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Comet C/2017 M4 (ATLAS)

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Comet C/2017 M4 (ATLAS) Position

Comet C/2017 M4 (ATLAS) is currently in the constellation of Circinus. The current Right Ascension is 14h 26m 12s and the Declination is -67° 52’ 01”.

14h 26m 12s
-67° 52’ 01”

Simplified sky chart showing where Comet C/2017 M4 (ATLAS) is right now in the sky with respect to the brightest stars and constellations (see full screen Online Planetarium)

Map showing Comet C/2017 M4 (ATLAS) in Circinus on January, 25 2020
Field of view: 60x30 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 showing where Comet C/2017 M4 (ATLAS) is right now (view fullscreen)

C/2017 M4 (ATLAS)
RA: 14h 26m 12s
Dec: -67° 52’ 01”
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

The distance of Comet C/2017 M4 (ATLAS) from Earth is currently 736,104,668 kilometers, equivalent to 4.920556 Astronomical Units. Light takes 40 minutes and 55.3809 seconds to travel from Comet C/2017 M4 (ATLAS) and arrive to us.

40 minutes and 55.3809 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 2.48071180 Astronomical Units, or 371,109,204 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 17.05.


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 13 May 2018 00:00 UTC (JD: 2458252.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00105715
Orbit inclination i 105.65714829°
Perihelion distance q 3.25173984 AU
486,453,358 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 08:06:21
2,458,501.8377 JD
Argument of perihelion peri 167.65132358628°
Longitude of the ascending node node 65.868133245418°
Mean anomaly M -0.0014405429288788°
Mean motion n 0.00000578°/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 Jan 18 14h 30m 35s -65° 58’ 11” 17.03 Circinus
2020 Jan 19 14h 30m 11s -66° 12’ 50” 17.04 Circinus
2020 Jan 20 14h 29m 44s -66° 27’ 29” 17.04 Circinus
2020 Jan 21 14h 29m 13s -66° 42’ 09” 17.04 Circinus
2020 Jan 22 14h 28m 41s -66° 56’ 48” 17.04 Circinus
2020 Jan 23 14h 28m 05s -67° 11’ 30” 17.05 Circinus
2020 Jan 24 14h 27m 28s -67° 26’ 11” 17.05 Circinus
2020 Jan 25 14h 26m 47s -67° 40’ 51” 17.05 Circinus
2020 Jan 26 14h 26m 02s -67° 55’ 32” 17.05 Circinus
2020 Jan 27 14h 25m 14s -68° 10’ 10” 17.06 Circinus
2020 Jan 28 14h 24m 24s -68° 24’ 48” 17.06 Circinus
2020 Jan 29 14h 23m 30s -68° 39’ 25” 17.06 Circinus
2020 Jan 30 14h 22m 32s -68° 54’ 01” 17.06 Circinus
2020 Jan 31 14h 21m 29s -69° 08’ 34” 17.07 Circinus