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Comet C/2018 W1 (Catalina)

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Comet C/2018 W1 (Catalina) Position

Comet C/2018 W1 (Catalina) is currently in the constellation of Centaurus. The current Right Ascension is 12h 00m 27s and the Declination is -36° 48’ 01”.

12h 00m 27s
-36° 48’ 01”

Simplified sky chart showing where Comet C/2018 W1 (Catalina) is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet C/2018 W1 (Catalina) in Centaurus on August, 21 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 W1 (Catalina) is right now (view fullscreen)

C/2018 W1 (Catalina)
RA: 12h 00m 27s
Dec: -36° 48’ 01”
Deep sky finder chart for Comet C/2018 W1 (Catalina)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2018 W1 (Catalina)?, a page that provides all the information needed to find Comet C/2018 W1 (Catalina) in the sky and additional links to sky charts.

Comet C/2018 W1 (Catalina) Distance

The distance of Comet C/2018 W1 (Catalina) from Earth is currently 345,177,988 kilometers, equivalent to 2.307372 Astronomical Units. Light takes 19 minutes and 11.3898 seconds to travel from Comet C/2018 W1 (Catalina) and arrive to us.

19 minutes and 11.3898 seconds

The following chart shows the distance of Comet C/2018 W1 (Catalina) 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 W1 (Catalina) 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 W1 (Catalina) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2018 W1 (Catalina) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2018 W1 (Catalina) to Earth happens on Tue Dec 11 2018 at a distance of 1.65147190 Astronomical Units, or 247,056,680 kilometers:

Tue Dec 11 2018

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

Comet C/2018 W1 (Catalina) brightness

The current visual magnitude of Comet C/2018 W1 (Catalina) is 18.70.


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 W1 (Catalina), 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 W1 (Catalina) between January 2013 and December 2100

Comet C/2018 W1 (Catalina) rise and set times

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

Today's Comet C/2018 W1 (Catalina) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 126.8°
Max altitude: 1.8°
Azimuth: 233.3°
Comet C/2018 W1 (Catalina) is below the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet C/2018 W1 (Catalina) 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 W1 (Catalina) Orbital Elements

The following table lists the orbital elements of Comet C/2018 W1 (Catalina) at epoch 16 December 2018 00:00 UTC (JD: 2458469.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.93768802
Orbit inclination i 83.27874795°
Perihelion distance q 1.36017553 AU
203,479,363 km
Aphelion distance Q 42.29677834 AU
6,327,507,990 km
Semi-major axis a 21.82847693 AU
3,265,493,677 km
Orbital period period 101.9900 years
37,250.6262 days
Date of perihelion transit Tp 2019-May-11 20:26:27
2,458,615.3517 JD
Next perihelion transit 2121-May-07 11:28
2,495,865.9779 JD
Argument of perihelion peri 251.24771860599°
Longitude of the ascending node node 233.58957567697°
Mean anomaly M 358.59045017646°
Mean motion n 0.00966427°/day

Visualization of Comet C/2018 W1 (Catalina) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2018 W1 (Catalina) with respect of the Sun and the orbits of the major planets. The position of Comet C/2018 W1 (Catalina) 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 W1 (Catalina)
View Comet C/2018 W1 (Catalina) in the 3D Solar System Simulator

Comet C/2018 W1 (Catalina) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2018 W1 (Catalina) 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 W1 (Catalina) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Aug 14 11h 34m 15s -37° 47’ 36” 18.40 Centaurus
2019 Aug 15 11h 38m 03s -37° 39’ 29” 18.45 Centaurus
2019 Aug 16 11h 41m 47s -37° 31’ 18” 18.49 Centaurus
2019 Aug 17 11h 45m 28s -37° 23’ 04” 18.53 Centaurus
2019 Aug 18 11h 49m 05s -37° 14’ 51” 18.57 Centaurus
2019 Aug 19 11h 52m 37s -37° 06’ 35” 18.61 Centaurus
2019 Aug 20 11h 56m 08s -36° 58’ 20” 18.65 Centaurus
2019 Aug 21 11h 59m 35s -36° 50’ 06” 18.69 Centaurus
2019 Aug 22 12h 03m 00s -36° 41’ 52” 18.73 Centaurus
2019 Aug 23 12h 06m 20s -36° 33’ 38” 18.77 Centaurus
2019 Aug 24 12h 09m 38s -36° 25’ 27” 18.81 Centaurus
2019 Aug 25 12h 12m 53s -36° 17’ 18” 18.85 Centaurus
2019 Aug 26 12h 16m 05s -36° 09’ 12” 18.89 Centaurus
2019 Aug 27 12h 19m 14s -36° 01’ 09” 18.93 Centaurus