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TYC 2463-281-1



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HAT-P-9b: A Low-Density Planet Transiting a Moderately Faint F Star
We report the discovery of a planet transiting a moderately faint (V =12.3 mag) late F star, with an orbital period of 3.92289 ±0.00004 days. From the transit light curve and radial velocitymeasurements, we determine that the radius of the planet isRp = 1.40 ± 0.06 R Jup and that the mass isMp = 0.78 ± 0.09 M Jup. The density of thenew planet, ρ p = 0.35 ± 0.06 g cm-3,fits to the low-density tail of the currently known transiting planets.We find that the center of transit is at T c = 2454417.9077± 0.0003 (HJD), and the total transit duration is 0.143 ±0.004 days. The host star has M sstarf = 1.28 ± 0.13 Msun and R sstarf = 1.32 ± 0.07 Rsun.Based in part on radial velocities obtained with the SOPHIE spectrographmounted on the 1.93 m telescope at the Observatoire de Haute Provence,France (runs 07A.PNP.MAZE, 07B.PNP.MAZE, 08A.PNP.MAZE).

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Observation and Astrometry data

Right ascension:07h20m40.48s
Apparent magnitude:12.343
Proper motion RA:-8.5
Proper motion Dec:-13.3
B-T magnitude:12.353
V-T magnitude:12.344

Catalogs and designations:
Proper Names   (Edit)
TYCHO-2 2000TYC 2463-281-1
USNO-A2.0USNO-A2 1200-05564533

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