| 词条 | KELT-2Ab |
| 释义 |
| name = KELT-2Ab | discoverer = KELT-North | discovered = 7 June 2012 | discovery_method = Transit | apsis = astron | semimajor = {{convert|0.5504|±|0.00086|AU|km|abbr=on}} | eccentricity = 0 | period = 4.1137913 ± 0.00001 d | inclination = 88.56 ± 1.14 | time_periastron = 2455974.60338 ± 0.00083 | arg_peri = 90 | semi-amplitude = 161.1 ± 7.8 | star = KELT-2A | mean_radius = 1.290 ± 0.057 {{Jupiter radius|link=y}} | mass = 1.524 ± 0.088 {{Jupiter mass|link=y}} | density = {{convert|940|±|90|kg/m3|lk=on|abbr=on}} | surface_grav = {{convert|22.7|m/s2|lk=on|abbr=on}} 2.3 g }} KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 440 light-years away in the constellation of Auriga. It was discovered by the KELT-North survey via the transit method, so both its mass and radius are known quite precisely. As of its discovery KELT-2Ab is the fifth-brightest transiting Hot Jupiter known that has a well constrained mass. This makes the KELT-2A system a promising target for future space- and ground-based follow-up observations to learn about the planet's atmosphere. The star KELT-2A is a member of the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 astronomical units away. See also
References}} External links
5 : Auriga (constellation)|Hot Jupiters|Transiting exoplanets|Exoplanets discovered in 2012|Giant planets |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。