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public LocationGreenwich, UK
Sunrise: 5:10 
Transit: 13:06 
Sunset: 21:02
wb_twilight   (Civil Twilight)   What's Visible Now?
Comets » 

Comet C/2022 U4 (Bok)

Above the horizon.  Rise: 19:12 | Tran: 1:06 | Set: 6:56
Alt: 16.79°   Az: 115.35°   Direction: East-South-East

Comet C/2022 U4 (Bok) is in the constellation of Aquila, at a distance of 523,149,873.0 kilometers from Earth. The current Right Ascension is 20h 02m 46s and the Declination is -01° 40’ 51” (apparent coordinates). The predicted magnitude of Comet C/2022 U4 (Bok) is 20.25 (data provided by JPL Horizons).

Finder chart of C/2022 U4 (Bok) in Aquila on July,21 2024
Map showing Comet C/2022 U4 (Bok) in Aquila on July, 21 2024. Field of view: 50x30 degrees
View interactive star map

Celestial Coordinates


20h 02m 46s
-01° 40’ 51”
20h 00m 12s
16h 02m 59s


20h 01m 30s
-01° 45’ 01”

Additional Information


The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted Magnitude as a directional indication. We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations.

Rise and Set Times

Today's rise, transit and set times of Comet C/2022 U4 (Bok) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 91.7°
Max altitude: 37.0°
Azimuth: 268.4°
  • C/2022 U4 (Bok) is above the horizon from Greenwich, UK.
  • Right now it is placed in the East-South-East direction at an altitude of 16.79° above the horizon.
  • Given its current magnitude, C/2022 U4 (Bok) is visible only through long exposure photography.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Finder Charts

Finder chart of C/2022 U4 (Bok)
Sky map showing Comet C/2022 U4 (Bok) in Aquila on July, 21 2024. Field of view: 10x6 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2022 U4 (Bok) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2022 U4 (Bok)
RA: 20h 01m 30s
Dec: -01° 45’ 01”
Deep sky finder chart for Comet C/2022 U4 (Bok). Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Comet C/2022 U4 (Bok)?, a page that provides all the information needed to find Comet C/2022 U4 (Bok) in the sky and additional links to sky charts.

Distance from Earth

The distance of Comet C/2022 U4 (Bok) from Earth is currently 523,149,873.0 kilometers, equivalent to 3.4970409041 Astronomical Units. Light takes 29m 5.040s to travel from Comet C/2022 U4 (Bok) and arrive to us.

29m 5.040s

The following chart shows the distance of Comet C/2022 U4 (Bok) from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Chart of the distance of Comet C/2022 U4 (Bok) from Earth in Astronomical Units (au)

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2022 U4 (Bok) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 2013 and 30 December 2100, the closest approach of Comet C/2022 U4 (Bok) to Earth happens on Fri Mar 24 2023 at a distance of 2.515961 Astronomical Units, or 376,382,421 kilometers:

Fri Mar 24 2023

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2022 U4 (Bok), according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Chart of the magnitude of Comet C/2022 U4 (Bok) as a function of time

Orbital Elements

The following table lists the orbital elements of Comet C/2022 U4 (Bok) at epoch 28 October 2022 00:00 UTC (JD: 2459881.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99923972
Orbit inclination i 52.03927684°
Perihelion distance q 2.89823704 AU
433,570,091 km
Aphelion distance Q 7,621.19195984 AU
1,140,114,091,674 km
Semi-major axis a 3,812.04509844 AU
570,273,830,883 km
Orbital period period 235,366.8240 years
85,967,732.4787 days
Date of perihelion transit Tp 2023-Aug-03 16:39:12
2,460,160.1939 JD
Next perihelion transit 237395-Mar-31 04:08
88,427,892.6726 JD
Argument of perihelion peri 89.011065570489°
Longitude of the ascending node node 132.93315095813°
Mean anomaly M 359.99883293651°
Mean motion n 0.00000419°/day

Orbit Visualization

Orbit Diagram of Comet C/2022 U4 (Bok)
View Comet C/2022 U4 (Bok) in the 3D Solar System Simulator

15 Days Ephemeris

The following table lists the ephemerides of Comet C/2022 U4 (Bok) computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2024 Jul 14 20h 07m 34s -00° 28’ 55” 20.16 Aquila
2024 Jul 15 20h 06m 57s -00° 37’ 51” 20.17 Aquila
2024 Jul 16 20h 06m 20s -00° 46’ 51” 20.18 Aquila
2024 Jul 17 20h 05m 44s -00° 55’ 56” 20.20 Aquila
2024 Jul 18 20h 05m 07s -01° 05’ 06” 20.21 Aquila
2024 Jul 19 20h 04m 30s -01° 14’ 19” 20.22 Aquila
2024 Jul 20 20h 03m 54s -01° 23’ 37” 20.23 Aquila
2024 Jul 21 20h 03m 17s -01° 33’ 00” 20.24 Aquila
2024 Jul 22 20h 02m 40s -01° 42’ 25” 20.25 Aquila
2024 Jul 23 20h 02m 04s -01° 51’ 53” 20.26 Aquila
2024 Jul 24 20h 01m 27s -02° 01’ 25” 20.28 Aquila
2024 Jul 25 20h 00m 51s -02° 11’ 00” 20.29 Aquila
2024 Jul 26 20h 00m 15s -02° 20’ 37” 20.30 Aquila
2024 Jul 27 19h 59m 39s -02° 30’ 17” 20.31 Aquila

Additional Resources