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Trans-Neptunian object

2015 FG399

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(2015 FG399)

Where is it now

Distance from Sun
34.835 AU
True anomaly
309.43°
Distance from Earth
35.83 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 2015 FG399 — 34.835 AU from the Sun 2015 FG399
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 FG399 is 35.83 AU from Earth today (5.0 light-hours).

In the sky

Right ascension
13h 17m 46s
Declination
-05° 35′ 42″
Constellation
Virgo
Distance from Earth
35.83 AU
Elongation from the Sun
3.97° — too close to the Sun to observe

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
37.36 AU
Eccentricity
0.0979
Inclination
8.04°
Orbital period
228.4 years
Perihelion
33.701 AU
Aphelion
41.019 AU
Longitude of ascending node
182°
Argument of periapsis
68.7°
Epoch · J2000
2457122.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,724.3 LD
32.6957 AU
Tisserand (Jupiter)
5.42

Orbit quality

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

Observations used
22
Data arc
66 days
First observed
18 March 2015
Last observed
23 May 2015
Residual RMS
0.1 ″
Solution · Otto Matic
6 March 2025

Visual & observation

Absolute magnitude (H)
9.04

Discovery & classification

TNO

Sources