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TYC 2340-1714-1



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HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf
We report on the discovery of HAT-P-10b, one of the lowest mass (0.487± 0.018 M J) transiting extrasolar planets (TEPs)discovered to date by transit searches. HAT-P-10b orbits the moderatelybright V = 11.89 K dwarf GSC 02340-01714, with a period P = 3.7224747± 0.0000065 days, transit epoch Tc = 2454759.68683± 0.00016 (BJD), and duration 0.1090 ± 0.0008 days.HAT-P-10b has a radius of 1.005+0.032–0.027 R J yielding a mean density of0.594 ± 0.052 g cm–3. Comparing theseobservations with recent theoretical models we find that HAT-P-10b isconsistent with a ~4.5 Gyr, almost pure hydrogen and helium gas giantplanet with a 10 M ⊕ core. With an equilibriumtemperature of T eq = 1020 ± 17 K, HAT-P-10b is one ofthe coldest TEPs. Curiously, its Safronov number θ = 0.053± 0.002 falls close to the dividing line between the twosuggested TEP populations.Based in part on observations obtained at the W. M. Keck Observatory,which is operated by the University of California and the CaliforniaInstitute of Technology. Keck time has been granted by NOAO (A285Hr) andNASA (N128Hr).

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Observation and Astrometry data

Right ascension:03h09m28.54s
Apparent magnitude:11.574
Proper motion RA:-4
Proper motion Dec:-49.4
B-T magnitude:12.845
V-T magnitude:11.679

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 2340-1714-1
USNO-A2.0USNO-A2 1200-01409567

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