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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 Pisces on August, 18 2018
High Precision Live Sky Chart
01h 12m 00s
+28° 31’ 41”
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

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 local timezone Europe/London.

Azimuth: 61.5°
Max altitude: 67.0°
Azimuth: 298.5°

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
2018 Aug 11 01h 11m 54s +27° 43’ 40” 16.93 Pisces
2018 Aug 12 01h 11m 59s +27° 50’ 20” 16.94 Pisces
2018 Aug 13 01h 12m 02s +27° 56’ 51” 16.94 Pisces
2018 Aug 14 01h 12m 06s +28° 03’ 15” 16.95 Pisces
2018 Aug 15 01h 12m 06s +28° 09’ 29” 16.95 Pisces
2018 Aug 16 01h 12m 06s +28° 15’ 37” 16.96 Pisces
2018 Aug 17 01h 12m 05s +28° 21’ 35” 16.97 Pisces
2018 Aug 18 01h 12m 02s +28° 27’ 25” 16.97 Pisces
2018 Aug 19 01h 11m 58s +28° 33’ 06” 16.98 Pisces
2018 Aug 20 01h 11m 54s +28° 38’ 39” 16.98 Pisces
2018 Aug 21 01h 11m 48s +28° 44’ 03” 16.99 Pisces
2018 Aug 22 01h 11m 42s +28° 49’ 18” 17.00 Pisces
2018 Aug 23 01h 11m 32s +28° 54’ 24” 17.00 Pisces
2018 Aug 24 01h 11m 23s +28° 59’ 20” 17.01 Pisces

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 2075

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 2075

Comet C/2017 K4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 K4 (ATLAS) at epoch 14 July 2017 00:00 UTC (JD: 2457949.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.90577305
Orbit inclination i 16.67859282°
Perihelion distance q 2.64816607 AU
396,160,006 km
Aphelion distance Q 53.56008337 AU
8,012,474,443 km
Semi-major axis a 28.10412472 AU
4,204,317,225 km
Orbital period period 148.9900 years
54,419.3717 days
Date of perihelion transit Tp 2018-Jan-08 00:17:00
2,458,126.5118 JD
Next perihelion transit 2167-Jan-06 09:12
2,512,545.8835 JD
Argument of perihelion peri 15.100665907487°
Longitude of the ascending node node 298.89892870664°
Mean anomaly M 358.82901531937°
Mean motion n 0.00661529°/day
Closest approach to Earth* 2017-Jul-03
Distance of closest approach* 2.31072141 AU
345,679,003 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.