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99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.
Meteor-M No.2 (also known as Meteor M2) was the second Russian Meteor-M series of polar-orbit weather satellite. [1] It was launched on a Soyuz-2.1b rocket with a Fregat upper stage on 8 July 2014. It was designed to operate for 5 years.
The asteroid's provisional designation as a minor planet, "2024 YR 4", was assigned by the Minor Planet Center when its discovery was announced on 27 December 2024. [2] 2024 indicates the discovery year, the first letter, "Y", indicates that the asteroid was discovered in the second half-month of December (16 to 31 December) of that year, and "R 4" indicates that it was the 117th provisional ...
A meteor shower is at its best when the Earth passes through the densest part of the associated cosmic debris. That window, otherwise known as the shower's peak activity, is when stargazers will ...
Meteor-M №2-4 (alternatively, Meteor-M number 2-4) is a Russian meteorological satellite which is part of the Meteor-M No.2 series of satellites that are designed to replace the old Meteor-3M series of satellites.
A rebuttal in Astronomy & Geophysics countered that Loeb et al. had ignored that the amount of iridium deposited around the globe, 2.0 × 10 8 –2.8 × 10 8 kg (4.4 × 10 8 –6.2 × 10 8 lb), was too large for a comet of the size implied by the crater, and that they had overestimated likely comet impact rates.
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On 4 July 2019, the METEOR-M N2-2 satellite was launched. It operated successfully until December of the same year when it was struck by a micrometeorite. The satellite remains partially operational, however the damage forced the operators to terminate the LRPT downlink.