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Solar
Trans-Neptunian object

2015 RW277

(2015 RW277)

Where is it now

Distance from Sun
30.385 AU
True anomaly
258.79°
Distance from Earth
29.462 AU
As of
2 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 — 1.001 AU from the Sun Earth 2015 RW277 — 30.385 AU from the Sun 2015 RW277
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 RW277 is 29.462 AU from Earth today (4.1 light-hours).

In the sky

Right ascension
01h 18m 30s
Declination
+24° 21′ 12″
Constellation
Pisces
Distance from Earth
29.46 AU
Elongation from the Sun
157.41° — well clear of the Sun

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

From your location

See how high it is right now, whether it's up after dark, 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
30.107 AU
Eccentricity
0.0781
Inclination
30.84°
Orbital period
165.2 years
Perihelion
27.756 AU
Aphelion
32.458 AU
Longitude of ascending node
1.34°
Argument of periapsis
130.24°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 10,447.5 LD
26.8453 AU
Tisserand (Jupiter)
4.291

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
25
Data arc
559 days
First observed
23 June 2015
Last observed
2 January 2017
Residual RMS
0.25 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
10.2

Discovery & classification

TNO

Sources