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Asteroid Near-Earth

2015 XT378

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(2015 XT378)

Where is it now

Distance from Sun
0.95 AU
True anomaly
106.81°
Distance from Earth
0.663 AU
As of
22 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 2015 XT378 — 0.95 AU from the Sun 2015 XT378
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 XT378 is 0.663 AU from Earth today (5.5 light-minutes).

In the sky

Right ascension
09h 42m 42s
Declination
+14° 57′ 08″
Constellation
Leo
Distance from Earth
0.66 AU
Elongation from the Sun
66.52° — well clear of the Sun

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
0.937 AU
Eccentricity
0.2336
Inclination
5.69°
Orbital period
331.4 days
Perihelion
0.718 AU
Aphelion
1.156 AU
Longitude of ascending node
257.26°
Argument of periapsis
64.97°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 0.3 LD
0.0007 AU
Tisserand (Jupiter)
6.374

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
12
Data arc
3 days
First observed
13 December 2015
Last observed
16 December 2015
Residual RMS
0.69 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
27.9

Discovery & classification

Aten Near-Earth Object

Close approaches 66 on record

Flyby geometry
Ecliptic flyby of 2015 XT378 at 2027-04-16 15:51 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-04-16 15:51 UTC close approach of 2015 XT378. Catalogue miss distance 33.9 LD · 1.3 × 10⁷ km. The curve is the geocentric path from 2027-04-13 to 2027-04-19, 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 33.9 LD · 1.3 × 10⁷ km 2027-04-16 15:51 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-04-16 15:51 UTC close approach of 2015 XT378. Catalogue miss distance 33.9 LD · 1.3 × 10⁷ km. The curve is the geocentric path from 2027-04-13 to 2027-04-19, 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
2027-04-16 15:51:00 Earth 0.087 AU 33.9 LD 8.6 km/s
2034-12-19 17:53:00 Earth 0.3127 AU 121.7 LD 17.1 km/s
2035-10-10 08:14:00 Earth 0.2443 AU 95.1 LD 6.5 km/s
2036-01-26 09:07:00 Earth 0.1839 AU 71.6 LD 6 km/s
2036-07-05 01:35:00 Earth 0.2723 AU 106.0 LD 8.7 km/s
2037-04-09 15:26:00 Earth 0.2079 AU 80.9 LD 13.2 km/s
2038-06-19 14:24:00 Venus 0.1175 AU 45.7 LD 7.1 km/s
2040-02-19 22:16:00 Venus 0.1177 AU 45.8 LD 12 km/s
2044-12-13 14:56:00 Earth 0.1628 AU 63.4 LD 12.5 km/s
2045-09-10 22:32:00 Earth 0.2896 AU 112.7 LD 8.8 km/s

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

Sources