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Trans-Neptunian object

2003 BG91

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(2003 BG91)

Where is it now

Distance from Sun
39.188 AU
True anomaly
348.68°
Distance from Earth
39.938 AU
As of
19 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 BG91 — 39.188 AU from the Sun 2003 BG91
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2003 BG91 is 39.938 AU from Earth today (5.5 light-hours).

In the sky

Right ascension
16h 22m 22s
Declination
-19° 13′ 44″
Constellation
Scorpius
Distance from Earth
39.95 AU
Elongation from the Sun
39.8° — 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
43.437 AU
Eccentricity
0.0994
Inclination
2.45°
Orbital period
286.3 years
Perihelion
39.119 AU
Aphelion
47.754 AU
Longitude of ascending node
175.91°
Argument of periapsis
83.37°
Epoch · J2000
2452703.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,829.1 LD
38.1043 AU
Tisserand (Jupiter)
5.864

Orbit quality

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

Observations used
13
Data arc
92 days
First observed
27 January 2003
Last observed
29 April 2003
Residual RMS
0.02 ″
Solution · Otto Matic
14 April 2021

Physical properties

Rotation period
8.4 hours

Visual & observation

Absolute magnitude (H)
10.71

Discovery & classification

TNO

Sources