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Asteroid Near-Earth

2026 CO4

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(2026 CO4)

Where is it now

Distance from Sun
1.01 AU
True anomaly
135.72°
Distance from Earth
1.002 AU
As of
21 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 — 0.995 AU from the Sun Earth 2026 CO4 — 1.01 AU from the Sun 2026 CO4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2026 CO4 is 1.002 AU from Earth today (8.3 light-minutes).

In the sky

Right ascension
11h 41m 32s
Declination
+42° 33′ 25″
Constellation
Ursa Major
Distance from Earth
1 AU
Elongation from the Sun
60.85° — 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
0.92 AU
Eccentricity
0.1558
Inclination
38.86°
Orbital period
322.3 days
Perihelion
0.777 AU
Aphelion
1.063 AU
Longitude of ascending node
325.92°
Argument of periapsis
333.34°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 21.3 LD
0.0546 AU
Tisserand (Jupiter)
6.303

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
150
Data arc
7.12 years
First observed
17 January 2019
Last observed
2 March 2026
Residual RMS
0.39 ″
Solution · Otto Matic
9 March 2026

Visual & observation

Absolute magnitude (H)
20.62

Discovery & classification

Aten Near-Earth Object

Close approaches 57 on record

Flyby geometry
Ecliptic flyby of 2026 CO4 at 2034-02-13 06:51 UTC Top-down view of the ecliptic, Earth at the centre, for the 2034-02-13 06:51 UTC close approach of 2026 CO4. Catalogue miss distance 73.4 LD · 2.82 × 10⁷ km. The curve is the geocentric path from 2034-02-10 to 2034-02-16, 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 73.4 LD · 2.82 × 10⁷ km 2034-02-13 06:51 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2034-02-13 06:51 UTC close approach of 2026 CO4. Catalogue miss distance 73.4 LD · 2.82 × 10⁷ km. The curve is the geocentric path from 2034-02-10 to 2034-02-16, 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
2034-02-13 06:51:00 Earth 0.1885 AU 73.4 LD 20.9 km/s
2041-02-16 13:31:00 Earth 0.1485 AU 57.8 LD 19.3 km/s
2043-04-22 00:50:00 Venus 0.0566 AU 22.0 LD 24.4 km/s
2049-02-12 23:12:00 Earth 0.1955 AU 76.1 LD 21 km/s
2056-02-17 07:59:00 Earth 0.1462 AU 56.9 LD 19.3 km/s
2063-08-09 01:35:00 Venus 0.0681 AU 26.5 LD 24.3 km/s
2064-02-13 19:06:00 Earth 0.1948 AU 75.8 LD 21 km/s
2069-10-06 19:38:00 Venus 0.1378 AU 53.6 LD 25.4 km/s
2071-02-17 03:27:00 Earth 0.1423 AU 55.4 LD 19.3 km/s
2079-02-13 12:56:00 Earth 0.1984 AU 77.2 LD 21.1 km/s

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

Sources