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Asteroid Near-Earth

2018 CH

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(2018 CH)

Where is it now

Distance from Sun
0.562 AU
True anomaly
56.71°
Distance from Earth
0.532 AU
As of
17 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 2018 CH — 0.562 AU from the Sun 2018 CH
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2018 CH is 0.532 AU from Earth today (4.4 light-minutes).

In the sky

Right ascension
11h 52m 54s
Declination
-00° 46′ 38″
Constellation
Virgo
Distance from Earth
0.54 AU
Elongation from the Sun
26.59° — 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
0.818 AU
Eccentricity
0.4011
Inclination
1.56°
Orbital period
270 days
Perihelion
0.49 AU
Aphelion
1.146 AU
Longitude of ascending node
109.92°
Argument of periapsis
241.41°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 3.7 LD
0.0094 AU
Tisserand (Jupiter)
7.09

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
36
Data arc
9 days
First observed
4 February 2018
Last observed
13 February 2018
Residual RMS
0.52 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
26.4

Discovery & classification

Aten Near-Earth Object

Close approaches 54 on record

Flyby geometry
Ecliptic flyby of 2018 CH at 2027-04-17 03:59 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-04-17 03:59 UTC close approach of 2018 CH. Catalogue miss distance 76.5 LD · 2.94 × 10⁷ km. The curve is the geocentric path from 2027-04-14 to 2027-04-20, 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 76.5 LD · 2.94 × 10⁷ km 2027-04-17 03:59 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-04-17 03:59 UTC close approach of 2018 CH. Catalogue miss distance 76.5 LD · 2.94 × 10⁷ km. The curve is the geocentric path from 2027-04-14 to 2027-04-20, 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
2026-10-07 04:24:00 Earth 0.4988 AU 194.1 LD 19.4 km/s
2027-04-17 03:59:00 Earth 0.1965 AU 76.5 LD 16.8 km/s
2029-02-14 02:44:00 Earth 0.4925 AU 191.7 LD 26.7 km/s
2030-04-07 11:41:00 Earth 0.4455 AU 173.4 LD 25.1 km/s
2032-02-04 14:11:00 Earth 0.2385 AU 92.8 LD 18.3 km/s
2035-01-31 10:38:00 Earth 0.0173 AU 6.7 LD 10.2 km/s
2035-07-21 05:17:00 Earth 0.4588 AU 178.5 LD 15.1 km/s
2037-12-10 13:30:00 Earth 0.3404 AU 132.5 LD 6.5 km/s
2038-03-12 08:03:00 Earth 0.1532 AU 59.6 LD 8.5 km/s
2040-10-28 12:45:00 Earth 0.4597 AU 178.9 LD 16.2 km/s

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

Sources