NASA / JPL ID: 3830859

Asteroid 2018 SL1 Close Approach

Not flagged as hazardousNASA/JPL page

Notable Pass

Asteroid 2018 SL1 is a near-Earth object catalogued by NASA under reference ID 3830859. Its estimated diameter is 16–36 m (average 26 m), inferred from brightness rather than measured directly. Its closest catalogued approach to Earth occurs on Sun, Sep 16, 2018, missing by 3,648,932 km — 9.49 lunar distances. NASA does not classify it as a potentially hazardous asteroid.

This score ranks how notable the asteroid approach is. It is not an impact prediction.

Closest approach

Approach date

2018-Sep-16 22:22

Miss distance (km)

3,648,932 km

Miss distance (LD)

9.49 LD

Miss distance (AU)

0.0244 AU

Relative velocity

8.8 km/s

Orbitfall Index

37/100

Size and brightness

Diameter range

16–36 m

Average diameter

26 m

Absolute magnitude

26.10

Related close approaches

Date	Orbiting	Miss (km)	Miss (LD)	Velocity (km/s)	Index
19/08/24Tue, Aug 19, 1924	Earth	69,451,820	180.60	16.9	20
09/02/25Mon, Feb 9, 1925	Earth	57,081,665	148.43	8.8	16
18/08/67Fri, Aug 18, 1967	Earth	73,666,038	191.55	17.6	21
12/02/68Mon, Feb 12, 1968	Earth	57,317,793	149.04	9.0	16
22/08/10Sun, Aug 22, 2010	Earth	62,108,200	161.50	15.7	20
04/09/14Thu, Sep 4, 2014	Earth	31,700,017	82.43	11.2	17
16/09/18Sun, Sep 16, 2018	Earth	3,648,932	9.49	8.8	37
26/09/22Mon, Sep 26, 2022	Earth	21,716,579	56.47	9.4	17
06/10/26Tue, Oct 6, 2026	Earth	46,951,512	122.09	12.2	18
01/10/73Sun, Oct 1, 2073	Earth	35,504,178	92.32	10.7	17
27/04/28Tue, Apr 27, 2128	Earth	66,258,023	172.29	8.6	16

Data source

All figures on this page come from NASA's Near Earth Object Web Service, maintained by the Center for Near-Earth Object Studies at JPL. The Orbitfall Index is calculated by Orbitfall from those values — see the methodology and the NASA asteroid tracker overview. For current passes, see asteroids passing Earth today.

Asteroid guide

Learn about close approaches

Asteroids passing Earth today

Today's catalogued close approaches, ranked.

Near-Earth objects today

What counts as a near-Earth object, and today's list.

Asteroid close approaches

What a close approach is and how it's measured.

NASA asteroid tracker

Where the data comes from and how often it updates.

Potentially hazardous asteroids

What NASA's PHA label does and doesn't mean.

Lunar distance explained

1 LD = 384,400 km — the yardstick for flybys.

Close approach explained

Why a close approach is a schedule, not a warning.

How NASA tracks asteroids

From first detection to orbit refinement.