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Asteroid Near-Earth Potentially hazardous

2011 OB

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(2011 OB)

Where is it now

Distance from Sun
0.482 AU
True anomaly
313.24°
Distance from Earth
1.034 AU
As of
20 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 2011 OB — 0.482 AU from the Sun 2011 OB
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2011 OB is 1.034 AU from Earth today (8.6 light-minutes).

In the sky

Right ascension
12h 07m 06s
Declination
+00° 25′ 41″
Constellation
Virgo
Distance from Earth
1.05 AU
Elongation from the Sun
26.78° — 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
0.904 AU
Eccentricity
0.5241
Inclination
27.74°
Orbital period
313.9 days
Perihelion
0.43 AU
Aphelion
1.378 AU
Longitude of ascending node
106.22°
Argument of periapsis
48.91°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 4.0 LD
0.0103 AU
Tisserand (Jupiter)
6.384

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
89
Data arc
31.71 years
First observed
12 August 1993
Last observed
28 April 2025
Residual RMS
0.35 ″
Solution · Otto Matic
14 May 2025

Visual & observation

Absolute magnitude (H)
19.31

Discovery & classification

Aten Near-Earth Object Potentially Hazardous Asteroid

Close approaches 31 on record

Flyby geometry
Ecliptic flyby of 2011 OB at 2048-07-06 21:05 UTC Top-down view of the ecliptic, Earth at the centre, for the 2048-07-06 21:05 UTC close approach of 2011 OB. Catalogue miss distance 62.4 LD · 2.4 × 10⁷ km. The curve is the geocentric path from 2048-07-03 to 2048-07-09, 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 62.4 LD · 2.4 × 10⁷ km 2048-07-06 21:05 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2048-07-06 21:05 UTC close approach of 2011 OB. Catalogue miss distance 62.4 LD · 2.4 × 10⁷ km. The curve is the geocentric path from 2048-07-03 to 2048-07-09, 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
2048-07-06 21:05:00 Earth 0.1603 AU 62.4 LD 16.7 km/s
2054-07-07 22:50:00 Earth 0.0853 AU 33.2 LD 18.1 km/s
2060-07-08 21:28:00 Earth 0.0184 AU 7.2 LD 19.6 km/s
2066-07-10 14:06:00 Earth 0.0304 AU 11.8 LD 20.6 km/s
2072-07-12 07:16:00 Earth 0.0979 AU 38.1 LD 22.3 km/s
2078-07-15 12:44:00 Earth 0.1723 AU 67.0 LD 24.3 km/s
2115-07-08 20:29:00 Earth 0.1762 AU 68.6 LD 16.4 km/s
2121-07-08 15:40:00 Earth 0.1047 AU 40.8 LD 17.7 km/s
2127-07-10 07:34:00 Earth 0.041 AU 15.9 LD 19 km/s
2133-07-11 00:02:00 Earth 0.0149 AU 5.8 LD 20.1 km/s

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

Sources