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Comet C/2018 A3 (ATLAS)

Available Resources

Comet C/2018 A3 (ATLAS) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2018 A3 (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/2018 A3 (ATLAS) in Camelopardalis on February, 23 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]
03h 59m 32s
+66° 16’ 23”

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/2018 A3 (ATLAS) Rise and Set Times

Comet C/2018 A3 (ATLAS) is circumpolar from Greenwich, United Kingdom [change] and transits at 17:46 UTC (altitude: 75.2°)

Comet C/2018 A3 (ATLAS) Orbit Diagram

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) 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 Feb 16 04h 16m 14s +69° 07’ 24” 15.45 Camelopardalis
2019 Feb 17 04h 13m 23s +68° 43’ 22” 15.47 Camelopardalis
2019 Feb 18 04h 10m 45s +68° 19’ 24” 15.48 Camelopardalis
2019 Feb 19 04h 08m 17s +67° 55’ 36” 15.49 Camelopardalis
2019 Feb 20 04h 05m 58s +67° 31’ 54” 15.51 Camelopardalis
2019 Feb 21 04h 03m 50s +67° 08’ 25” 15.52 Camelopardalis
2019 Feb 22 04h 01m 50s +66° 45’ 06” 15.53 Camelopardalis
2019 Feb 23 03h 59m 57s +66° 22’ 01” 15.55 Camelopardalis
2019 Feb 24 03h 58m 14s +65° 59’ 09” 15.56 Camelopardalis
2019 Feb 25 03h 56m 38s +65° 36’ 32” 15.58 Camelopardalis
2019 Feb 26 03h 55m 08s +65° 14’ 09” 15.59 Camelopardalis
2019 Feb 27 03h 53m 44s +64° 52’ 04” 15.60 Camelopardalis
2019 Feb 28 03h 52m 27s +64° 30’ 15” 15.62 Camelopardalis
2019 Mar 01 03h 51m 15s +64° 08’ 43” 15.63 Camelopardalis

Distance of Comet C/2018 A3 (ATLAS) from Earth

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

Distance of Comet C/2018 A3 (ATLAS) from Earth between January 2013 and December 2100

Light Curve of Comet C/2018 A3 (ATLAS)

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) Orbital Elements

The following table lists the orbital elements of Comet C/2018 A3 (ATLAS) at epoch 31 March 2018 00:00 UTC (JD: 2458209.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99315025
Orbit inclination i 139.56112697°
Perihelion distance q 3.27696919 AU
490,227,614 km
Aphelion distance Q 953.53735437 AU
142,647,158,133 km
Semi-major axis a 478.40716178 AU
71,568,692,874 km
Orbital period period 10,464.1700 years
3,822,037.4270 days
Date of perihelion transit Tp 2019-Jan-12 20:32:11
2,458,496.3557 JD
Next perihelion transit 12483-Jun-01 06:47
6,280,533.7827 JD
Argument of perihelion peri 86.417792498025°
Longitude of the ascending node node 194.27684857019°
Mean anomaly M 359.97298089071°
Mean motion n 0.00009419°/day
Closest approach to Earth* 2019-Jan-10
Distance of closest approach* 2.60588491 AU
389,834,835 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.