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Trans-Neptunian object

1998 HN151

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(1998 HN151)

Where is it now

Distance from Sun
38.979 AU
True anomaly
234.56°
Distance from Earth
39.931 AU
As of
15 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 1998 HN151 — 38.979 AU from the Sun 1998 HN151
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 1998 HN151 is 39.931 AU from Earth today (5.5 light-hours).

In the sky

Right ascension
14h 26m 28s
Declination
-15° 41′ 33″
Constellation
Libra
Distance from Earth
39.94 AU
Elongation from the Sun
16.13° — too close to the Sun to observe

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
37.921 AU
Eccentricity
0.0512
Inclination
25°
Orbital period
233.5 years
Perihelion
35.979 AU
Aphelion
39.863 AU
Longitude of ascending node
37.3°
Argument of periapsis
308.18°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,632.2 LD
35.0286 AU
Tisserand (Jupiter)
5.024

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
31
Data arc
18.95 years
First observed
21 April 1998
Last observed
1 April 2017
Residual RMS
0.26 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
8.25

Discovery & classification

TNO

Sources