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Comet C/2018 O1 (ATLAS)

Available Resources

Comet C/2018 O1 (ATLAS) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2018 O1 (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 O1 (ATLAS) in Centaurus on March, 25 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]
12h 30m 38s
-42° 03’ 08”

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 O1 (ATLAS) Rise and Set Times

Comet C/2018 O1 (ATLAS) is currently not visible from Greenwich, United Kingdom [change]

Comet C/2018 O1 (ATLAS) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2018 O1 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2018 O1 (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 O1 (ATLAS)
View Comet C/2018 O1 (ATLAS) in the 3D Solar System Simulator

Comet C/2018 O1 (ATLAS) Ephemeris

The following table lists the ephemerides of Comet C/2018 O1 (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 O1 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Mar 18 12h 58m 45s -43° 30’ 28” 29.52 Centaurus
2019 Mar 19 12h 54m 56s -43° 21’ 14” 29.56 Centaurus
2019 Mar 20 12h 51m 06s -43° 11’ 12” 29.61 Centaurus
2019 Mar 21 12h 47m 18s -43° 00’ 24” 29.66 Centaurus
2019 Mar 22 12h 43m 32s -42° 48’ 50” 29.71 Centaurus
2019 Mar 23 12h 39m 44s -42° 36’ 29” 29.75 Centaurus
2019 Mar 24 12h 36m 01s -42° 23’ 25” 29.80 Centaurus
2019 Mar 25 12h 32m 17s -42° 09’ 37” 29.85 Centaurus
2019 Mar 26 12h 28m 36s -41° 55’ 05” 29.90 Centaurus
2019 Mar 27 12h 24m 57s -41° 39’ 53” 29.95 Centaurus
2019 Mar 28 12h 21m 21s -41° 24’ 02” 30.00 Centaurus
2019 Mar 29 12h 17m 48s -41° 07’ 32” 30.05 Centaurus
2019 Mar 30 12h 14m 17s -40° 50’ 26” 30.10 Centaurus
2019 Mar 31 12h 10m 50s -40° 32’ 44” 30.15 Centaurus

Distance of Comet C/2018 O1 (ATLAS) from Earth

The following chart shows the distance of Comet C/2018 O1 (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 O1 (ATLAS) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2018 O1 (ATLAS) from Earth between January 2013 and December 2100

Light Curve of Comet C/2018 O1 (ATLAS)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2018 O1 (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 O1 (ATLAS) between January 2013 and December 2100

Comet C/2018 O1 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2018 O1 (ATLAS) at epoch 02 August 2018 00:00 UTC (JD: 2458333.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.94409953
Orbit inclination i 154.04105181°
Perihelion distance q 1.55817463 AU
233,099,607 km
Aphelion distance Q 54.18999715 AU
8,106,708,204 km
Semi-major axis a 27.87408589 AU
4,169,903,905 km
Orbital period period 147.1700 years
53,752.5879 days
Date of perihelion transit Tp 2018-Aug-31 13:40:46
2,458,362.0700 JD
Next perihelion transit 2165-Nov-01 03:47
2,512,114.6579 JD
Argument of perihelion peri 162.50272871808°
Longitude of the ascending node node 87.618981730448°
Mean anomaly M 359.80865673721°
Mean motion n 0.00669735°/day
Closest approach to Earth* 2018-Aug-01
Distance of closest approach* 0.70144522 AU
104,934,711 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.