Skip to content
Public Universe
Asteroid Near-Earth

2011 FK1

Add to an observing list or journal →

(2011 FK1)

Where is it now

Distance from Sun
0.851 AU
True anomaly
81.32°
Distance from Earth
0.418 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 FK1 — 0.851 AU from the Sun 2011 FK1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2011 FK1 is 0.418 AU from Earth today (3.5 light-minutes).

In the sky

Right ascension
10h 55m 45s
Declination
+30° 06′ 56″
Constellation
Leo Minor
Distance from Earth
0.42 AU
Elongation from the Sun
58.42° — near the Sun — look low at dusk or dawn

Favours the northern hemisphere; low or below the horizon from far south.

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
0.926 AU
Eccentricity
0.2232
Inclination
13.07°
Orbital period
325.3 days
Perihelion
0.719 AU
Aphelion
1.132 AU
Longitude of ascending node
359.64°
Argument of periapsis
330.64°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 29.2 LD
0.0751 AU
Tisserand (Jupiter)
6.422

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
39
Data arc
19 days
First observed
16 March 2011
Last observed
4 April 2011
Residual RMS
0.63 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
23.7

Discovery & classification

Aten Near-Earth Object

Close approaches 37 on record

Flyby geometry
Ecliptic flyby of 2011 FK1 at 2052-04-03 16:24 UTC Top-down view of the ecliptic, Earth at the centre, for the 2052-04-03 16:24 UTC close approach of 2011 FK1. Catalogue miss distance 117.8 LD · 4.53 × 10⁷ km. The curve is the geocentric path from 2052-03-31 to 2052-04-06, 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 117.8 LD · 4.53 × 10⁷ km 2052-04-03 16:24 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2052-04-03 16:24 UTC close approach of 2011 FK1. Catalogue miss distance 117.8 LD · 4.53 × 10⁷ km. The curve is the geocentric path from 2052-03-31 to 2052-04-06, 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
2052-04-03 16:24:00 Earth 0.3026 AU 117.8 LD 16.3 km/s

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

Sources