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Trans-Neptunian object

2015 HP198

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(2015 HP198)

2015 HP198 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 33.17 AU to 62.24 AU from the Sun; one orbit takes 329.5 years. Orbit from the JPL solution of 5 June 2024.

Where is it now

Distance from Sun
33.423 AU
True anomaly
345.46°
Distance from Earth
34.353 AU
As of
25 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 — 0.994 AU from the Sun Earth 2015 HP198 — 33.423 AU from the Sun 2015 HP198
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 HP198 is 34.353 AU from Earth today (4.8 light-hours).

In the sky

Right ascension
15h 24m 25s
Declination
-14° 33′ 07″
Constellation
Libra
Distance from Earth
34.35 AU
Elongation from the Sun
20.26° — near the Sun — look low at dusk or dawn

Visible from both hemispheres.

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
47.705 AU
Eccentricity
0.3046
Inclination
7.94°
Orbital period
329.5 years
Perihelion
33.174 AU
Aphelion
62.236 AU
Longitude of ascending node
202.32°
Argument of periapsis
45.5°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,517.8 LD
32.1652 AU
Tisserand (Jupiter)
5.822

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
70
Data arc
17.13 years
First observed
20 March 2004
Last observed
8 May 2021
Residual RMS
0.12 ″
Solution · Otto Matic
5 June 2024

Visual & observation

Absolute magnitude (H)
7.94

Discovery & classification

Also known as 2019 GW183

TNO

Sources