Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Comet C/2020 R4 (ATLAS)

Comet C/2020 R4 (ATLAS) is currently in the constellation of Cetus. The current Right Ascension of Comet C/2020 R4 (ATLAS) is 00h 24m 19s and the Declination is -18° 32’ 22” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2020 R4 (ATLAS) is 16.65 (JPL).

Summary of key facts about Comet C/2020 R4 (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]:

00h 24m 19s
-18° 32’ 22”
Cetus
16.65
  • C/2020 R4 (ATLAS) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-West direction at an altitude of 5° above the horizon.
  • Given its current magnitude, C/2020 R4 (ATLAS) is visible only through long exposure photography.
  • See also C/2020 R4 (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/2020 R4 (ATLAS) available on TheSkyLive:

Available Resources

Comet C/2020 R4 (ATLAS) Position and Finder Charts

Below we provide Comet C/2020 R4 (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/2020 R4 (ATLAS) in Cetus on October, 21 2020
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2020 R4 (ATLAS) in Cetus on October, 21 2020
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/2020 R4 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2020 R4 (ATLAS)
RA: 00h 24m 19s
Dec: -18° 32’ 22”
Deep sky finder chart for Comet C/2020 R4 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2020 R4 (ATLAS)?, a page that provides all the information needed to find Comet C/2020 R4 (ATLAS) in the sky and additional links to sky charts.

Comet C/2020 R4 (ATLAS) Distance from Earth

The distance of Comet C/2020 R4 (ATLAS) from Earth is currently 204,709,854 kilometers, equivalent to 1.368401 Astronomical Units. Light takes 11 minutes and 22.8386 seconds to travel from Comet C/2020 R4 (ATLAS) and arrive to us.

204,709,854
1.368401
11 minutes and 22.8386 seconds

The following chart shows the distance of Comet C/2020 R4 (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/2020 R4 (ATLAS) from Earth between January 2014 and January 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/2020 R4 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2020 R4 (ATLAS) to Earth

Between January 2014 and January 2100, the closest approach of Comet C/2020 R4 (ATLAS) to Earth happens on Fri Apr 23 2021 at a distance of 0.459809 Astronomical Units, or 68,786,391 kilometers:

Fri Apr 23 2021
68,786,391
0.459809

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

Comet C/2020 R4 (ATLAS) brightness

The current visual magnitude of Comet C/2020 R4 (ATLAS) is 16.65.

16.65
-
-

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/2020 R4 (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/2020 R4 (ATLAS) between January 2014 and January 2100

Comet C/2020 R4 (ATLAS) 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/2020 R4 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 108.8°
Max altitude: 19.7°
Azimuth: 251.5°

The rise and set times are defined as the time at which the upper limb of Comet C/2020 R4 (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/2020 R4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2020 R4 (ATLAS) at epoch 12 September 2020 00:00 UTC (JD: 2459105.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.98655434
Orbit inclination i 164.45730930°
Perihelion distance q 1.02623906 AU
153,523,179 km
Aphelion distance Q 151.62364116 AU
22,682,573,911 km
Semi-major axis a 76.32494011 AU
11,418,048,545 km
Orbital period period 666.8200 years
243,555.6087 days
Date of perihelion transit Tp 2021-Mar-02 03:28:30
2,459,275.6448 JD
Argument of perihelion peri 46.95479041981°
Longitude of the ascending node node 323.31471877056°
Mean anomaly M 359.74850865221°
Mean motion n 0.00147810°/day

Visualization of Comet C/2020 R4 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2020 R4 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2020 R4 (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/2020 R4 (ATLAS)
View Comet C/2020 R4 (ATLAS) in the 3D Solar System Simulator

Comet C/2020 R4 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2020 R4 (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/2020 R4 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Oct 14 00h 57m 25s -15° 56’ 29” 17.08 Cetus
2020 Oct 15 00h 52m 53s -16° 20’ 07” 17.01 Cetus
2020 Oct 16 00h 48m 16s -16° 43’ 18” 16.95 Cetus
2020 Oct 17 00h 43m 37s -17° 05’ 58” 16.89 Cetus
2020 Oct 18 00h 38m 57s -17° 28’ 05” 16.83 Cetus
2020 Oct 19 00h 34m 14s -17° 49’ 36” 16.77 Cetus
2020 Oct 20 00h 29m 30s -18° 10’ 26” 16.71 Cetus
2020 Oct 21 00h 24m 43s -18° 30’ 34” 16.66 Cetus
2020 Oct 22 00h 19m 58s -18° 49’ 59” 16.60 Cetus
2020 Oct 23 00h 15m 11s -19° 08’ 36” 16.54 Cetus
2020 Oct 24 00h 10m 26s -19° 26’ 26” 16.49 Cetus
2020 Oct 25 00h 05m 40s -19° 43’ 27” 16.44 Cetus
2020 Oct 26 00h 00m 56s -19° 59’ 36” 16.38 Cetus
2020 Oct 27 23h 56m 13s -20° 14’ 54” 16.33 Aquarius