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Comet C/2017 K4 (ATLAS)

Available Resources

Comet C/2017 K4 (ATLAS) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2017 K4 (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 K4 (ATLAS) in Triangulum on April, 24 2019
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]
02h 25m 04s
+28° 35’ 56”

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 K4 (ATLAS) Rise and Set Times

Today's Comet C/2017 K4 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 61.4°
Max altitude: 67.1°
Azimuth: 298.6°

Comet C/2017 K4 (ATLAS) Orbit Diagram

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) 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
2019 Apr 17 02h 17m 07s +28° 04’ 04” 21.81 Triangulum
2019 Apr 18 02h 18m 07s +28° 08’ 08” 21.83 Triangulum
2019 Apr 19 02h 19m 09s +28° 12’ 12” 21.84 Triangulum
2019 Apr 20 02h 20m 11s +28° 16’ 18” 21.86 Triangulum
2019 Apr 21 02h 21m 11s +28° 20’ 23” 21.87 Triangulum
2019 Apr 22 02h 22m 13s +28° 24’ 29” 21.88 Triangulum
2019 Apr 23 02h 23m 13s +28° 28’ 36” 21.90 Triangulum
2019 Apr 24 02h 24m 15s +28° 32’ 43” 21.91 Triangulum
2019 Apr 25 02h 25m 17s +28° 36’ 48” 21.92 Triangulum
2019 Apr 26 02h 26m 17s +28° 40’ 55” 21.94 Triangulum
2019 Apr 27 02h 27m 18s +28° 45’ 02” 21.95 Triangulum
2019 Apr 28 02h 28m 18s +28° 49’ 09” 21.96 Triangulum
2019 Apr 29 02h 29m 20s +28° 53’ 17” 21.98 Triangulum
2019 Apr 30 02h 30m 20s +28° 57’ 24” 21.99 Triangulum

Distance of Comet C/2017 K4 (ATLAS) from Earth

The following chart shows the distance of Comet C/2017 K4 (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 K4 (ATLAS) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2017 K4 (ATLAS) from Earth between January 2013 and December 2100

Light Curve of Comet C/2017 K4 (ATLAS)

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) Orbital Elements

The following table lists the orbital elements of Comet C/2017 K4 (ATLAS) at epoch 16 January 2018 00:00 UTC (JD: 2458135.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.90579828
Orbit inclination i 16.67893627°
Perihelion distance q 2.64807678 AU
396,146,649 km
Aphelion distance Q 53.57333539 AU
8,014,456,916 km
Semi-major axis a 28.11070608 AU
4,205,301,782 km
Orbital period period 149.0400 years
54,438.4885 days
Date of perihelion transit Tp 2018-Jan-08 00:50:48
2,458,126.5353 JD
Next perihelion transit 2167-Jan-25 12:34
2,512,565.0238 JD
Argument of perihelion peri 15.10946246398°
Longitude of the ascending node node 298.89777111493°
Mean anomaly M 0.059283359796883°
Mean motion n 0.00661297°/day
Closest approach to Earth* 2017-Jul-03
Distance of closest approach* 2.31072874 AU
345,680,101 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2100-Dec-31, with a sampling interval of 1 day.