Free Astronomy Magazine January-February 2026 ARABIC VERSION

A New insight into stellar and planetary formation By Keck Observatory Meagan O’Shea n international team of as- tronomers using the com- binedpowersofspace-based andground-basedobservatories,in- cludingtheW.M.KeckObservatory andSubaruTelescopeonMaunakea, Hawai ‘ i Island, have discovered a browndwarfcompanionorbitinga nearbyreddwarfstar,providingkey insight into how stars and planets form. Located about 55 light-years fromEarth,thebrowndwarfcom- panion named J1446B, was discov- ered orbiting the nearby M dwarf J1446.Tooheavytobeaplanetbut toolighttobeanormalstar,J1446B hasamassofabout60timesthatof Jupiter and orbits its host star at a distanceroughly4.3timestheEarth– Sunseparation,completingoneor- bit in about 20 years. Remarkably,near-infraredobserva- tionsrevealedbrightnessvariations ofabout30%,suggestingdynamic JANUARY-FEBRUARY2026 رؤ ﺔﺟﺪ ﺪة ﺣﻮل ﺗ ﻮﻳﻦ اﻟﻨﺠـﻮمواﻟ ﻮ ﻛﺐا : ﻘﻠﻢ ﻣﻴﺠﺎن أوﺷ ﺎ ﻣﺮﺻﺪ ﻛ ﻚ ﺗﻤﻜـﻦ ﻓﺮﻳﻖ دوﱄ ﻣﻦ ﻋﻠﻤﺎء اﻟﻔﻠـﻚ اﻋﺘﻤـﺎد اً ﻋـﲆ اﻟﻘـﺪرا ت ا ﺸـﱰﻛﺔ ﺮاﺻـﺪ ﻓﻀـﺎﺋﻴﺔ وأرﺿﻴﺔ ﻣـﻦ ﺑﻴﻨﻬـﺎ ﻣﺮﺻـﺪ دﺑﻠﻴـﻮ إم ﻛﻴـﻚ وﺗﻠﺴﻜﻮب ﺳﻮﺑﺎرو ﻋﲆ ﻗﻤﺔ ﻣﺎوﻧﺎﻛﻴﺎ ﰲ ﺟﺰر ﻫﺎواي ﻣﻦ اﻛﺘﺸﺎف ﻗﺰم ﺑﻨـﻲ ﻣ ﺮاﻓـﻖ ﻳـﺪور ﺣﻮل ﻧﺠﻢ ﻗﺰم أﺣ ﻤﺮ ﻗﺮﻳـﺐ ﻣـﺎ ﻳـﻮﻓﺮ رؤى أﺳﺎﺳــﻴﺔ ﺣــﻮل ﻛﻴﻔﻴــﺔ ﺗﺸــﻜ ﻞ اﻟﻨﺠــﻮم واﻟﻜﻮاﻛﺐ . ﻳﻘﻊ ﻫﺬا اﻟﻨﻈﺎم ﻋﲆ ﺑُ ﻌﺪ ﻳﻘـﺎرب ٥٥ ﺳﻨﺔ ﺿﻮﺋﻴﺔ ﻣﻦ اﻷرض وﻗـﺪ ﻋﺜـﺮ ﻋـﲆ اﻟﻘﺰم اﻟﺒﻨﻲ ا ﺴﻤ ﻰ J1446B وﻫﻮ ﻳﺪور ﺣﻮل ـــــــــــــــــــــــــــــــــــــ ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 4 اﻟﻨﺠﻢ اﻟﻘﺰم ﻣـﻦ اﻟﻨـﻮع M ا ﻌـﺮوف ﺑﺎﺳـﻢ J1446 ﺰ ﻤﻴﺘوﻳ وﻫﻮ ﺑﻜﺘﻠﺔ ﺗﺠﻌﻠﻪ أﺛﻘـﻞ ﻣـﻦ أن ﻳﻌﺪ ﻛﻮﻛﺒ ﺎً وأﺧـﻒ ﻣـﻦ أن ﻳﻜـﻮن ﻧﺠﻤـ ﺎً اﻋﺘﻴﺎدﻳ ﺎً إذ ﺗﺒﻠﻎ ﻛﺘﻠﺘـﻪ ﻧﺤـﻮ 60 ﻣـﺮة ﻛﺘﻠـﺔ ﻛﻮﻛﺐ ا ﺸﱰي وﻫﻮ ﻳﺪور ﺣﻮل ﻧﺠﻤـﻪ ﻋـﲆ ﻣﺴﺎﻓﺔ ﺗﻌﺎدل ﺗﻘﺮﻳﺒ ﺎً 4.3 أﺿـﻌﺎف ا ﺴـﺎﻓﺔ ﺑ اﻟﻜﺮة اﻷرﺿـﻴﺔ واﻟﺸـﻤﺲ ﻣﻜﻤـﻼً دورة واﺣﺪة ﻛﻞ ﻧﺤﻮ 20 .ﺎً ﻋﺎﻣ واﻟﻼﻓﺖ أن اﻟﺮﺻﺪ ﰲ اﻷﺷﻌﺔ ﺗﺤـﺖ اﻟﺤﻤـﺮاء اﻟﻘﺮﻳﺒﺔ ﻛﺸﻒ ﻋﻦ ﺗﻐ ات ﰲ اﻟﺴﻄﻮع ﺗﺼـﻞ ـــــــــــــــــــــــــــــــــــــ - ﻳﻨﺎﻳﺮ ﻓﺒﺮﺍﻳﺮ 2 0 2 6