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🌎 Location: Greenwich, United Kingdom [change]

Comet C/2017 M4 (ATLAS)

Comet C/2017 M4 (ATLAS) is currently in the constellation of Vela. The current Right Ascension of Comet C/2017 M4 (ATLAS) is 09h 46m 35s and the Declination is -56° 15’ 04” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2017 M4 (ATLAS) is 18.08 (JPL).

Summary of key facts about Comet C/2017 M4 (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]:

09h 46m 35s
-56° 15’ 04”

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Additional information about Comet C/2017 M4 (ATLAS) available on TheSkyLive:

Available Resources

Comet C/2017 M4 (ATLAS) Position and Finder Charts

Below we provide Comet C/2017 M4 (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/2017 M4 (ATLAS) in Vela on August, 12 2020
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2017 M4 (ATLAS) in Vela on August, 12 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/2017 M4 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2017 M4 (ATLAS)
RA: 09h 46m 35s
Dec: -56° 15’ 04”
Deep sky finder chart for Comet C/2017 M4 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2017 M4 (ATLAS)?, a page that provides all the information needed to find Comet C/2017 M4 (ATLAS) in the sky and additional links to sky charts.

Comet C/2017 M4 (ATLAS) Distance from Earth

The distance of Comet C/2017 M4 (ATLAS) from Earth is currently 940,579,058 kilometers, equivalent to 6.287383 Astronomical Units. Light takes 52 minutes and 17.4340 seconds to travel from Comet C/2017 M4 (ATLAS) and arrive to us.

52 minutes and 17.4340 seconds

The following chart shows the distance of Comet C/2017 M4 (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/2017 M4 (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/2017 M4 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2017 M4 (ATLAS) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2017 M4 (ATLAS) to Earth happens on Tue May 14 2019 at a distance of 2.48075465 Astronomical Units, or 371,115,615 kilometers:

Tue May 14 2019

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

Comet C/2017 M4 (ATLAS) brightness

The current visual magnitude of Comet C/2017 M4 (ATLAS) is 18.08.


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/2017 M4 (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/2017 M4 (ATLAS) between January 2013 and December 2100

Comet C/2017 M4 (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/2017 M4 (ATLAS) is currently not visible from Greenwich, United Kingdom [change]

The rise and set times are defined as the time at which the upper limb of Comet C/2017 M4 (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/2017 M4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 M4 (ATLAS) at epoch 04 June 2018 00:00 UTC (JD: 2458274.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00107184
Orbit inclination i 105.65712538°
Perihelion distance q 3.25171518 AU
486,449,669 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2019-Jan-18 08:09:09
2,458,501.8397 JD
Argument of perihelion peri 167.65220192026°
Longitude of the ascending node node 65.868275327212°
Mean anomaly M -0.0013409230262861°
Mean motion n 0.00000590°/day

Visualization of Comet C/2017 M4 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 M4 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 M4 (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/2017 M4 (ATLAS)
View Comet C/2017 M4 (ATLAS) in the 3D Solar System Simulator

Comet C/2017 M4 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2017 M4 (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/2017 M4 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Aug 05 09h 41m 57s -56° 18’ 51” 18.02 Vela
2020 Aug 06 09h 42m 33s -56° 17’ 53” 18.03 Vela
2020 Aug 07 09h 43m 08s -56° 17’ 03” 18.03 Vela
2020 Aug 08 09h 43m 44s -56° 16’ 23” 18.04 Vela
2020 Aug 09 09h 44m 20s -56° 15’ 51” 18.05 Vela
2020 Aug 10 09h 44m 56s -56° 15’ 27” 18.06 Vela
2020 Aug 11 09h 45m 32s -56° 15’ 11” 18.06 Vela
2020 Aug 12 09h 46m 08s -56° 15’ 03” 18.07 Vela
2020 Aug 13 09h 46m 42s -56° 15’ 05” 18.08 Vela
2020 Aug 14 09h 47m 18s -56° 15’ 15” 18.09 Vela
2020 Aug 15 09h 47m 53s -56° 15’ 32” 18.09 Vela
2020 Aug 16 09h 48m 29s -56° 15’ 57” 18.10 Vela
2020 Aug 17 09h 49m 05s -56° 16’ 31” 18.11 Vela
2020 Aug 18 09h 49m 41s -56° 17’ 12” 18.11 Vela