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Trans-Neptunian object

126154

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126154 (2001 YH140)

Where is it now

Distance from Sun
37.777 AU
True anomaly
44.59°
Distance from Earth
38.332 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 126154 — 37.777 AU from the Sun 126154
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 126154 is 38.332 AU from Earth today (5.3 light-hours).

In the sky

Right ascension
10h 19m 33s
Declination
+18° 01′ 15″
Constellation
Leo
Distance from Earth
38.32 AU
Elongation from the Sun
56.17° — near the Sun — look low at dusk or dawn

Favours the northern hemisphere; low or below the horizon from far south.

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
42.583 AU
Eccentricity
0.1453
Inclination
11.06°
Orbital period
277.9 years
Perihelion
36.397 AU
Aphelion
48.769 AU
Longitude of ascending node
108.77°
Argument of periapsis
356.09°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,782.2 LD
35.414 AU
Tisserand (Jupiter)
5.678

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
608
Data arc
24.16 years
First observed
18 December 2001
Last observed
14 February 2026
Residual RMS
0.5 ″
Solution · Otto Matic
6 June 2026

Physical properties

Rotation period
13.25 hours

Visual & observation

Absolute magnitude (H)
5.54

Discovery & classification

Discovered by
Trujillo, C. A., Brown, M. E.
Discovery date
18 December 2001
Discovery site
Palomar

Also known as 2001 YH140

TNO

Sources