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Asteroid Near-Earth

2021 TQ3

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(2021 TQ3)

Where is it now

Distance from Sun
0.942 AU
True anomaly
215.14°
Distance from Earth
0.577 AU
As of
16 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 — 0.997 AU from the Sun Earth 2021 TQ3 — 0.942 AU from the Sun 2021 TQ3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 TQ3 is 0.577 AU from Earth today (4.8 light-minutes).

In the sky

Right ascension
09h 38m 26s
Declination
+29° 24′ 46″
Constellation
Leo
Distance from Earth
0.58 AU
Elongation from the Sun
67.44° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

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
0.787 AU
Eccentricity
0.2849
Inclination
12.45°
Orbital period
254.8 days
Perihelion
0.562 AU
Aphelion
1.011 AU
Longitude of ascending node
12.69°
Argument of periapsis
189.73°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.6 LD
0.0041 AU
Tisserand (Jupiter)
7.344

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
72
Data arc
3 days
First observed
4 October 2021
Last observed
7 October 2021
Residual RMS
0.31 ″
Solution · Otto Matic
9 October 2021

Physical properties

Rotation period
0.33 hours

Visual & observation

Absolute magnitude (H)
27.1

Discovery & classification

Aten Near-Earth Object

Close approaches 122 on record

Flyby geometry
Ecliptic flyby of 2021 TQ3 at 2028-10-23 09:59 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-10-23 09:59 UTC close approach of 2021 TQ3. Catalogue miss distance 42.4 LD · 1.63 × 10⁷ km. The curve is the geocentric path from 2028-10-20 to 2028-10-26, 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 north of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 42.4 LD · 1.63 × 10⁷ km 2028-10-23 09:59 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-10-23 09:59 UTC close approach of 2021 TQ3. Catalogue miss distance 42.4 LD · 1.63 × 10⁷ km. The curve is the geocentric path from 2028-10-20 to 2028-10-26, 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 north 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
2028-10-23 09:59:00 Earth 0.109 AU 42.4 LD 8.3 km/s
2030-10-01 03:42:00 Earth 0.356 AU 138.6 LD 17.7 km/s
2031-02-26 01:53:00 Earth 0.3992 AU 155.4 LD 13.9 km/s
2032-07-11 17:01:00 Venus 0.1127 AU 43.8 LD 11.3 km/s
2033-04-26 00:28:00 Earth 0.4452 AU 173.3 LD 16.9 km/s
2033-06-06 18:34:00 Venus 0.1264 AU 49.2 LD 11.8 km/s
2035-07-05 11:30:00 Earth 0.3799 AU 147.9 LD 7.5 km/s
2035-11-02 13:24:00 Earth 0.2366 AU 92.1 LD 12.1 km/s
2037-09-27 19:10:00 Earth 0.2013 AU 78.4 LD 12.8 km/s
2038-02-03 22:44:00 Earth 0.3655 AU 142.3 LD 10.4 km/s

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

Sources