Skip to content
Public Universe
Comet

Siverd

Add to an observing list or journal →

C/2025 K4 (Siverd)

Siverd is a comet in the Comet orbit class. Its orbit takes it from 2.53 AU to 84.14 AU from the Sun; one orbit takes 285.3 years. Orbit from the JPL solution of 12 December 2025.

Where is it now

Distance from Sun
5.026 AU
True anomaly
91.32°
Distance from Earth
4.473 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 Siverd — 5.026 AU from the Sun Siverd
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Siverd is 4.473 AU from Earth today (37.2 light-minutes).

In the sky

Right ascension
21h 41m 37s
Declination
+25° 11′ 19″
Constellation
Pegasus
Distance from Earth
4.48 AU
Elongation from the Sun
118.2° — 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
43.338 AU
Eccentricity
0.9416
Inclination
38.54°
Orbital period
285.3 years
Perihelion
2.532 AU
Aphelion
84.143 AU
Longitude of ascending node
297.08°
Argument of periapsis
326.94°
Epoch · J2000
2460842.5
Orbit class · COM
Comet
Earth MOID · 616.6 LD
1.5845 AU
Tisserand (Jupiter)
1.641

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
29
Data arc
111 days
First observed
30 May 2025
Last observed
18 September 2025
Residual RMS
0.46 ″
Solution · Otto Matic
12 December 2025

Visual & observation

Absolute magnitude (H)
13.8
Total magnitude M₁ · K₁ 10
13.8

Discovery & classification

Also known as 2025 K4

Named

Sources