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Trans-Neptunian object

2004 HE79

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(2004 HE79)

Where is it now

Distance from Sun
40.569 AU
True anomaly
35.3°
Distance from Earth
41.206 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 2004 HE79 — 40.569 AU from the Sun 2004 HE79
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2004 HE79 is 41.206 AU from Earth today (5.7 light-hours).

In the sky

Right ascension
17h 07m 43s
Declination
-23° 45′ 11″
Constellation
Ophiuchus
Distance from Earth
41.21 AU
Elongation from the Sun
49.55° — near the Sun — look low at dusk or dawn

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
44.141 AU
Eccentricity
0.0957
Inclination
3.09°
Orbital period
293.3 years
Perihelion
39.918 AU
Aphelion
48.365 AU
Longitude of ascending node
62.83°
Argument of periapsis
161.01°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,142.5 LD
38.9096 AU
Tisserand (Jupiter)
5.908

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
22
Data arc
11.16 years
First observed
24 April 2004
Last observed
21 June 2015
Residual RMS
0.36 ″
Solution · Otto Matic
22 September 2025

Visual & observation

Absolute magnitude (H)
7.51

Discovery & classification

TNO

Sources