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Asteroid Near-Earth

2021 JR1

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(2021 JR1)

Where is it now

Distance from Sun
0.683 AU
True anomaly
320.43°
Distance from Earth
0.432 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 2021 JR1 — 0.683 AU from the Sun 2021 JR1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 JR1 is 0.432 AU from Earth today (3.6 light-minutes).

In the sky

Right ascension
15h 12m 33s
Declination
-37° 48′ 30″
Constellation
Lupus
Distance from Earth
0.43 AU
Elongation from the Sun
33.6° — 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
0.893 AU
Eccentricity
0.2718
Inclination
15.55°
Orbital period
308 days
Perihelion
0.65 AU
Aphelion
1.135 AU
Longitude of ascending node
60.54°
Argument of periapsis
348.18°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 40.5 LD
0.104 AU
Tisserand (Jupiter)
6.598

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
52
Data arc
37 days
First observed
4 May 2021
Last observed
10 June 2021
Residual RMS
0.54 ″
Solution · Otto Matic
15 June 2021

Visual & observation

Absolute magnitude (H)
23.36

Discovery & classification

Aten Near-Earth Object

Close approaches 180 on record

Flyby geometry
Ecliptic flyby of 2021 JR1 at 2026-11-06 18:44 UTC Top-down view of the ecliptic, Earth at the centre, for the 2026-11-06 18:44 UTC close approach of 2021 JR1. Catalogue miss distance 135.0 LD · 5.19 × 10⁷ km. The curve is the geocentric path from 2026-11-03 to 2026-11-09, 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 135.0 LD · 5.19 × 10⁷ km 2026-11-06 18:44 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2026-11-06 18:44 UTC close approach of 2021 JR1. Catalogue miss distance 135.0 LD · 5.19 × 10⁷ km. The curve is the geocentric path from 2026-11-03 to 2026-11-09, 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
2026-11-06 18:44:00 Earth 0.3468 AU 135.0 LD 14.9 km/s
2026-11-18 11:55:00 Venus 0.072 AU 28.0 LD 10.7 km/s
2027-06-13 04:55:00 Earth 0.2816 AU 109.6 LD 15.3 km/s
2031-12-21 08:53:00 Earth 0.3169 AU 123.3 LD 13.3 km/s
2032-05-29 08:48:00 Earth 0.1058 AU 41.2 LD 9.2 km/s
2033-07-30 13:31:00 Venus 0.0983 AU 38.2 LD 10.6 km/s
2037-04-17 10:15:00 Earth 0.2062 AU 80.2 LD 9.4 km/s
2037-10-08 07:34:00 Earth 0.3613 AU 140.6 LD 13.1 km/s
2038-06-07 12:12:00 Earth 0.4848 AU 188.7 LD 21.7 km/s
2042-04-03 05:09:00 Earth 0.4147 AU 161.4 LD 17.5 km/s

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

Sources