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Asteroid Near-Earth

2018 RH3

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(2018 RH3)

Where is it now

Distance from Sun
0.784 AU
True anomaly
298.86°
Distance from Earth
1.651 AU
As of
22 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 2018 RH3 — 0.784 AU from the Sun 2018 RH3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2018 RH3 is 1.651 AU from Earth today (13.7 light-minutes).

In the sky

Right ascension
12h 40m 17s
Declination
-04° 29′ 22″
Constellation
Virgo
Distance from Earth
1.65 AU
Elongation from the Sun
19.07° — 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
0.959 AU
Eccentricity
0.2733
Inclination
0.43°
Orbital period
343 days
Perihelion
0.697 AU
Aphelion
1.221 AU
Longitude of ascending node
302.43°
Argument of periapsis
283.98°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 0.4 LD
0.0009 AU
Tisserand (Jupiter)
6.252

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
81
Data arc
8 days
First observed
9 September 2018
Last observed
17 September 2018
Residual RMS
0.37 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
26.1

Discovery & classification

Listed by JPL impact monitoring; see the Sentry table for current probabilities.

Aten Near-Earth Object

Close approaches 68 on record

Flyby geometry
Ecliptic flyby of 2018 RH3 at 2032-09-23 01:09 UTC Top-down view of the ecliptic, Earth at the centre, for the 2032-09-23 01:09 UTC close approach of 2018 RH3. Catalogue miss distance 189.4 LD · 7.28 × 10⁷ km. The curve is the geocentric path from 2032-09-20 to 2032-09-26, 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. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 189.4 LD · 7.28 × 10⁷ km 2032-09-23 01:09 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2032-09-23 01:09 UTC close approach of 2018 RH3. Catalogue miss distance 189.4 LD · 7.28 × 10⁷ km. The curve is the geocentric path from 2032-09-20 to 2032-09-26, 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. 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
2032-09-23 01:09:00 Earth 0.4868 AU 189.4 LD 23.3 km/s
2033-09-08 12:26:00 Earth 0.1222 AU 47.6 LD 12 km/s
2034-07-14 20:49:00 Earth 0.2334 AU 90.8 LD 6.5 km/s
2034-10-10 20:43:00 Earth 0.1942 AU 75.6 LD 6.4 km/s
2035-05-13 14:10:00 Earth 0.3126 AU 121.7 LD 10.7 km/s
2035-12-08 00:35:00 Earth 0.202 AU 78.6 LD 6.6 km/s
2036-03-14 04:09:00 Earth 0.2427 AU 94.5 LD 7.3 km/s
2037-01-12 21:44:00 Earth 0.107 AU 41.6 LD 11.7 km/s
2037-12-28 22:39:00 Earth 0.4825 AU 187.8 LD 23.4 km/s
2039-12-29 09:42:00 Venus 0.0601 AU 23.4 LD 8.1 km/s

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

Sources