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Trans-Neptunian object

2003 HF57

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(2003 HF57)

Where is it now

Distance from Sun
35.878 AU
True anomaly
74.16°
Distance from Earth
36.634 AU
As of
16 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 — 0.997 AU from the Sun Earth 2003 HF57 — 35.878 AU from the Sun 2003 HF57
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2003 HF57 is 36.634 AU from Earth today (5.1 light-hours).

In the sky

Right ascension
16h 05m 35s
Declination
-21° 14′ 20″
Constellation
Scorpius
Distance from Earth
36.64 AU
Elongation from the Sun
39.79° — 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
39.239 AU
Eccentricity
0.1934
Inclination
1.42°
Orbital period
245.8 years
Perihelion
31.651 AU
Aphelion
46.826 AU
Longitude of ascending node
48.12°
Argument of periapsis
122.24°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,931.4 LD
30.6584 AU
Tisserand (Jupiter)
5.519

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
49
Data arc
21.93 years
First observed
26 April 2003
Last observed
1 April 2025
Residual RMS
0.16 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
8.84

Discovery & classification

TNO

Sources