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Comet C/2017 M4 (ATLAS)

Available Resources

Comet C/2017 M4 (ATLAS) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2017 M4 (ATLAS) is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Comet C/2017 M4 (ATLAS) in Hercules on October, 19 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
16h 26m 00s
+05° 10’ 53”

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 behvior 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.

Comet C/2017 M4 (ATLAS) Rise and Set Times

Today's Comet C/2017 M4 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 84.7°
Max altitude: 43.8°
Azimuth: 275.2°

Comet C/2017 M4 (ATLAS) Orbit Diagram

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) 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
2018 Oct 12 16h 22m 55s +07° 22’ 59” 15.40 Hercules
2018 Oct 13 16h 23m 17s +07° 05’ 34” 15.41 Hercules
2018 Oct 14 16h 23m 39s +06° 48’ 16” 15.41 Hercules
2018 Oct 15 16h 24m 02s +06° 31’ 08” 15.41 Hercules
2018 Oct 16 16h 24m 26s +06° 14’ 07” 15.41 Hercules
2018 Oct 17 16h 24m 51s +05° 57’ 14” 15.42 Hercules
2018 Oct 18 16h 25m 14s +05° 40’ 28” 15.42 Hercules
2018 Oct 19 16h 25m 40s +05° 23’ 52” 15.42 Hercules
2018 Oct 20 16h 26m 05s +05° 07’ 23” 15.42 Hercules
2018 Oct 21 16h 26m 31s +04° 51’ 02” 15.43 Hercules
2018 Oct 22 16h 26m 58s +04° 34’ 49” 15.43 Hercules
2018 Oct 23 16h 27m 25s +04° 18’ 42” 15.43 Hercules
2018 Oct 24 16h 27m 53s +04° 02’ 44” 15.43 Hercules
2018 Oct 25 16h 28m 22s +03° 46’ 54” 15.43 Hercules

Distance of Comet C/2017 M4 (ATLAS) from Earth

The following chart shows the distance of Comet C/2017 M4 (ATLAS) from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2017 M4 (ATLAS) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2017 M4 (ATLAS) from Earth between January 2013 and December 2075

Light Curve of Comet C/2017 M4 (ATLAS)

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 2075

Comet C/2017 M4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 M4 (ATLAS) at epoch 21 March 2018 00:00 UTC (JD: 2458199.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00103594
Orbit inclination i 105.65738922°
Perihelion distance q 3.25183283 AU
486,467,268 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 07:59:18
2,458,501.8329 JD
Argument of perihelion peri 167.64858713093°
Longitude of the ascending node node 65.867582902888°
Mean anomaly M -0.0016943265889226°
Mean motion n 0.00000560°/day
Closest approach to Earth* 2019-May-14
Distance of closest approach* 2.48068764 AU
371,105,589 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2075-Dec-31, with a sampling interval of 1 day.