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Asteroid Near-Earth

2021 WG

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(2021 WG)

Where is it now

Distance from Sun
0.517 AU
True anomaly
22.43°
Distance from Earth
1.38 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 WG — 0.517 AU from the Sun 2021 WG
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 WG is 1.38 AU from Earth today (11.5 light-minutes).

In the sky

Right ascension
14h 33m 20s
Declination
-14° 44′ 12″
Constellation
Libra
Distance from Earth
1.38 AU
Elongation from the Sun
17.12° — too close to the Sun to observe

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
0.753 AU
Eccentricity
0.327
Inclination
3.31°
Orbital period
238.8 days
Perihelion
0.507 AU
Aphelion
1 AU
Longitude of ascending node
241.31°
Argument of periapsis
351°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.3 LD
0.0034 AU
Tisserand (Jupiter)
7.626

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
57
Data arc
24 hours
First observed
23 November 2021
Last observed
24 November 2021
Residual RMS
0.32 ″
Solution · Otto Matic
30 November 2021

Visual & observation

Absolute magnitude (H)
28.77

Discovery & classification

Aten Near-Earth Object

Close approaches 218 on record

Flyby geometry
Ecliptic flyby of 2021 WG at 2027-06-18 00:00 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-06-18 00:00 UTC close approach of 2021 WG. Catalogue miss distance 188.8 LD · 7.26 × 10⁷ km. The curve is the geocentric path from 2027-06-15 to 2027-06-21, 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 188.8 LD · 7.26 × 10⁷ km 2027-06-18 00:00 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-06-18 00:00 UTC close approach of 2021 WG. Catalogue miss distance 188.8 LD · 7.26 × 10⁷ km. The curve is the geocentric path from 2027-06-15 to 2027-06-21, 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
2027-06-18 00:00:00 Earth 0.4852 AU 188.8 LD 16.9 km/s
2031-05-03 03:53:00 Earth 0.4991 AU 194.2 LD 18.6 km/s
2033-04-09 06:05:00 Earth 0.4732 AU 184.1 LD 16.5 km/s
2034-10-29 05:16:00 Earth 0.3333 AU 129.7 LD 17.5 km/s
2035-03-14 16:08:00 Earth 0.4195 AU 163.3 LD 12.4 km/s
2036-10-24 05:41:00 Earth 0.1173 AU 45.6 LD 10 km/s
2038-11-25 06:31:00 Earth 0.005 AU 2.0 LD 6.1 km/s
2040-08-19 12:26:00 Earth 0.3386 AU 131.8 LD 5.6 km/s
2040-12-08 03:24:00 Earth 0.1473 AU 57.3 LD 11.1 km/s
2041-03-01 01:02:00 Mercury 0.0745 AU 29.0 LD 13.9 km/s

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

Sources