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🌎  Greenwich, United Kingdom [change]

Comet C/2021 U5 (Catalina)

Comet C/2021 U5 (Catalina) is currently in the constellation of Antlia. The current Right Ascension of Comet C/2021 U5 (Catalina) is 10h 19m 58s and the Declination is -27° 58’ 42” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 U5 (Catalina) is 17.31 (JPL).

Summary of key facts about Comet C/2021 U5 (Catalina) [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

10h 19m 58s
-27° 58’ 42”
  • C/2021 U5 (Catalina) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-East direction at an altitude of 2° above the horizon.
  • Given its current magnitude, C/2021 U5 (Catalina) is visible only through long exposure photography.
  • See also C/2021 U5 (Catalina) rise and set times.
  • 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.

Additional information about Comet C/2021 U5 (Catalina) available on TheSkyLive:

Available Resources

Comet C/2021 U5 (Catalina) Position and Finder Charts

Below we provide Comet C/2021 U5 (Catalina) finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Comet C/2021 U5 (Catalina) in Antlia on January, 19 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2021 U5 (Catalina) in Antlia on January, 19 2022
Field of view: 10x6 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2021 U5 (Catalina) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 U5 (Catalina)
RA: 10h 19m 58s
Dec: -27° 58’ 42”
Deep sky finder chart for Comet C/2021 U5 (Catalina)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2021 U5 (Catalina)?, a page that provides all the information needed to find Comet C/2021 U5 (Catalina) in the sky and additional links to sky charts.

Comet C/2021 U5 (Catalina) Distance from Earth

The distance of Comet C/2021 U5 (Catalina) from Earth is currently 252,952,006 kilometers, equivalent to 1.690880 Astronomical Units. Light takes 14 minutes and 3.7571 seconds to travel from Comet C/2021 U5 (Catalina) and arrive to us.

14 minutes and 3.7571 seconds

The following chart shows the distance of Comet C/2021 U5 (Catalina) 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.

Distance of Comet C/2021 U5 (Catalina) from Earth between January 2013 and December 2100

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/2021 U5 (Catalina) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2021 U5 (Catalina) to Earth

Between January 2013 and December 2100, the closest approach of Comet C/2021 U5 (Catalina) to Earth happens on Fri Mar 4 2022 at a distance of 1.465305 Astronomical Units, or 219,206,557 kilometers:

Fri Mar 4 2022

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

Comet C/2021 U5 (Catalina) brightness

The current visual magnitude of Comet C/2021 U5 (Catalina) is 17.31.


The observed magnitude and coma diameter values are derived from the Comet Observers Database by averaging the values reported in recent observations (more recent than 4 days), when available. The Estimated Magnitude comes from the JPL Horizons ephemerides service and might be inaccurate given the highly dynamic and unpredictable behavior of comets. When available, please refer to the Observed Magnitude value and consider the Estimated 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.

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2021 U5 (Catalina), 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.

Predicted magnitude of Comet C/2021 U5 (Catalina) between January 2013 and December 2100

Comet C/2021 U5 (Catalina) rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Comet C/2021 U5 (Catalina) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 118.0°
Max altitude: 10.5°
Azimuth: 242.0°

The rise and set times are defined as the time at which the upper limb of Comet C/2021 U5 (Catalina) touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet C/2021 U5 (Catalina) Orbital Elements

The following table lists the orbital elements of Comet C/2021 U5 (Catalina) at epoch 19 November 2021 00:00 UTC (JD: 2459538.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.98974274
Orbit inclination i 39.04830397°
Perihelion distance q 2.36371112 AU
353,606,151 km
Aphelion distance Q 458.52191596 AU
68,593,902,435 km
Semi-major axis a 230.44281354 AU
34,473,754,293 km
Orbital period period 3,498.2670 years
1,277,742.0291 days
Date of perihelion transit Tp 2022-Jan-26 14:10:26
2,459,606.0906 JD
Argument of perihelion peri 321.45629374215°
Longitude of the ascending node node 182.76552698351°
Mean anomaly M 359.98095655634°
Mean motion n 0.00028175°/day

Visualization of Comet C/2021 U5 (Catalina) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 U5 (Catalina) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 U5 (Catalina) and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Comet C/2021 U5 (Catalina)
View Comet C/2021 U5 (Catalina) in the 3D Solar System Simulator

Comet C/2021 U5 (Catalina) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2021 U5 (Catalina) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2021 U5 (Catalina) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 Jan 12 10h 17m 30s -28° 25’ 31” 17.42 Antlia
2022 Jan 13 10h 17m 53s -28° 23’ 34” 17.41 Antlia
2022 Jan 14 10h 18m 15s -28° 21’ 14” 17.39 Antlia
2022 Jan 15 10h 18m 34s -28° 18’ 29” 17.38 Antlia
2022 Jan 16 10h 18m 53s -28° 15’ 20” 17.36 Antlia
2022 Jan 17 10h 19m 13s -28° 11’ 47” 17.35 Antlia
2022 Jan 18 10h 19m 28s -28° 07’ 47” 17.33 Antlia
2022 Jan 19 10h 19m 45s -28° 03’ 23” 17.32 Antlia
2022 Jan 20 10h 19m 59s -27° 58’ 32” 17.31 Antlia
2022 Jan 21 10h 20m 12s -27° 53’ 14” 17.29 Antlia
2022 Jan 22 10h 20m 25s -27° 47’ 30” 17.28 Antlia
2022 Jan 23 10h 20m 35s -27° 41’ 18” 17.27 Antlia
2022 Jan 24 10h 20m 44s -27° 34’ 39” 17.26 Antlia
2022 Jan 25 10h 20m 53s -27° 27’ 32” 17.24 Hydra