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Asteroid Near-Earth

2021 EL4

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(2021 EL4)

Where is it now

Distance from Sun
1.137 AU
True anomaly
207.4°
Distance from Earth
1.938 AU
As of
21 October 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Sun Earth — 0.995 AU from the Sun Earth 2021 EL4 — 1.137 AU from the Sun 2021 EL4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 EL4 is 1.938 AU from Earth today (16.1 light-minutes).

In the sky

Right ascension
15h 32m 09s
Declination
-18° 07′ 44″
Constellation
Libra
Distance from Earth
1.94 AU
Elongation from the Sun
26.4° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

From your location

See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.

Orbital elements

Semi-major axis
0.917 AU
Eccentricity
0.2987
Inclination
1.66°
Orbital period
320.9 days
Perihelion
0.643 AU
Aphelion
1.191 AU
Longitude of ascending node
180.17°
Argument of periapsis
230.21°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.5 LD
0.0038 AU
Tisserand (Jupiter)
6.473

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
156
Data arc
469 days
First observed
15 March 2021
Last observed
27 June 2022
Residual RMS
0.37 ″
Solution · Otto Matic
29 June 2022

Physical properties

Rotation period
0.14 hours

Visual & observation

Absolute magnitude (H)
25.78

Discovery & classification

Aten Near-Earth Object

Close approaches 203 on record

Flyby geometry
Ecliptic flyby of 2021 EL4 at 2028-03-17 07:42 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-03-17 07:42 UTC close approach of 2021 EL4. Catalogue miss distance 68.2 LD · 2.62 × 10⁷ km. The curve is the geocentric path from 2028-03-14 to 2028-03-20, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 68.2 LD · 2.62 × 10⁷ km 2028-03-17 07:42 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-03-17 07:42 UTC close approach of 2021 EL4. Catalogue miss distance 68.2 LD · 2.62 × 10⁷ km. The curve is the geocentric path from 2028-03-14 to 2028-03-20, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2028-03-17 07:42:00 Earth 0.1753 AU 68.2 LD 13.6 km/s
2028-11-28 02:50:00 Earth 0.3386 AU 131.8 LD 11.8 km/s
2029-06-22 22:25:00 Earth 0.1158 AU 45.1 LD 5.8 km/s
2032-06-21 17:11:00 Venus 0.0405 AU 15.7 LD 8.6 km/s
2035-03-26 01:56:00 Earth 0.3734 AU 145.3 LD 19.7 km/s
2035-12-28 07:23:00 Earth 0.2962 AU 115.3 LD 9.3 km/s
2036-05-12 03:24:00 Earth 0.1837 AU 71.5 LD 6.6 km/s
2036-09-13 21:01:00 Earth 0.2855 AU 111.1 LD 8.3 km/s
2037-06-23 01:19:00 Earth 0.3947 AU 153.6 LD 20.2 km/s
2038-08-19 13:11:00 Venus 0.0458 AU 17.8 LD 9.7 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources