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Asteroid Near-Earth

2011 HR4

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(2011 HR4)

Where is it now

Distance from Sun
0.921 AU
True anomaly
105.08°
Distance from Earth
1.606 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 2011 HR4 — 0.921 AU from the Sun 2011 HR4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2011 HR4 is 1.606 AU from Earth today (13.4 light-minutes).

In the sky

Right ascension
11h 57m 36s
Declination
+05° 18′ 47″
Constellation
Virgo
Distance from Earth
1.61 AU
Elongation from the Sun
31.69° — 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
0.914 AU
Eccentricity
0.2248
Inclination
8.13°
Orbital period
319 days
Perihelion
0.708 AU
Aphelion
1.119 AU
Longitude of ascending node
47.38°
Argument of periapsis
349.85°
Epoch · J2000
2455678.5
Orbit class · ATE
Aten
Earth MOID · 30.6 LD
0.0787 AU
Tisserand (Jupiter)
6.503

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
11
Data arc
24 hours
First observed
26 April 2011
Last observed
27 April 2011
Residual RMS
0.7 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
24.55

Discovery & classification

Aten Near-Earth Object

Close approaches 2 on record

Flyby geometry
Ecliptic flyby of 2011 HR4 at 2038-03-09 12:31 UTC Top-down view of the ecliptic, Earth at the centre, for the 2038-03-09 12:31 UTC close approach of 2011 HR4. Catalogue miss distance 113.3 LD · 4.36 × 10⁷ km. The curve is the geocentric path from 2038-03-06 to 2038-03-12, 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 north of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 113.3 LD · 4.36 × 10⁷ km 2038-03-09 12:31 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2038-03-09 12:31 UTC close approach of 2011 HR4. Catalogue miss distance 113.3 LD · 4.36 × 10⁷ km. The curve is the geocentric path from 2038-03-06 to 2038-03-12, 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 north 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
2038-03-09 12:31:00 Earth 0.2912 AU 113.3 LD 14 km/s

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

Sources