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Comet C/2018 A3 (ATLAS)

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Comet C/2018 A3 (ATLAS) Position

Comet C/2018 A3 (ATLAS) is currently in the constellation of Andromeda. The current Right Ascension is 02h 36m 59s and the Declination is +47° 02’ 38”.

02h 36m 59s
+47° 02’ 38”

Simplified sky chart showing where Comet C/2018 A3 (ATLAS) is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet C/2018 A3 (ATLAS) in Andromeda on October, 18 2019
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]

Hihgher precision deep sky finder chart showing where Comet C/2018 A3 (ATLAS) is right now (view fullscreen)

C/2018 A3 (ATLAS)
RA: 02h 36m 59s
Dec: +47° 02’ 38”
Deep sky finder chart for Comet C/2018 A3 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2018 A3 (ATLAS)?, a page that provides all the information needed to find Comet C/2018 A3 (ATLAS) in the sky and additional links to sky charts.

Comet C/2018 A3 (ATLAS) Distance

The distance of Comet C/2018 A3 (ATLAS) from Earth is currently 502,298,468 kilometers, equivalent to 3.357658 Astronomical Units. Light takes 27 minutes and 55.4873 seconds to travel from Comet C/2018 A3 (ATLAS) and arrive to us.

27 minutes and 55.4873 seconds

The following chart shows the distance of Comet C/2018 A3 (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/2018 A3 (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/2018 A3 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2018 A3 (ATLAS) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2018 A3 (ATLAS) to Earth happens on Thu Jan 10 2019 at a distance of 2.60581602 Astronomical Units, or 389,824,528 kilometers:

Thu Jan 10 2019

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

Comet C/2018 A3 (ATLAS) brightness

The current visual magnitude of Comet C/2018 A3 (ATLAS) is 17.51.


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.

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2018 A3 (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/2018 A3 (ATLAS) between January 2013 and December 2100

Comet C/2018 A3 (ATLAS) rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Comet C/2018 A3 (ATLAS) is circumpolar and transits at 00:52 UTC (altitude: 85.6°)

The rise and set times are defined as the time at which the upper limb of Comet C/2018 A3 (ATLAS) touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet C/2018 A3 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2018 A3 (ATLAS) at epoch 26 August 2018 00:00 UTC (JD: 2458357.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99332121
Orbit inclination i 139.56146593°
Perihelion distance q 3.27672920 AU
490,191,712 km
Aphelion distance Q 977.95718528 AU
146,300,312,847 km
Semi-major axis a 490.61695724 AU
73,395,252,280 km
Orbital period period 10,867.3100 years
3,969,284.7802 days
Date of perihelion transit Tp 2019-Jan-12 20:45:31
2,458,496.3649 JD
Next perihelion transit 12886-Jul-25 15:29
6,427,781.1451 JD
Argument of perihelion peri 86.424953054368°
Longitude of the ascending node node 194.27763578158°
Mean anomaly M 359.98740544349°
Mean motion n 0.00009070°/day

Visualization of Comet C/2018 A3 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2018 A3 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2018 A3 (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/2018 A3 (ATLAS)
View Comet C/2018 A3 (ATLAS) in the 3D Solar System Simulator

Comet C/2018 A3 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2018 A3 (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/2018 A3 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Oct 11 02h 53m 20s +48° 11’ 49” 17.49 Perseus
2019 Oct 12 02h 51m 05s +48° 03’ 23” 17.49 Perseus
2019 Oct 13 02h 48m 50s +47° 54’ 33” 17.50 Perseus
2019 Oct 14 02h 46m 33s +47° 45’ 23” 17.50 Perseus
2019 Oct 15 02h 44m 17s +47° 35’ 49” 17.50 Perseus
2019 Oct 16 02h 42m 02s +47° 25’ 54” 17.50 Perseus
2019 Oct 17 02h 39m 45s +47° 15’ 38” 17.51 Perseus
2019 Oct 18 02h 37m 28s +47° 04’ 59” 17.51 Andromeda
2019 Oct 19 02h 35m 12s +46° 53’ 59” 17.51 Andromeda
2019 Oct 20 02h 32m 57s +46° 42’ 38” 17.52 Andromeda
2019 Oct 21 02h 30m 42s +46° 30’ 55” 17.52 Andromeda
2019 Oct 22 02h 28m 27s +46° 18’ 50” 17.52 Andromeda
2019 Oct 23 02h 26m 12s +46° 06’ 24” 17.53 Andromeda
2019 Oct 24 02h 23m 58s +45° 53’ 39” 17.53 Andromeda