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Asteroid Near-Earth

2013 US1

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(2013 US1)

Where is it now

Distance from Sun
0.752 AU
True anomaly
299.38°
Distance from Earth
1.627 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 2013 US1 — 0.752 AU from the Sun 2013 US1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2013 US1 is 1.627 AU from Earth today (13.5 light-minutes).

In the sky

Right ascension
12h 34m 03s
Declination
-04° 23′ 02″
Constellation
Virgo
Distance from Earth
1.63 AU
Elongation from the Sun
18.31° — 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
0.891 AU
Eccentricity
0.2389
Inclination
2.12°
Orbital period
307.1 days
Perihelion
0.678 AU
Aphelion
1.104 AU
Longitude of ascending node
207.09°
Argument of periapsis
17.61°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 7.0 LD
0.0179 AU
Tisserand (Jupiter)
6.644

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
30
Data arc
10 days
First observed
23 October 2013
Last observed
2 November 2013
Residual RMS
0.43 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
25.6

Discovery & classification

Aten Near-Earth Object

Close approaches 52 on record

Flyby geometry
Ecliptic flyby of 2013 US1 at 2039-09-23 22:24 UTC Top-down view of the ecliptic, Earth at the centre, for the 2039-09-23 22:24 UTC close approach of 2013 US1. Catalogue miss distance 77.8 LD · 2.99 × 10⁷ km. The curve is the geocentric path from 2039-09-20 to 2039-09-26, 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 77.8 LD · 2.99 × 10⁷ km 2039-09-23 22:24 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2039-09-23 22:24 UTC close approach of 2013 US1. Catalogue miss distance 77.8 LD · 2.99 × 10⁷ km. The curve is the geocentric path from 2039-09-20 to 2039-09-26, 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
2027-08-29 16:04:00 Venus 0.1102 AU 42.9 LD 11 km/s
2039-09-23 22:24:00 Earth 0.1999 AU 77.8 LD 12.8 km/s
2040-04-29 19:28:00 Earth 0.3296 AU 128.3 LD 10.8 km/s
2040-12-19 15:14:00 Earth 0.3513 AU 136.7 LD 17.6 km/s
2044-10-01 23:51:00 Earth 0.4339 AU 168.9 LD 20.2 km/s
2045-06-02 09:41:00 Earth 0.3225 AU 125.5 LD 10.1 km/s
2045-12-28 04:43:00 Earth 0.1147 AU 44.6 LD 10 km/s
2046-03-27 20:25:00 Venus 0.0443 AU 17.2 LD 6.2 km/s
2050-07-08 06:27:00 Earth 0.2715 AU 105.7 LD 7.2 km/s
2060-09-20 16:31:00 Earth 0.1215 AU 47.3 LD 10.3 km/s

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

Sources