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Trans-Neptunian object

2015 BL641

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(2015 BL641)

Where is it now

Distance from Sun
44.055 AU
True anomaly
224.25°
Distance from Earth
44.643 AU
As of
16 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 — 0.997 AU from the Sun Earth 2015 BL641 — 44.055 AU from the Sun 2015 BL641
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 BL641 is 44.643 AU from Earth today (6.2 light-hours).

In the sky

Right ascension
09h 55m 56s
Declination
+00° 36′ 30″
Constellation
Sextans
Distance from Earth
44.64 AU
Elongation from the Sun
53.48° — 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
39.02 AU
Eccentricity
0.2188
Inclination
16.18°
Orbital period
243.7 years
Perihelion
30.484 AU
Aphelion
47.556 AU
Longitude of ascending node
193.93°
Argument of periapsis
90.51°
Epoch · J2000
2457043.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,483.4 LD
29.5073 AU
Tisserand (Jupiter)
5.266

Orbit quality

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

Observations used
9
Data arc
11 days
First observed
16 January 2015
Last observed
27 January 2015
Residual RMS
0.11 ″
Solution · Otto Matic
5 June 2026

Visual & observation

Absolute magnitude (H)
6.88

Discovery & classification

TNO

Sources