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Superbolides, i.e. extremely bright meteors produced by entries ofmeter-sized bodies into terrestrial atmosphere, are rare events. We presenthere detailed analysis of a superbolide, which occurred over Romania on January7, 2015. The trajectory, velocity, and orbit were determined using two all-skyphotographs from a station of the European Fireball Network (EN) in Slovakiaand five casual video records from Romania, which were carefully calibrated.Bolide light curve was measured by EN radiometers. We found that the entryspeed was 27.76 $\pm$ 0.19 km/s, significantly lower than reported by USGovernment sensors. The orbit was asteroidal with low inclination and aphelioninside Jupiter's orbit. The atmospheric behavior was, however, not typical foran asteroidal body. The peak brightness of absolute magnitude of -21 wasreached at a quite large height of 42.8 km and the brightness then decreasedquickly. The bolide almost disappeared at a height of 38.7 km, leaving just astationary luminous trail visible for several seconds. Only one small fragmentcontinued until the height of 36 km. Brief meteorite searches wereunsuccessful. The modeling of the light curve revealed that the body of initialmass of about 4500 kg remained almost intact until the dynamic pressure reached0.9 MPa but it was then quickly disintegrated into many tiny fragments and dustunder 1-3 MPa. A comparison was made with three other superbolides for which wehave radiometric light curves: ordinary chondrite fall Ko\v{s}ice, carbonaceouschondrite fall Maribo, and cometary Taurid bolide of October 31, 2015. TheRomanian superbolide was not similar to any of these and represents probably anew type of material with intrinsic strength of about 1 MPa.

The January 7, 2015, superbolide over Romania and structural diversity of meter-sized asteroids