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

Comet C/2017 K4 (ATLAS)

Available Resources

Comet C/2017 K4 (ATLAS) Position

Comet C/2017 K4 (ATLAS) is currently in the constellation of Perseus. The current Right Ascension is 03h 40m 54s and the Declination is +32° 15’ 23”.

03h 40m 54s
+32° 15’ 23”

Simplified sky chart showing where Comet C/2017 K4 (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 K4 (ATLAS) in Perseus on April, 05 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 K4 (ATLAS) is right now (view fullscreen)

C/2017 K4 (ATLAS)
RA: 03h 40m 54s
Dec: +32° 15’ 23”
Deep sky finder chart for Comet C/2017 K4 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2017 K4 (ATLAS)?, a page that provides all the information needed to find Comet C/2017 K4 (ATLAS) in the sky and additional links to sky charts.

Comet C/2017 K4 (ATLAS) Distance

The distance of Comet C/2017 K4 (ATLAS) from Earth is currently 1,212,233,182 kilometers, equivalent to 8.103278 Astronomical Units. Light takes 1 hours, 7 minutes and 23.5746 seconds to travel from Comet C/2017 K4 (ATLAS) and arrive to us.

1 hours, 7 minutes and 23.5746 seconds

The following chart shows the distance of Comet C/2017 K4 (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 K4 (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 K4 (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 K4 (ATLAS) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2017 K4 (ATLAS) to Earth happens on Mon Jul 3 2017 at a distance of 2.31073894 Astronomical Units, or 345,681,627 kilometers:

Mon Jul 3 2017

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

Comet C/2017 K4 (ATLAS) brightness

The current visual magnitude of Comet C/2017 K4 (ATLAS) is 25.36.


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 K4 (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 K4 (ATLAS) between January 2013 and December 2100

Comet C/2017 K4 (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/2017 K4 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 57.7°
Max altitude: 70.8°
Azimuth: 302.2°
Comet C/2017 K4 (ATLAS) is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet C/2017 K4 (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 K4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 K4 (ATLAS) at epoch 06 April 2018 00:00 UTC (JD: 2458215.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.90586825
Orbit inclination i 16.67866290°
Perihelion distance q 2.64808727 AU
396,148,218 km
Aphelion distance Q 53.61533385 AU
8,020,739,797 km
Semi-major axis a 28.13171056 AU
4,208,444,007 km
Orbital period period 149.2100 years
54,499.5150 days
Date of perihelion transit Tp 2018-Jan-08 01:02:05
2,458,126.5431 JD
Next perihelion transit 2167-Mar-27 13:23
2,512,626.0581 JD
Argument of perihelion peri 15.112233808788°
Longitude of the ascending node node 298.89715120088°
Mean anomaly M 0.5876103367356°
Mean motion n 0.00660556°/day

Visualization of Comet C/2017 K4 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 K4 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 K4 (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 K4 (ATLAS)
View Comet C/2017 K4 (ATLAS) in the 3D Solar System Simulator

Comet C/2017 K4 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2017 K4 (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 K4 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Mar 29 03h 36m 12s +32° 12’ 55” 25.26 Perseus
2020 Mar 30 03h 36m 47s +32° 13’ 08” 25.28 Perseus
2020 Mar 31 03h 37m 22s +32° 13’ 22” 25.29 Perseus
2020 Apr 01 03h 37m 56s +32° 13’ 37” 25.30 Perseus
2020 Apr 02 03h 38m 33s +32° 13’ 55” 25.31 Perseus
2020 Apr 03 03h 39m 07s +32° 14’ 14” 25.32 Perseus
2020 Apr 04 03h 39m 43s +32° 14’ 36” 25.33 Perseus
2020 Apr 05 03h 40m 19s +32° 14’ 58” 25.34 Perseus
2020 Apr 06 03h 40m 55s +32° 15’ 24” 25.36 Perseus
2020 Apr 07 03h 41m 32s +32° 15’ 50” 25.37 Perseus
2020 Apr 08 03h 42m 10s +32° 16’ 17” 25.38 Perseus
2020 Apr 09 03h 42m 47s +32° 16’ 45” 25.39 Perseus
2020 Apr 10 03h 43m 23s +32° 17’ 16” 25.40 Perseus
2020 Apr 11 03h 44m 00s +32° 17’ 48” 25.41 Perseus