Radar image of 2023 BU by the Goldstone Solar System Radar on 29 January 2023
Discovery[1][2]
Discovered by
Gennadiy Borisov
Discovery site
MARGO, Nauchnyi, Crimea
Discovery date
21 January 2023
Designations
MPC designation
2023 BU
Alternative designations
gb00553
Minor planet category
NEO · Apollo
Orbital characteristics[3]
Epoch 25 February 2023 (JD 2460000.5) (Post-flyby orbit)
Uncertainty parameter 1
Observation arc
10 days (231 obs)[3]
Aphelion
1.230 AU
Perihelion
0.9840 AU
Semi-major axis
1.107 AU
Eccentricity
0.1111
Orbital period (sidereal)
1.16 yr
Mean anomaly
28.7°
Inclination
3.75°
Longitude of ascending node
125.5°
Time of perihelion
27 January 2023 04:30[4]
Argument of perihelion
355.8°
Earth MOID
0.00046 AU (69,000 km; 0.18 LD)
Physical characteristics
Mean diameter
3–8 meters (CNEOS)[5]
Synodic rotation period
~77 seconds[6]
Absolute magnitude (H)
29.4±0.5 (JPL)[3] 29.4 (MPC)[1]
2023 BU is a near-Earth object that passed 9,967 ± 1 km (6,193.21 ± 0.62 mi) from the centerpoint of Earth around 27 January 2023 00:29 UT.[3] Since Earth's radius is about 6,378 km (3,963 mi), it was expected to pass approximately 3,589 ± 1 km (2,230.10 ± 0.62 mi) from the surface of Earth over the southern tip of South America.[7] It passed at an altitude above low Earth orbit which is 2,000 km (1,200 mi) and below geostationary orbit which is 36,000 km (22,000 mi). The asteroid is about 3–8 meters in diameter[5] and approached Earth from the night sky. It is the fourth closest non-impacting approach known to Earth (excluding Earthgrazers) after 2020 VT4, 2020 QG, and 2021 UA1.
^ abCite error: The named reference MPC-object was invoked but never defined (see the help page).
^Cite error: The named reference MPEC-2023-B72 was invoked but never defined (see the help page).
^ abcdCite error: The named reference jpldata was invoked but never defined (see the help page).
^Cite error: The named reference Perihelion was invoked but never defined (see the help page).
^ abCite error: The named reference JPL12 was invoked but never defined (see the help page).
^Northolt Branch Observatory: 77 seconds with an amplitude of 0.9 mag
^Cite error: The named reference NASA20230125 was invoked but never defined (see the help page).
2023BU is a near-Earth object that passed 9,967 ± 1 km (6,193.21 ± 0.62 mi) from the centerpoint of Earth around 27 January 2023 00:29 UT. Since Earth's...
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