Skip to content
Public Universe
Asteroid Near-Earth

2021 QF

Add to an observing list or journal →

(2021 QF)

Where is it now

Distance from Sun
0.99 AU
True anomaly
217.73°
Distance from Earth
0.511 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 QF — 0.99 AU from the Sun 2021 QF
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 QF is 0.511 AU from Earth today (4.3 light-minutes).

In the sky

Right ascension
18h 32m 12s
Declination
-15° 58′ 57″
Constellation
Sagittarius
Distance from Earth
0.51 AU
Elongation from the Sun
73.89° — well clear of the Sun

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
0.806 AU
Eccentricity
0.3989
Inclination
8.64°
Orbital period
264.1 days
Perihelion
0.484 AU
Aphelion
1.127 AU
Longitude of ascending node
328.72°
Argument of periapsis
167.55°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 20.7 LD
0.0533 AU
Tisserand (Jupiter)
7.173

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
41
Data arc
23 days
First observed
17 August 2021
Last observed
9 September 2021
Residual RMS
0.4 ″
Solution · Otto Matic
12 September 2021

Visual & observation

Absolute magnitude (H)
24.12

Discovery & classification

Aten Near-Earth Object

Close approaches 102 on record

Flyby geometry
Ecliptic flyby of 2021 QF at 2026-12-08 04:00 UTC Top-down view of the ecliptic, Earth at the centre, for the 2026-12-08 04:00 UTC close approach of 2021 QF. Catalogue miss distance 166.9 LD · 6.42 × 10⁷ km. The curve is the geocentric path from 2026-12-05 to 2026-12-11, 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 166.9 LD · 6.42 × 10⁷ km 2026-12-08 04:00 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2026-12-08 04:00 UTC close approach of 2021 QF. Catalogue miss distance 166.9 LD · 6.42 × 10⁷ km. The curve is the geocentric path from 2026-12-05 to 2026-12-11, 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
2026-12-08 04:00:00 Earth 0.4288 AU 166.9 LD 13.2 km/s
2029-03-20 19:01:00 Earth 0.4693 AU 182.6 LD 17.4 km/s
2029-09-11 10:48:00 Earth 0.1835 AU 71.4 LD 15.1 km/s
2030-07-07 14:29:00 Venus 0.1311 AU 51.0 LD 15.4 km/s
2031-07-13 19:36:00 Earth 0.357 AU 138.9 LD 20.2 km/s
2032-01-17 02:14:00 Earth 0.4932 AU 192.0 LD 20.1 km/s
2034-08-21 02:54:00 Earth 0.1063 AU 41.4 LD 8.5 km/s
2035-10-14 03:48:00 Venus 0.1491 AU 58.0 LD 18.1 km/s
2037-02-19 23:14:00 Earth 0.499 AU 194.2 LD 20.8 km/s
2037-09-01 16:50:00 Earth 0.4514 AU 175.7 LD 23.9 km/s

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

Sources