From the Extrasolar Planets Encyclopaedia : http://exoplanet.eu

Star : 51 Peg

THE STAR

- Basic data :			- More data :    - Basic data (from Simbad) - Most recent ref (from ADS)
	Name 51 Peg Distance 14.7 pc   Spectral Type G2 IV     Apparent Magnitude V 5.49     Mass 1.11 (± 0.06) Msun  ref. Age 4 (± 2.5) Gyr  ref. Effective Temperature 5793 (± 70) K  ref. Radius 1.266 (± 0.046) Rsun  ref. Metallicity [Fe/H] 0.2 (± 0.07)    ref. Right Asc. Coord. 22 57 27    Decl. Coord. +20 46 07

PLANET

- Basic data :
	Name 51 Peg b Discovered in 1995     Mass 0.468 (± 0.007) MJ   Semi major axis 0.052 AU   Orbital period 4.23077 (± 5e-05) days   Eccentricity 0     ω 0 deg.   Tmax VR 2497 (± 0.022) JD 2.450.000   Update 11/07/08

- Molecules detected :
	Name 51 Peg b Molecules None

- 51 Peg Remarks :

The orbital distance to the star (0.05 AU) was incompatible with theoretical predictions (A. Boss, Science, 287, 360, 1995) and has triggered speculations on orbital migration (Lin et al. 1996, Rasio et al., 1996) No second companion found (Marcy 1996) Further evidence for a planet (Hatzes et al., 1996, 1997): nonradial oscillation modes (l > 4) excluded to explain RV amplitude Further evidence for a planet (Pravdo et al., 1996) from X-ray non detection Planet or M2 star? This question was implicitely raised by a paper by the PTI team claiming that the 51 Peg system may be resolved. See the comment by G. Marcy Circumstellar disk searched for at UKIRT and KECK but not found (Trilling et al. 1999 and 2000)

- 51 Peg Other web pages :
	Geneva Observatory data Velocity curve and data (Butler and Marcy) Precise radial velocity with AFOE (Advanced Fiber Optic Echelle Spectrometer; Sylvain G. Korzennik et al., Harvard) photometric monitoring of 51 Peg at Mount Wilson (Henry et al.) versus orbital phase and Julian Date 51 Peg Web page at U. of Oregon. Sky chart (Seti League) Vanishing World (Scientific American)

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