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Comet

Wierzchos

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P/2021 U1 (Wierzchos)

Where is it now

Distance from Sun
10.726 AU
True anomaly
148.79°
Distance from Earth
11.524 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 Wierzchos — 10.726 AU from the Sun Wierzchos
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Wierzchos is 11.524 AU from Earth today (1.6 light-hours).

In the sky

Right ascension
11h 39m 56s
Declination
-25° 57′ 50″
Constellation
Hydra
Distance from Earth
11.52 AU
Elongation from the Sun
35.3° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
8.512 AU
Eccentricity
0.7128
Inclination
30.56°
Orbital period
24.83 years
Perihelion
2.445 AU
Aphelion
14.579 AU
Longitude of ascending node
246.79°
Argument of periapsis
145.04°
Epoch · J2000
2459544.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 586.7 LD
1.5075 AU
Tisserand (Jupiter)
2.156

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
239
Data arc
156 days
First observed
20 September 2021
Last observed
23 February 2022
Residual RMS
0.43 ″
Solution · Otto Matic
8 March 2022

Visual & observation

Absolute magnitude (H)
16
Total magnitude M₁ · K₁ 4.5
16

Discovery & classification

Also known as 2021 U1

Named

Sources