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Trans-Neptunian object

2005 BW49

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(2005 BW49)

Where is it now

Distance from Sun
40.949 AU
True anomaly
336.18°
Distance from Earth
41.541 AU
As of
21 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 — 0.995 AU from the Sun Earth 2005 BW49 — 40.949 AU from the Sun 2005 BW49
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2005 BW49 is 41.541 AU from Earth today (5.8 light-hours).

In the sky

Right ascension
10h 31m 55s
Declination
+11° 27′ 13″
Constellation
Leo
Distance from Earth
41.53 AU
Elongation from the Sun
53.44° — 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
44.313 AU
Eccentricity
0.0819
Inclination
2.1°
Orbital period
295 years
Perihelion
40.685 AU
Aphelion
47.941 AU
Longitude of ascending node
58.93°
Argument of periapsis
119.16°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,446.4 LD
39.6905 AU
Tisserand (Jupiter)
5.93

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
33
Data arc
18.85 years
First observed
18 March 2004
Last observed
22 January 2023
Residual RMS
0.3 ″
Solution · Otto Matic
6 March 2025

Visual & observation

Absolute magnitude (H)
6.58

Discovery & classification

TNO

Sources