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NEO Earth Close Approaches

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Data Table
Comets (pre-1900)
Uncertainties

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 Settings:
Object Close-Approach (CA) Date CA Distance
Nominal (LD | au) 		CA Distance
Minimum (LD | au) 		V relative
(km/s) 		V infinity
(km/s) 		H
(mag) 		Diameter

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Table Column Descriptions  |  [[legendButtonText]]
Object
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).
CA Distance Nominal (LD | au)
The most likely (Nominal) close-approach distance (Earth center to NEO center), in LD (Lunar Distance) and au.
CA Distance Minimum (LD | au)
The minimum possible close-approach distance (Earth center to NEO center), in LD (Lunar Distance) and au. 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
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.
au
One Astronomical Unit (au) is approximately 150 million kilometers (see glossary for definition).
LD
One Lunar Distance (LD) is approximately 384,000 kilometers (see glossary for definition).