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Asteroid Near-Earth

666241

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666241 (2010 BK2)

Where is it now

Distance from Sun
1.148 AU
True anomaly
214.29°
Distance from Earth
2.14 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 666241 — 1.148 AU from the Sun 666241
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 666241 is 2.14 AU from Earth today (17.8 light-minutes).

In the sky

Right ascension
13h 35m 10s
Declination
-13° 13′ 48″
Constellation
Virgo
Distance from Earth
2.14 AU
Elongation from the Sun
3.38° — 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
0.905 AU
Eccentricity
0.4479
Inclination
6.05°
Orbital period
314.2 days
Perihelion
0.499 AU
Aphelion
1.31 AU
Longitude of ascending node
278°
Argument of periapsis
72.69°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 12.8 LD
0.0329 AU
Tisserand (Jupiter)
6.494

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
85
Data arc
13.23 years
First observed
19 January 2010
Last observed
12 April 2023
Residual RMS
0.44 ″
Solution · Otto Matic
16 April 2024

Physical properties

Mean radius
0.06 km

Visual & observation

Geometric albedo
0.205
Absolute magnitude (H)
22.04

Discovery & classification

Discovered by
Siding Spring Survey
Discovery date
19 January 2010
Discovery site
Siding Spring

Also known as 2010 BK2

Aten Near-Earth Object

Close approaches 212 on record

Flyby geometry
Ecliptic flyby of 666241 at 2028-01-27 16:02 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-01-27 16:02 UTC close approach of 666241. Catalogue miss distance 119.7 LD · 4.6 × 10⁷ km. The curve is the geocentric path from 2028-01-24 to 2028-01-30, 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 119.7 LD · 4.6 × 10⁷ km 2028-01-27 16:02 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-01-27 16:02 UTC close approach of 666241. Catalogue miss distance 119.7 LD · 4.6 × 10⁷ km. The curve is the geocentric path from 2028-01-24 to 2028-01-30, 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
2027-10-27 03:32:00 Venus 0.0197 AU 7.7 LD 17 km/s
2028-01-27 16:02:00 Earth 0.3076 AU 119.7 LD 23.3 km/s
2028-10-29 06:34:00 Earth 0.4463 AU 173.7 LD 16 km/s
2029-03-03 20:07:00 Earth 0.3319 AU 129.2 LD 10.6 km/s
2029-08-04 15:57:00 Earth 0.477 AU 185.6 LD 18 km/s
2030-04-28 11:10:00 Earth 0.193 AU 75.1 LD 18.9 km/s
2030-08-04 23:05:00 Venus 0.0269 AU 10.5 LD 17.7 km/s
2032-02-14 06:16:00 Venus 0.0454 AU 17.7 LD 18.7 km/s
2034-02-01 16:57:00 Earth 0.4324 AU 168.3 LD 27.3 km/s
2034-11-15 21:38:00 Earth 0.3968 AU 154.4 LD 12.3 km/s

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

Sources