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🌎  Greenwich, United Kingdom [change]

Comet C/2021 P4 (ATLAS)

Comet C/2021 P4 (ATLAS) is currently in the constellation of Camelopardalis. The current Right Ascension of Comet C/2021 P4 (ATLAS) is 05h 08m 21s and the Declination is +58° 09’ 42” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 P4 (ATLAS) is 13.34 (JPL).

Summary of key facts about Comet C/2021 P4 (ATLAS) [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]:

05h 08m 21s
+58° 09’ 42”
  • C/2021 P4 (ATLAS) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the North-West direction at an altitude of 56° above the horizon.
  • Given its current magnitude, C/2021 P4 (ATLAS) is visible with the help of a telescope havng an aperture of 10 inches (250mm) or more.
  • See also C/2021 P4 (ATLAS) 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 P4 (ATLAS) available on TheSkyLive:

Available Resources

Comet C/2021 P4 (ATLAS) Position and Finder Charts

Below we provide Comet C/2021 P4 (ATLAS) 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 P4 (ATLAS) in Camelopardalis on May, 18 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2021 P4 (ATLAS) in Camelopardalis on May, 18 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 P4 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 P4 (ATLAS)
RA: 05h 08m 21s
Dec: +58° 09’ 42”
Deep sky finder chart for Comet C/2021 P4 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2021 P4 (ATLAS)?, a page that provides all the information needed to find Comet C/2021 P4 (ATLAS) in the sky and additional links to sky charts.

Comet C/2021 P4 (ATLAS) Distance from Earth

The distance of Comet C/2021 P4 (ATLAS) from Earth is currently 326,790,738 kilometers, equivalent to 2.184461 Astronomical Units. Light takes 18 minutes and 10.0566 seconds to travel from Comet C/2021 P4 (ATLAS) and arrive to us.

18 minutes and 10.0566 seconds

The following chart shows the distance of Comet C/2021 P4 (ATLAS) 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 P4 (ATLAS) 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 P4 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2021 P4 (ATLAS) to Earth

Between January 2013 and December 2100, the closest approach of Comet C/2021 P4 (ATLAS) to Earth happens on Wed Jul 13 2022 at a distance of 1.957900 Astronomical Units, or 292,897,645 kilometers:

Wed Jul 13 2022

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

Comet C/2021 P4 (ATLAS) brightness

The current visual magnitude of Comet C/2021 P4 (ATLAS) is 13.34.


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 P4 (ATLAS), 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 P4 (ATLAS) between January 2013 and December 2100

Comet C/2021 P4 (ATLAS) rise and set times

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

Comet C/2021 P4 (ATLAS) is circumpolar and transits at 13:23 UTC (altitude: 83.3°)

The rise and set times are defined as the time at which the upper limb of Comet C/2021 P4 (ATLAS) 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 P4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2021 P4 (ATLAS) at epoch 14 November 2021 00:00 UTC (JD: 2459533.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99650204
Orbit inclination i 56.31048741°
Perihelion distance q 1.08049634 AU
161,639,952 km
Aphelion distance Q 616.70526243 AU
92,257,794,294 km
Semi-major axis a 308.89287938 AU
46,209,717,123 km
Orbital period period 5,429.0026 years
1,982,943.1913 days
Date of perihelion transit Tp 2022-Jul-30 09:16:56
2,459,790.8868 JD
Argument of perihelion peri 175.82417390047°
Longitude of the ascending node node 348.09413091728°
Mean anomaly M 359.95327186668°
Mean motion n 0.00018155°/day

Visualization of Comet C/2021 P4 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 P4 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 P4 (ATLAS) 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 P4 (ATLAS)
View Comet C/2021 P4 (ATLAS) in the 3D Solar System Simulator

Comet C/2021 P4 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2021 P4 (ATLAS) 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 P4 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 May 11 04h 24m 14s +59° 09’ 42” 13.62 Camelopardalis
2022 May 12 04h 29m 53s +59° 04’ 36” 13.58 Camelopardalis
2022 May 13 04h 35m 35s +58° 58’ 42” 13.55 Camelopardalis
2022 May 14 04h 41m 17s +58° 52’ 04” 13.51 Camelopardalis
2022 May 15 04h 46m 59s +58° 44’ 38” 13.47 Camelopardalis
2022 May 16 04h 52m 44s +58° 36’ 23” 13.44 Camelopardalis
2022 May 17 04h 58m 28s +58° 27’ 19” 13.40 Camelopardalis
2022 May 18 05h 04m 13s +58° 17’ 23” 13.36 Camelopardalis
2022 May 19 05h 09m 57s +58° 06’ 38” 13.33 Camelopardalis
2022 May 20 05h 15m 42s +57° 55’ 01” 13.29 Camelopardalis
2022 May 21 05h 21m 25s +57° 42’ 33” 13.25 Camelopardalis
2022 May 22 05h 27m 08s +57° 29’ 12” 13.22 Camelopardalis
2022 May 23 05h 32m 51s +57° 14’ 57” 13.18 Camelopardalis
2022 May 24 05h 38m 30s +56° 59’ 51” 13.14 Camelopardalis