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NEO Earth Close Approaches

Close Approach Data

The following table shows close approaches to the Earth by near-Earth objects (NEOs) limited as selected in the “Table Settings” below. Data are not available prior to 1900 A.D. nor after 2200 A.D. Data are further limited to encounters with reasonably low uncertainty.

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Table Column Descriptions  |  [[legendButtonText]]
Object primary designation
Close-Approach (CA) Date
Date and time (TDB) of closest Earth approach. "Nominal Date" is given to appropriate precision. The 3-sigma uncertainty in the time is given in the +/- column in days_hours:minutes format (for example, "2_15:23" is 2 days, 15 hours, 23 minutes; "< 00:01" is less than 1 minute).
View CA
Open the close-approach viewer and render the high-precision trajectory during the close approach.
CA Distance Nominal (au)
The most likely (Nominal) close-approach distance (Earth center to NEO center), in astronomical units.
CA Distance Minimum (au)
The minimum possible close-approach distance (Earth center to NEO center), in astronomical units. The minimum possible distance is based on the 3-sigma Earth target-plane error ellipse.
V relative (km/s)
Object velocity relative to Earth at close-approach.
V infinity (km/s)
Object velocity relative to a massless Earth at close-approach.
H (mag)
Asteroid absolute magnitude (in general, smaller H implies larger asteroid diameter). Undefined for comets.
Diameter value when known or a range (min - max) estimated using the asteroid's absolute magnitude (H) and limiting albedos of 0.25 and 0.05.
A measure of how infrequent the Earth close approach is for asteroids of the same size and larger: 0 means an average frequency of 100 per year, i.e., roughly every few days or less, 1 corresponds to roughly once a month, 2 to roughly once a year, 3 to roughly once a decade, etc. 'n/a' means that a frequency estimate is not available. See note for details.
One Astronomical Unit (au) is approximately 150 million kilometers (see glossary for definition).
One Lunar Distance (LD) is approximately 384,000 kilometers (see glossary for definition).