010.17230.x  [as "HD 217014"]
  10. "51 Peg – Star suspected of Variability". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2011-12-17. 
  11. "IAU Catalog of Star Names". Retrieved 28 July 2016. 
  12. Mayor, Michael; Queloz, Didier (1995). "A Jupiter-mass companion to a solar-type star". Nature. 378 (6555): 355–359. Bibcode:1995Natur.378..355M. doi:10.1038/378355a0. 

Coordinates: Sky map 22h 57m 28.0s, +20° 46′ 08″