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Trans-Neptunian object

2017 FH252

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(2017 FH252)

2017 FH252 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 36.65 AU to 59.33 AU from the Sun; one orbit takes 332.4 years. Orbit from the JPL solution of 17 September 2025.

Where is it now

Distance from Sun
47.395 AU
True anomaly
259.26°
Distance from Earth
48.039 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 2017 FH252 — 47.395 AU from the Sun 2017 FH252
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 FH252 is 48.039 AU from Earth today (6.7 light-hours).

In the sky

Right ascension
10h 48m 00s
Declination
-00° 27′ 39″
Constellation
Sextans
Distance from Earth
48.03 AU
Elongation from the Sun
50.04° — 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
47.989 AU
Eccentricity
0.2364
Inclination
10.74°
Orbital period
332.4 years
Perihelion
36.646 AU
Aphelion
59.333 AU
Longitude of ascending node
207.25°
Argument of periapsis
55.64°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,871.1 LD
35.6426 AU
Tisserand (Jupiter)
5.907

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
118
Data arc
4.22 years
First observed
16 January 2015
Last observed
5 April 2019
Residual RMS
0.14 ″
Solution · Otto Matic
17 September 2025

Visual & observation

Absolute magnitude (H)
8.45

Discovery & classification

TNO

Sources