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Asteroid Near-Earth

2021 TR3

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(2021 TR3)

Where is it now

Distance from Sun
0.736 AU
True anomaly
306.04°
Distance from Earth
1.534 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 2021 TR3 — 0.736 AU from the Sun 2021 TR3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 TR3 is 1.534 AU from Earth today (12.8 light-minutes).

In the sky

Right ascension
12h 25m 57s
Declination
+03° 52′ 37″
Constellation
Virgo
Distance from Earth
1.53 AU
Elongation from the Sun
23.26° — near the Sun — look low at dusk or dawn

Visible from both hemispheres.

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
0.849 AU
Eccentricity
0.1902
Inclination
19.71°
Orbital period
285.7 days
Perihelion
0.687 AU
Aphelion
1.01 AU
Longitude of ascending node
12.07°
Argument of periapsis
191.57°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.9 LD
0.0048 AU
Tisserand (Jupiter)
6.876

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
72
Data arc
24 hours
First observed
5 October 2021
Last observed
6 October 2021
Residual RMS
0.36 ″
Solution · Otto Matic
6 October 2021

Visual & observation

Absolute magnitude (H)
25.43

Discovery & classification

Aten Near-Earth Object

Close approaches 78 on record

Flyby geometry
Ecliptic flyby of 2021 TR3 at 2028-10-03 12:16 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-10-03 12:16 UTC close approach of 2021 TR3. Catalogue miss distance 83.0 LD · 3.19 × 10⁷ km. The curve is the geocentric path from 2028-09-30 to 2028-10-06, 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 83.0 LD · 3.19 × 10⁷ km 2028-10-03 12:16 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-10-03 12:16 UTC close approach of 2021 TR3. Catalogue miss distance 83.0 LD · 3.19 × 10⁷ km. The curve is the geocentric path from 2028-09-30 to 2028-10-06, 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
2028-10-03 12:16:00 Earth 0.2133 AU 83.0 LD 13.5 km/s
2029-03-01 01:19:00 Earth 0.3121 AU 121.5 LD 13.7 km/s
2030-10-04 01:29:00 Venus 0.027 AU 10.5 LD 12.8 km/s
2032-06-07 11:57:00 Earth 0.388 AU 151.0 LD 10.6 km/s
2032-10-14 04:50:00 Earth 0.2871 AU 111.7 LD 12.9 km/s
2035-10-07 16:34:00 Earth 0.4251 AU 165.4 LD 19 km/s
2036-03-27 17:04:00 Earth 0.3069 AU 119.5 LD 14.8 km/s
2039-05-08 18:31:00 Venus 0.1101 AU 42.8 LD 14.6 km/s
2039-10-08 06:27:00 Earth 0.0926 AU 36.0 LD 10.2 km/s
2043-04-20 21:25:00 Earth 0.3304 AU 128.6 LD 14.8 km/s

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

Sources