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Comet

Bok

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C/2022 U4 (Bok)

Bok is a comet in the Comet orbit class. Its orbit takes it from 2.9 AU to 7,348.06 AU from the Sun; one orbit takes 222,832.8 years. Orbit from the JPL solution of 18 November 2023.

Where is it now

Distance from Sun
10.155 AU
True anomaly
115.45°
Distance from Earth
9.781 AU
As of
25 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 Bok — 10.155 AU from the Sun Bok
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Bok is 9.781 AU from Earth today (1.4 light-hours).

In the sky

Right ascension
22h 11m 31s
Declination
-32° 25′ 05″
Constellation
Piscis Austrinus
Distance from Earth
9.79 AU
Elongation from the Sun
108.93° — well clear of the Sun

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
3,675.479 AU
Eccentricity
0.9992
Inclination
52.04°
Orbital period
222,832.8 years
Perihelion
2.898 AU
Aphelion
7,348.059 AU
Longitude of ascending node
132.93°
Argument of periapsis
89.01°
Epoch · J2000
2460047.5
Orbit class · COM
Comet
Earth MOID · 938.8 LD
2.4122 AU
Tisserand (Jupiter)
1.3

Orbit quality

Observations used
691
Data arc
625 days
First observed
7 January 2022
Last observed
24 September 2023
Residual RMS
0.54 ″
Solution · Otto Matic
18 November 2023

Visual & observation

Absolute magnitude (H)
12.2
Total magnitude M₁ · K₁ 8
12.2

Discovery & classification

Also known as 2022 U4

Named

Sources