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Asteroid Near-Earth

2019 YA4

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(2019 YA4)

Where is it now

Distance from Sun
0.708 AU
True anomaly
271.89°
Distance from Earth
1.647 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 2019 YA4 — 0.708 AU from the Sun 2019 YA4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2019 YA4 is 1.647 AU from Earth today (13.7 light-minutes).

In the sky

Right ascension
14h 37m 13s
Declination
-14° 15′ 05″
Constellation
Libra
Distance from Earth
1.64 AU
Elongation from the Sun
12.52° — 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
0.923 AU
Eccentricity
0.4704
Inclination
2.82°
Orbital period
323.9 days
Perihelion
0.489 AU
Aphelion
1.357 AU
Longitude of ascending node
119.7°
Argument of periapsis
206.64°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 8.9 LD
0.0229 AU
Tisserand (Jupiter)
6.38

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
165
Data arc
9.16 years
First observed
12 February 2013
Last observed
13 April 2022
Residual RMS
0.52 ″
Solution · Otto Matic
19 September 2026

Visual & observation

Absolute magnitude (H)
23.4

Discovery & classification

Aten Near-Earth Object

Close approaches 123 on record

Flyby geometry
Ecliptic flyby of 2019 YA4 at 2027-12-24 14:32 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-12-24 14:32 UTC close approach of 2019 YA4. Catalogue miss distance 48.1 LD · 1.85 × 10⁷ km. The curve is the geocentric path from 2027-12-21 to 2027-12-27, 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 48.1 LD · 1.85 × 10⁷ km 2027-12-24 14:32 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-12-24 14:32 UTC close approach of 2019 YA4. Catalogue miss distance 48.1 LD · 1.85 × 10⁷ km. The curve is the geocentric path from 2027-12-21 to 2027-12-27, 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
2027-12-24 14:32:00 Earth 0.1237 AU 48.1 LD 11.1 km/s
2030-04-07 16:35:00 Earth 0.0906 AU 35.3 LD 16.8 km/s
2030-07-13 14:26:00 Venus 0.0974 AU 37.9 LD 12.2 km/s
2040-02-04 15:54:00 Venus 0.0986 AU 38.4 LD 12.1 km/s
2044-08-06 17:38:00 Merc 0.0918 AU 35.7 LD 9.7 km/s
2044-08-06 17:38:00 Mercury 0.0918 AU 35.7 LD 9.7 km/s
2044-09-16 20:41:00 Venus 0.1145 AU 44.6 LD 22.3 km/s
2048-01-26 05:18:00 Venus 0.0606 AU 23.6 LD 19.6 km/s
2050-12-27 06:14:00 Earth 0.124 AU 48.2 LD 18.2 km/s
2052-09-08 13:46:00 Venus 0.0487 AU 19.0 LD 14.6 km/s

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

Sources