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Trans-Neptunian object

2015 FS345

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(2015 FS345)

2015 FS345 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 40.76 AU to 52.66 AU from the Sun; one orbit takes 319.2 years. Orbit from the JPL solution of 6 March 2025.

Where is it now

Distance from Sun
40.761 AU
True anomaly
0.23°
Distance from Earth
41.604 AU
As of
24 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 FS345 — 40.761 AU from the Sun 2015 FS345
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 FS345 is 41.604 AU from Earth today (5.8 light-hours).

In the sky

Right ascension
12h 04m 47s
Declination
+03° 09′ 38″
Constellation
Virgo
Distance from Earth
41.6 AU
Elongation from the Sun
32.44° — 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
46.708 AU
Eccentricity
0.1273
Inclination
3.49°
Orbital period
319.2 years
Perihelion
40.761 AU
Aphelion
52.655 AU
Longitude of ascending node
98.26°
Argument of periapsis
80.61°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,476.5 LD
39.7677 AU
Tisserand (Jupiter)
6.044

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
20
Data arc
9.94 years
First observed
17 March 2015
Last observed
23 February 2025
Residual RMS
0.21 ″
Solution · Otto Matic
6 March 2025

Visual & observation

Absolute magnitude (H)
7.04

Discovery & classification

TNO

Sources