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Trans-Neptunian object

2015 RS277

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(2015 RS277)

Where is it now

Distance from Sun
39.376 AU
True anomaly
99.77°
Distance from Earth
38.38 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 RS277 — 39.376 AU from the Sun 2015 RS277
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 RS277 is 38.38 AU from Earth today (5.3 light-hours).

In the sky

Right ascension
01h 33m 10s
Declination
+09° 37′ 41″
Constellation
Pisces
Distance from Earth
38.38 AU
Elongation from the Sun
179.06° — near opposition — up most of the night

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
39.472 AU
Eccentricity
0.1826
Inclination
3.92°
Orbital period
248 years
Perihelion
32.265 AU
Aphelion
46.679 AU
Longitude of ascending node
203.75°
Argument of periapsis
81.56°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,161.8 LD
31.2503 AU
Tisserand (Jupiter)
5.535

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
23
Data arc
857 days
First observed
19 July 2015
Last observed
22 November 2017
Residual RMS
0.19 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
9.1

Discovery & classification

TNO

Sources