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Asteroid Near-Earth

2011 CF66

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(2011 CF66)

2011 CF66 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.7 AU to 1.33 AU from the Sun; one orbit takes 375.3 days. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
0.802 AU
True anomaly
61.88°
Distance from Earth
1.224 AU
As of
3 November 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 — 0.992 AU from the Sun Earth 2011 CF66 — 0.802 AU from the Sun 2011 CF66
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2011 CF66 is 1.224 AU from Earth today (10.2 light-minutes).

In the sky

Right ascension
17h 28m 31s
Declination
-23° 29′ 36″
Constellation
Ophiuchus
Distance from Earth
1.22 AU
Elongation from the Sun
40.96° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
1.018 AU
Eccentricity
0.3109
Inclination
0.96°
Orbital period
375.3 days
Perihelion
0.702 AU
Aphelion
1.335 AU
Longitude of ascending node
340.19°
Argument of periapsis
273.89°
Epoch · J2000
2455605.5
Orbit class · APO
Apollo
Earth MOID · 1.0 LD
0.0026 AU
Tisserand (Jupiter)
5.951

Orbit quality

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

Observations used
11
First observed
13 February 2011
Last observed
13 February 2011
Residual RMS
0.58 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
27.27

Discovery & classification

Apollo Near-Earth Object

Sources