This page summarises the information held within TEPCat for the transiting planetary system HAT-P-4. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2007ApJ...670L..41K | |
| Date of discovery paper | 2007 / 8 / 14 | y / m / d |
| Data/telescope used for discovery | HAT | |
| Right ascension | 15 19 57.93 | h m s |
| Declination | +36 13 46.9 | d m s |
| Right ascension (decimal) | 229.99137 | degrees |
| Declination (decimal) | 36.22969 | degrees |
| V-band apparent magnitude | 11.00 | mag |
| K-band apparent magnitude | 9.77 | mag |
| Transit duration | 0.1775 ( 4.260 ) | day hour |
| Transit depth | 0.9 | % |
| Time of mid-transit | 2454245.81521 ± 0.00020 | HJD or BJD |
| Orbital period | 3.0565254 ± 0.0000012 | days |
| Reference for orbital ephemeris | 2012PASP..124..212S |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 6036 ± 46 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.277 ± 0.007 | dex |
| Stellar mass | 1.271 +0.120 −0.070 | Msun |
| Stellar radius | 1.600 +0.116 −0.041 | Rsun |
| Stellar logarithmic surface gravity | 4.134 +0.017 −0.038 | c.g.s. |
| Stellar mean density | 0.310 +0.016 −0.041 ( 0.437 +0.023 −0.058 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.04465 +0.00140 −0.00082 | AU |
| Planetary mass | 0.680 +0.046 −0.029 ( 216.17 +14.62 −9.22 ) | Mjup Mearth |
| Planetary radius | 1.337 +0.079 −0.035 ( 14.99 + 0.89 − 0.39 ) | Rjup Rearth |
| Planetary surface gravity | 9.42 +0.44 −0.91 2.97 +0.02 −0.04 | m/s2 log(cgs) |
| Planetary mean density | 0.266 +0.018 −0.038 ( 0.353 +0.024 −0.050 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1691 +46 −26 | K |
| Reference of detailed study | 2011MNRAS.417.2166S |
| Reference | λ (degrees) |
|---|---|
| Winn et al. (2011) | −4.9 ± 11.9 |
Page generated on 2026/01/29 John Southworth (Keele University, UK)