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Asteroid Near-Earth

2010 EG21

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(2010 EG21)

Where is it now

Distance from Sun
0.725 AU
True anomaly
297.36°
Distance from Earth
1.268 AU
As of
19 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 — 0.996 AU from the Sun Earth 2010 EG21 — 0.725 AU from the Sun 2010 EG21
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2010 EG21 is 1.268 AU from Earth today (10.5 light-minutes).

In the sky

Right ascension
16h 00m 45s
Declination
-15° 57′ 47″
Constellation
Libra
Distance from Earth
1.26 AU
Elongation from the Sun
34.84° — 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
0.844 AU
Eccentricity
0.2265
Inclination
9.71°
Orbital period
283.2 days
Perihelion
0.653 AU
Aphelion
1.035 AU
Longitude of ascending node
168.52°
Argument of periapsis
186.45°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 15.6 LD
0.0401 AU
Tisserand (Jupiter)
6.939

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
50
Data arc
14 days
First observed
9 March 2010
Last observed
23 March 2010
Residual RMS
0.41 ″
Solution · Otto Matic
15 April 2021

Physical properties

Mean radius
0.05 km

Visual & observation

Geometric albedo
0.038
Absolute magnitude (H)
24.5

Discovery & classification

Aten Near-Earth Object

Close approaches 35 on record

Flyby geometry
Ecliptic flyby of 2010 EG21 at 2027-02-16 06:21 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-02-16 06:21 UTC close approach of 2010 EG21. Catalogue miss distance 129.9 LD · 4.99 × 10⁷ km. The curve is the geocentric path from 2027-02-13 to 2027-02-19, 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. At closest approach the object is south of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 129.9 LD · 4.99 × 10⁷ km 2027-02-16 06:21 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-02-16 06:21 UTC close approach of 2010 EG21. Catalogue miss distance 129.9 LD · 4.99 × 10⁷ km. The curve is the geocentric path from 2027-02-13 to 2027-02-19, 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. At closest approach the object is south of the ecliptic. 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
2027-02-16 06:21:00 Earth 0.3338 AU 129.9 LD 15.6 km/s
2031-04-09 11:49:00 Earth 0.2461 AU 95.8 LD 12.3 km/s
2034-02-13 11:31:00 Earth 0.2093 AU 81.4 LD 11.5 km/s
2038-04-07 10:47:00 Earth 0.3571 AU 139.0 LD 16.1 km/s
2041-02-15 15:12:00 Earth 0.1102 AU 42.9 LD 8.3 km/s
2045-04-04 02:53:00 Earth 0.4583 AU 178.3 LD 19.4 km/s
2065-02-18 08:51:00 Earth 0.422 AU 164.2 LD 18.4 km/s
2069-04-07 23:23:00 Earth 0.1622 AU 63.1 LD 9.5 km/s
2072-02-15 11:07:00 Earth 0.3044 AU 118.5 LD 14.6 km/s
2076-04-08 15:05:00 Earth 0.2672 AU 104.0 LD 13 km/s

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

Sources