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Comet C/2019 T4 (ATLAS)

Comet C/2019 T4 (ATLAS) is currently in the constellation of Puppis. The current Right Ascension of Comet C/2019 T4 (ATLAS) is 08h 21m 29s and the Declination is -26° 56’ 59” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2019 T4 (ATLAS) is 15.52 (JPL) while the latest observed magnitude is 14.5 (COBS).

Summary of key facts about Comet C/2019 T4 (ATLAS) [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

08h 21m 29s
-26° 56’ 59”

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Additional information about Comet C/2019 T4 (ATLAS) available on TheSkyLive:

Available Resources

Comet C/2019 T4 (ATLAS) Position and Finder Charts

Below we provide Comet C/2019 T4 (ATLAS) finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Comet C/2019 T4 (ATLAS) in Puppis on May, 17 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2019 T4 (ATLAS) in Puppis on May, 17 2021
Field of view: 10x6 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]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2019 T4 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2019 T4 (ATLAS)
RA: 08h 21m 29s
Dec: -26° 56’ 59”
Deep sky finder chart for Comet C/2019 T4 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2019 T4 (ATLAS)?, a page that provides all the information needed to find Comet C/2019 T4 (ATLAS) in the sky and additional links to sky charts.

Comet C/2019 T4 (ATLAS) Distance from Earth

The distance of Comet C/2019 T4 (ATLAS) from Earth is currently 796,101,601 kilometers, equivalent to 5.321611 Astronomical Units. Light takes 44 minutes and 15.5091 seconds to travel from Comet C/2019 T4 (ATLAS) and arrive to us.

44 minutes and 15.5091 seconds

The following chart shows the distance of Comet C/2019 T4 (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/2019 T4 (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/2019 T4 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2019 T4 (ATLAS) to Earth

Between January 2013 and December 2100, the closest approach of Comet C/2019 T4 (ATLAS) to Earth happens on Tue Apr 5 2022 at a distance of 3.330913 Astronomical Units, or 498,297,514 kilometers:

Tue Apr 5 2022

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

Comet C/2019 T4 (ATLAS) brightness

The current visual magnitude of Comet C/2019 T4 (ATLAS) is 15.52.


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 behavior 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/2019 T4 (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/2019 T4 (ATLAS) between January 2013 and December 2100

Comet C/2019 T4 (ATLAS) 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/2019 T4 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 117.0°
Max altitude: 11.6°
Azimuth: 243.0°

The rise and set times are defined as the time at which the upper limb of Comet C/2019 T4 (ATLAS) touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet C/2019 T4 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2019 T4 (ATLAS) at epoch 20 June 2020 00:00 UTC (JD: 2459021.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99598481
Orbit inclination i 53.61631756°
Perihelion distance q 4.24137723 AU
634,501,003 km
Aphelion distance Q 2,108.42640802 AU
315,416,101,800 km
Semi-major axis a 1,056.33389262 AU
158,025,301,402 km
Orbital period period 34,332.8600 years
12,540,078.3075 days
Date of perihelion transit Tp 2022-Jun-09 06:24:17
2,459,739.7669 JD
Argument of perihelion peri 351.2142663144°
Longitude of the ascending node node 199.97037088762°
Mean anomaly M 359.97938002737°
Mean motion n 0.00002871°/day

Visualization of Comet C/2019 T4 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2019 T4 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2019 T4 (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/2019 T4 (ATLAS)
View Comet C/2019 T4 (ATLAS) in the 3D Solar System Simulator

Comet C/2019 T4 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2019 T4 (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/2019 T4 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 May 10 08h 16m 05s -27° 56’ 13” 15.53 Puppis
2021 May 11 08h 16m 45s -27° 48’ 24” 15.52 Puppis
2021 May 12 08h 17m 23s -27° 40’ 40” 15.52 Puppis
2021 May 13 08h 18m 05s -27° 33’ 00” 15.52 Puppis
2021 May 14 08h 18m 46s -27° 25’ 24” 15.52 Puppis
2021 May 15 08h 19m 27s -27° 17’ 53” 15.52 Puppis
2021 May 16 08h 20m 09s -27° 10’ 28” 15.52 Puppis
2021 May 17 08h 20m 52s -27° 03’ 07” 15.52 Puppis
2021 May 18 08h 21m 35s -26° 55’ 51” 15.52 Puppis
2021 May 19 08h 22m 19s -26° 48’ 41” 15.52 Puppis
2021 May 20 08h 23m 03s -26° 41’ 35” 15.52 Puppis
2021 May 21 08h 23m 48s -26° 34’ 35” 15.52 Puppis
2021 May 22 08h 24m 33s -26° 27’ 38” 15.52 Puppis
2021 May 23 08h 25m 19s -26° 20’ 48” 15.52 Puppis