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Asteroid Near-Earth

2021 CR9

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(2021 CR9)

Where is it now

Distance from Sun
0.761 AU
True anomaly
305°
Distance from Earth
1.317 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 2021 CR9 — 0.761 AU from the Sun 2021 CR9
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 CR9 is 1.317 AU from Earth today (11.0 light-minutes).

In the sky

Right ascension
16h 03m 16s
Declination
-24° 45′ 54″
Constellation
Scorpius
Distance from Earth
1.31 AU
Elongation from the Sun
35.09° — 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
0.916 AU
Eccentricity
0.2366
Inclination
10.7°
Orbital period
320 days
Perihelion
0.699 AU
Aphelion
1.132 AU
Longitude of ascending node
332.17°
Argument of periapsis
14.36°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 42.2 LD
0.1084 AU
Tisserand (Jupiter)
6.484

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
39
Data arc
28 days
First observed
12 February 2021
Last observed
12 March 2021
Residual RMS
0.39 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
24.9

Discovery & classification

Aten Near-Earth Object

Close approaches 86 on record

Flyby geometry
Ecliptic flyby of 2021 CR9 at 2028-02-11 06:08 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-02-11 06:08 UTC close approach of 2021 CR9. Catalogue miss distance 47.6 LD · 1.83 × 10⁷ km. The curve is the geocentric path from 2028-02-08 to 2028-02-14, 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 47.6 LD · 1.83 × 10⁷ km 2028-02-11 06:08 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-02-11 06:08 UTC close approach of 2021 CR9. Catalogue miss distance 47.6 LD · 1.83 × 10⁷ km. The curve is the geocentric path from 2028-02-08 to 2028-02-14, 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
2028-02-11 06:08:00 Earth 0.1224 AU 47.6 LD 7.4 km/s
2028-07-28 10:39:00 Earth 0.291 AU 113.3 LD 10.5 km/s
2029-04-17 06:46:00 Earth 0.4046 AU 157.4 LD 18 km/s
2035-02-04 05:18:00 Earth 0.1138 AU 44.3 LD 7.5 km/s
2035-08-04 20:43:00 Earth 0.2962 AU 115.3 LD 11 km/s
2036-04-18 11:06:00 Earth 0.3661 AU 142.5 LD 16.7 km/s
2040-12-02 16:51:00 Venus 0.1478 AU 57.5 LD 9.8 km/s
2042-01-28 10:50:00 Earth 0.1087 AU 42.3 LD 7.7 km/s
2042-08-11 08:27:00 Earth 0.3004 AU 116.9 LD 11.3 km/s
2043-04-20 17:58:00 Earth 0.3255 AU 126.7 LD 15.2 km/s

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

Sources