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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 Ophiucus on September, 22 2017
17h 23m 04s
-28° 09’ 56”
 = 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: 118.2°
Max altitude: 10.4°
Azimuth: 241.8°

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 MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2017 Sep 15 15.62 17h 14m 36s -28° 44’ 11” Ophiucus
2017 Sep 16 15.61 17h 15m 46s -28° 39’ 14” Ophiucus
2017 Sep 17 15.61 17h 16m 56s -28° 34’ 18” Ophiucus
2017 Sep 18 15.61 17h 18m 08s -28° 29’ 23” Ophiucus
2017 Sep 19 15.60 17h 19m 21s -28° 24’ 29” Ophiucus
2017 Sep 20 15.60 17h 20m 35s -28° 19’ 37” Ophiucus
2017 Sep 21 15.60 17h 21m 48s -28° 14’ 45” Ophiucus
2017 Sep 22 15.60 17h 23m 04s -28° 09’ 56” Ophiucus
2017 Sep 23 15.59 17h 24m 20s -28° 05’ 06” Ophiucus
2017 Sep 24 15.59 17h 25m 38s -28° 00’ 16” Ophiucus
2017 Sep 25 15.59 17h 26m 57s -27° 55’ 27” Ophiucus
2017 Sep 26 15.59 17h 28m 17s -27° 50’ 39” Ophiucus
2017 Sep 27 15.58 17h 29m 36s -27° 45’ 52” Ophiucus
2017 Sep 28 15.58 17h 30m 57s -27° 41’ 04” Ophiucus

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.

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 06 June 2017 00:00 UTC (JD: 2457911.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.90563565
Orbit inclination i 16.67775926°
Perihelion distance q 2.64836933 AU
396,190,413 km
Aphelion distance Q 53.48234620 AU
8,000,845,128 km
Semi-major axis a 28.06535776 AU
4,198,517,770 km
Orbital period period 148.6800 years
54,306.8110 days
Date of perihelion transit Tp 2018-Jan-07 23:53:07
2,458,126.4952 JD
Argument of perihelion peri 15.089867771704°
Longitude of the ascending node node 298.90090555823°
Mean anomaly M 358.57479602563°
Mean motion n 0.00662900°/day
Closest approach to Earth* 2017-Jul-03
Distance of closest approach* 2.31067644 AU
345,672,276 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.