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Asteroid Near-Earth

2017 KR31

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(2017 KR31)

Where is it now

Distance from Sun
1.091 AU
True anomaly
179.67°
Distance from Earth
2.045 AU
As of
19 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 2017 KR31 — 1.091 AU from the Sun 2017 KR31
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 KR31 is 2.045 AU from Earth today (17.0 light-minutes).

In the sky

Right ascension
14h 24m 25s
Declination
-15° 34′ 17″
Constellation
Libra
Distance from Earth
2.05 AU
Elongation from the Sun
11.92° — too close to the Sun to observe

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
0.853 AU
Eccentricity
0.2784
Inclination
12.6°
Orbital period
288 days
Perihelion
0.616 AU
Aphelion
1.091 AU
Longitude of ascending node
239.61°
Argument of periapsis
169.7°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 25.3 LD
0.0649 AU
Tisserand (Jupiter)
6.856

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
72
Data arc
10 days
First observed
26 May 2017
Last observed
5 June 2017
Residual RMS
0.45 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
24.1

Discovery & classification

Aten Near-Earth Object

Close approaches 46 on record

Flyby geometry
Ecliptic flyby of 2017 KR31 at 2028-04-27 12:27 UTC Top-down view of the ecliptic, Earth at the centre, for the 2028-04-27 12:27 UTC close approach of 2017 KR31. Catalogue miss distance 49.2 LD · 1.89 × 10⁷ km. The curve is the geocentric path from 2028-04-24 to 2028-04-30, 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. At closest approach the object is south of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 49.2 LD · 1.89 × 10⁷ km 2028-04-27 12:27 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2028-04-27 12:27 UTC close approach of 2017 KR31. Catalogue miss distance 49.2 LD · 1.89 × 10⁷ km. The curve is the geocentric path from 2028-04-24 to 2028-04-30, 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. At closest approach the object is south 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
2028-04-27 12:27:00 Earth 0.1264 AU 49.2 LD 8.1 km/s
2031-02-13 15:49:00 Venus 0.1475 AU 57.4 LD 13 km/s
2031-12-28 03:59:00 Earth 0.3386 AU 131.8 LD 12.2 km/s
2032-06-07 13:01:00 Earth 0.1094 AU 42.6 LD 9.9 km/s
2035-11-15 00:31:00 Earth 0.3743 AU 145.7 LD 15 km/s
2036-06-04 07:43:00 Earth 0.4127 AU 160.6 LD 19.4 km/s
2039-04-08 12:38:00 Earth 0.2403 AU 93.5 LD 12 km/s
2047-06-09 23:51:00 Earth 0.2105 AU 81.9 LD 13 km/s
2050-04-12 04:24:00 Earth 0.4299 AU 167.3 LD 18.8 km/s
2062-06-07 21:55:00 Earth 0.3123 AU 121.5 LD 16.2 km/s

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

Sources