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Asteroid Near-Earth

1999 AO10

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(1999 AO10)

Where is it now

Distance from Sun
0.954 AU
True anomaly
120.03°
Distance from Earth
0.842 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 1999 AO10 — 0.954 AU from the Sun 1999 AO10
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1999 AO10 is 0.842 AU from Earth today (7.0 light-minutes).

In the sky

Right ascension
09h 59m 09s
Declination
+14° 46′ 31″
Constellation
Leo
Distance from Earth
0.84 AU
Elongation from the Sun
61.91° — well clear of the Sun

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
0.912 AU
Eccentricity
0.1109
Inclination
2.58°
Orbital period
318.1 days
Perihelion
0.811 AU
Aphelion
1.013 AU
Longitude of ascending node
312.17°
Argument of periapsis
7.22°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 8.4 LD
0.0216 AU
Tisserand (Jupiter)
6.537

Orbit quality

Orbit very well determined (uncertainty code 1).

Observations used
230
Data arc
27.18 years
First observed
13 January 1999
Last observed
19 March 2026
Residual RMS
0.38 ″
Solution · Otto Matic
13 June 2026

Visual & observation

Absolute magnitude (H)
24.32

Discovery & classification

Aten Near-Earth Object

Close approaches 80 on record

Flyby geometry
Ecliptic flyby of 1999 AO10 at 2032-09-14 20:31 UTC Top-down view of the ecliptic, Earth at the centre, for the 2032-09-14 20:31 UTC close approach of 1999 AO10. Catalogue miss distance 72.3 LD · 2.78 × 10⁷ km. The curve is the geocentric path from 2032-09-11 to 2032-09-17, 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 72.3 LD · 2.78 × 10⁷ km 2032-09-14 20:31 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2032-09-14 20:31 UTC close approach of 1999 AO10. Catalogue miss distance 72.3 LD · 2.78 × 10⁷ km. The curve is the geocentric path from 2032-09-11 to 2032-09-17, 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
2029-02-14 14:02:00 Venus 0.0903 AU 35.1 LD 3.1 km/s
2032-09-14 20:31:00 Earth 0.1858 AU 72.3 LD 4.9 km/s
2033-03-17 04:55:00 Earth 0.1594 AU 62.0 LD 7.7 km/s
2039-08-14 05:03:00 Venus 0.1064 AU 41.4 LD 2.7 km/s
2045-12-26 12:41:00 Earth 0.0795 AU 31.0 LD 5.2 km/s
2046-06-06 14:32:00 Earth 0.1639 AU 63.8 LD 3.8 km/s
2050-02-10 10:30:00 Venus 0.1287 AU 50.1 LD 1.5 km/s
2053-02-19 22:19:00 Earth 0.0263 AU 10.2 LD 2.7 km/s
2059-09-17 09:30:00 Earth 0.1831 AU 71.2 LD 4.8 km/s
2060-03-16 09:37:00 Earth 0.147 AU 57.2 LD 7.3 km/s

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

Sources