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Trans-Neptunian object

2003 HN57

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(2003 HN57)

Where is it now

Distance from Sun
41.863 AU
True anomaly
32.45°
Distance from Earth
42.787 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 2003 HN57 — 41.863 AU from the Sun 2003 HN57
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2003 HN57 is 42.787 AU from Earth today (5.9 light-hours).

In the sky

Right ascension
15h 09m 45s
Declination
-18° 11′ 49″
Constellation
Libra
Distance from Earth
42.79 AU
Elongation from the Sun
21.18° — 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
44.328 AU
Eccentricity
0.0646
Inclination
1.99°
Orbital period
295.1 years
Perihelion
41.467 AU
Aphelion
47.19 AU
Longitude of ascending node
36.52°
Argument of periapsis
161.54°
Epoch · J2000
2452770.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,748.1 LD
40.4655 AU
Tisserand (Jupiter)
5.939

Orbit quality

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

Observations used
7
Data arc
34 days
First observed
26 April 2003
Last observed
30 May 2003
Residual RMS
0.09 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
5.87

Discovery & classification

TNO

Sources