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Trans-Neptunian object

2003 HJ57

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(2003 HJ57)

Where is it now

Distance from Sun
41.874 AU
True anomaly
116.48°
Distance from Earth
42.765 AU
As of
17 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 — 0.996 AU from the Sun Earth 2003 HJ57 — 41.874 AU from the Sun 2003 HJ57
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2003 HJ57 is 42.765 AU from Earth today (5.9 light-hours).

In the sky

Right ascension
14h 45m 35s
Declination
-28° 49′ 44″
Constellation
Hydra
Distance from Earth
42.77 AU
Elongation from the Sun
26.15° — 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
39.686 AU
Eccentricity
0.2501
Inclination
22.18°
Orbital period
250 years
Perihelion
29.761 AU
Aphelion
49.612 AU
Longitude of ascending node
15.34°
Argument of periapsis
98.52°
Epoch · J2000
2452756.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,227.7 LD
28.8502 AU
Tisserand (Jupiter)
5.083

Orbit quality

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

Observations used
4
Data arc
24 hours
First observed
26 April 2003
Last observed
27 April 2003
Residual RMS
0.11 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
8.29

Discovery & classification

TNO

Sources