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Comet

MASTER

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C/2015 K1 (MASTER)

MASTER is a comet in the Comet orbit class. Its orbit takes it from 2.56 AU to 358.59 AU from the Sun; one orbit takes 2,426.5 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
26.69 AU
True anomaly
145.22°
Distance from Earth
25.98 AU
As of
24 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 — 0.994 AU from the Sun Earth MASTER — 26.69 AU from the Sun MASTER
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. MASTER is 25.98 AU from Earth today (3.6 light-hours).

In the sky

Right ascension
04h 04m 13s
Declination
+48° 37′ 50″
Constellation
Perseus
Distance from Earth
25.98 AU
Elongation from the Sun
135.41° — 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 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
180.572 AU
Eccentricity
0.9858
Inclination
29.38°
Orbital period
2,426.5 years
Perihelion
2.557 AU
Aphelion
358.587 AU
Longitude of ascending node
5.18°
Argument of periapsis
280.2°
Epoch · J2000
2457264.5
Orbit class · COM
Comet
Earth MOID · 675.3 LD
1.7353 AU
Tisserand (Jupiter)
1.751

Orbit quality

Observations used
584
Data arc
258 days
First observed
17 May 2015
Last observed
30 January 2016
Residual RMS
0.53 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
11.1
Total magnitude M₁ · K₁ 5.5
11.1

Discovery & classification

Also known as 2015 K1

Named

Sources