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Centaur

2015 HR378

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(2015 HR378)

Where is it now

Distance from Sun
7.097 AU
True anomaly
226.75°
Distance from Earth
6.92 AU
As of
11 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.998 AU from the Sun Earth 2015 HR378 — 7.097 AU from the Sun 2015 HR378
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 HR378 is 6.92 AU from Earth today (57.6 light-minutes).

In the sky

Right ascension
06h 49m 08s
Declination
+12° 49′ 12″
Constellation
Gemini
Distance from Earth
6.91 AU
Elongation from the Sun
96.85° — 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
6.15 AU
Eccentricity
0.348
Inclination
10.28°
Orbital period
15.25 years
Perihelion
4.01 AU
Aphelion
8.29 AU
Longitude of ascending node
201.16°
Argument of periapsis
26.33°
Epoch · J2000
2457132.5
Orbit class · CEN
Centaur
Earth MOID · 1,169.3 LD
3.0046 AU
Tisserand (Jupiter)
2.852

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
23
Data arc
4 days
First observed
18 April 2015
Last observed
22 April 2015
Residual RMS
0.05 ″
Solution · Otto Matic
10 May 2024

Visual & observation

Absolute magnitude (H)
17.5

Discovery & classification

Centaur

Sources