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Comet ATLAS (C/2019 Y4)

Comet ATLAS (C/2019 Y4) is currently in the constellation of Monoceros. The current Right Ascension of Comet ATLAS (C/2019 Y4) is 06h 36m 20s and the Declination is +06° 40’ 02” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet ATLAS (C/2019 Y4) is 21.77 (JPL).

Summary of key facts about Comet ATLAS (C/2019 Y4) [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]:

06h 36m 20s
+06° 40’ 02”
  • C/2019 Y4 (ATLAS) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South direction at an altitude of 45° above the horizon.
  • Given its current magnitude, C/2019 Y4 (ATLAS) is visible only through long exposure photography.
  • See also C/2019 Y4 (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 ATLAS (C/2019 Y4) available on TheSkyLive:

Available Resources

Comet ATLAS (C/2019 Y4) Position and Finder Charts

Below we provide Comet ATLAS (C/2019 Y4) 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 ATLAS (C/2019 Y4) in Monoceros on June, 21 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet ATLAS (C/2019 Y4) in Monoceros on June, 21 2021
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 ATLAS (C/2019 Y4) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2019 Y4 (ATLAS)
RA: 06h 36m 20s
Dec: +06° 40’ 02”
Deep sky finder chart for Comet ATLAS (C/2019 Y4)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet ATLAS (C/2019 Y4)?, a page that provides all the information needed to find Comet ATLAS (C/2019 Y4) in the sky and additional links to sky charts.

Comet ATLAS (C/2019 Y4) Distance from Earth

The distance of Comet ATLAS (C/2019 Y4) from Earth is currently 984,404,867 kilometers, equivalent to 6.580340 Astronomical Units. Light takes 54 minutes and 43.6212 seconds to travel from Comet ATLAS (C/2019 Y4) and arrive to us.

54 minutes and 43.6212 seconds

The following chart shows the distance of Comet ATLAS (C/2019 Y4) 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 ATLAS (C/2019 Y4) 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/2019 Y4 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet ATLAS (C/2019 Y4) to Earth

Between January 2013 and December 2100, the closest approach of Comet ATLAS (C/2019 Y4) to Earth happens on Sun May 24 2020 at a distance of 0.785983 Astronomical Units, or 117,581,331 kilometers:

Sun May 24 2020

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

Comet ATLAS (C/2019 Y4) brightness

The current visual magnitude of Comet ATLAS (C/2019 Y4) is 21.77.


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 ATLAS (C/2019 Y4), 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 ATLAS (C/2019 Y4) between January 2013 and December 2100

Comet ATLAS (C/2019 Y4) 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 ATLAS (C/2019 Y4) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 83.3°
Max altitude: 45.2°
Azimuth: 276.7°

The rise and set times are defined as the time at which the upper limb of Comet ATLAS (C/2019 Y4) 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 ATLAS (C/2019 Y4) Orbital Elements

The following table lists the orbital elements of Comet ATLAS (C/2019 Y4) at epoch 08 April 2020 00:00 UTC (JD: 2458948.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00220952
Orbit inclination i 45.98190846°
Perihelion distance q 0.25034836 AU
37,451,582 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2020-May-31 01:06:56
2,459,000.5465 JD
Argument of perihelion peri 177.18432752223°
Longitude of the ascending node node 121.04661873201°
Mean anomaly M -0.042532965091786°
Mean motion n 0.00081721°/day

Visualization of Comet ATLAS (C/2019 Y4) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet ATLAS (C/2019 Y4) with respect of the Sun and the orbits of the major planets. The position of Comet ATLAS (C/2019 Y4) 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 ATLAS (C/2019 Y4)
View Comet ATLAS (C/2019 Y4) in the 3D Solar System Simulator

Comet ATLAS (C/2019 Y4) 15 Days Ephemeris

The following table lists the ephemerides of Comet ATLAS (C/2019 Y4) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet ATLAS (C/2019 Y4) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 Jun 14 06h 31m 23s +06° 36’ 41” 21.71 Monoceros
2021 Jun 15 06h 32m 03s +06° 37’ 17” 21.72 Monoceros
2021 Jun 16 06h 32m 41s +06° 37’ 50” 21.72 Monoceros
2021 Jun 17 06h 33m 21s +06° 38’ 21” 21.73 Monoceros
2021 Jun 18 06h 34m 00s +06° 38’ 48” 21.74 Monoceros
2021 Jun 19 06h 34m 41s +06° 39’ 12” 21.75 Monoceros
2021 Jun 20 06h 35m 20s +06° 39’ 34” 21.76 Monoceros
2021 Jun 21 06h 35m 58s +06° 39’ 54” 21.76 Monoceros
2021 Jun 22 06h 36m 38s +06° 40’ 09” 21.77 Monoceros
2021 Jun 23 06h 37m 18s +06° 40’ 23” 21.78 Monoceros
2021 Jun 24 06h 37m 57s +06° 40’ 33” 21.79 Monoceros
2021 Jun 25 06h 38m 35s +06° 40’ 41” 21.79 Monoceros
2021 Jun 26 06h 39m 15s +06° 40’ 45” 21.80 Monoceros
2021 Jun 27 06h 39m 54s +06° 40’ 47” 21.81 Monoceros