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Asteroid Near-Earth

2004 RO111

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(2004 RO111)

Where is it now

Distance from Sun
0.94 AU
True anomaly
105.75°
Distance from Earth
1.914 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 2004 RO111 — 0.94 AU from the Sun 2004 RO111
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2004 RO111 is 1.914 AU from Earth today (15.9 light-minutes).

In the sky

Right ascension
14h 24m 52s
Declination
-13° 04′ 01″
Constellation
Libra
Distance from Earth
1.92 AU
Elongation from the Sun
8.19° — 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
0.961 AU
Eccentricity
0.3322
Inclination
5.4°
Orbital period
344 days
Perihelion
0.642 AU
Aphelion
1.28 AU
Longitude of ascending node
199.17°
Argument of periapsis
281.13°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 9.3 LD
0.0239 AU
Tisserand (Jupiter)
6.222

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
69
Data arc
15.99 years
First observed
12 September 2004
Last observed
10 September 2020
Residual RMS
0.59 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
23.3

Discovery & classification

Aten Near-Earth Object

Close approaches 199 on record

Flyby geometry
Ecliptic flyby of 2004 RO111 at 2033-05-31 02:51 UTC Top-down view of the ecliptic, Earth at the centre, for the 2033-05-31 02:51 UTC close approach of 2004 RO111. Catalogue miss distance 134.7 LD · 5.18 × 10⁷ km. The curve is the geocentric path from 2033-05-28 to 2033-06-03, 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 134.7 LD · 5.18 × 10⁷ km 2033-05-31 02:51 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2033-05-31 02:51 UTC close approach of 2004 RO111. Catalogue miss distance 134.7 LD · 5.18 × 10⁷ km. The curve is the geocentric path from 2033-05-28 to 2033-06-03, 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
2027-07-09 17:15:00 Venus 0.0968 AU 37.7 LD 7.3 km/s
2029-07-17 19:08:00 Venus 0.1042 AU 40.6 LD 14.1 km/s
2033-05-31 02:51:00 Earth 0.3461 AU 134.7 LD 19.9 km/s
2034-05-16 13:31:00 Earth 0.0582 AU 22.7 LD 9.6 km/s
2035-03-11 12:40:00 Earth 0.2944 AU 114.6 LD 9.7 km/s
2035-07-02 14:47:00 Earth 0.2663 AU 103.7 LD 7.4 km/s
2036-01-20 16:00:00 Earth 0.3498 AU 136.1 LD 12.7 km/s
2036-08-20 03:01:00 Earth 0.2502 AU 97.4 LD 7.4 km/s
2036-11-29 04:07:00 Earth 0.2855 AU 111.1 LD 8.9 km/s
2037-09-27 16:02:00 Earth 0.0371 AU 14.4 LD 10.6 km/s

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

Sources