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Trans-Neptunian object

2017 BN239

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(2017 BN239)

2017 BN239 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 44.5 AU to 48.65 AU from the Sun; one orbit takes 317.9 years. Orbit from the JPL solution of 27 December 2024.

Where is it now

Distance from Sun
44.86 AU
True anomaly
324.18°
Distance from Earth
45.436 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 2017 BN239 — 44.86 AU from the Sun 2017 BN239
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 BN239 is 45.436 AU from Earth today (6.3 light-hours).

In the sky

Right ascension
10h 17m 20s
Declination
-07° 53′ 16″
Constellation
Sextans
Distance from Earth
45.43 AU
Elongation from the Sun
54.69° — 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
46.575 AU
Eccentricity
0.0446
Inclination
23.96°
Orbital period
317.9 years
Perihelion
44.498 AU
Aphelion
48.652 AU
Longitude of ascending node
293.03°
Argument of periapsis
263.51°
Epoch · J2000
2457768.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 16,961.8 LD
43.5844 AU
Tisserand (Jupiter)
5.574

Orbit quality

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

Observations used
17
Data arc
65 days
First observed
28 November 2016
Last observed
1 February 2017
Residual RMS
0.13 ″
Solution · Otto Matic
27 December 2024

Visual & observation

Absolute magnitude (H)
7.92

Discovery & classification

TNO

Sources