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Trans-Neptunian object

2003 BF91

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(2003 BF91)

Where is it now

Distance from Sun
41.484 AU
True anomaly
322.65°
Distance from Earth
42.263 AU
As of
18 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 — 0.996 AU from the Sun Earth 2003 BF91 — 41.484 AU from the Sun 2003 BF91
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2003 BF91 is 42.263 AU from Earth today (5.9 light-hours).

In the sky

Right ascension
16h 06m 50s
Declination
-19° 49′ 55″
Constellation
Scorpius
Distance from Earth
42.27 AU
Elongation from the Sun
37.3° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
42.727 AU
Eccentricity
0.036
Inclination
1.49°
Orbital period
279.3 years
Perihelion
41.188 AU
Aphelion
44.267 AU
Longitude of ascending node
110.01°
Argument of periapsis
171.69°
Epoch · J2000
2452673.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,633.1 LD
40.17 AU
Tisserand (Jupiter)
5.847

Orbit quality

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

Observations used
10
Data arc
12 days
First observed
27 January 2003
Last observed
8 February 2003
Residual RMS
0 ″
Solution · Otto Matic
14 April 2021

Physical properties

Rotation period
18.2 hours

Visual & observation

Absolute magnitude (H)
11.72

Discovery & classification

TNO

Sources