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Comet C/2017 T3 (ATLAS)

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Comet C/2017 T3 (ATLAS) Position

Comet C/2017 T3 (ATLAS) is currently in the constellation of Serpens. The current Right Ascension is 16h 08m 31s and the Declination is +09° 52’ 45”.

16h 08m 31s
+09° 52’ 45”

Simplified sky chart showing where Comet C/2017 T3 (ATLAS) is right now in the sky with respect to the brightest stars and constellations (see full screen Online Planetarium)

Map showing Comet C/2017 T3 (ATLAS) in Serpens on March, 29 2020
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]

Higher precision deep sky finder chart showing where Comet C/2017 T3 (ATLAS) is right now (view fullscreen)

C/2017 T3 (ATLAS)
RA: 16h 08m 31s
Dec: +09° 52’ 45”
Deep sky finder chart for Comet C/2017 T3 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2017 T3 (ATLAS)?, a page that provides all the information needed to find Comet C/2017 T3 (ATLAS) in the sky and additional links to sky charts.

Comet C/2017 T3 (ATLAS) Distance

The distance of Comet C/2017 T3 (ATLAS) from Earth is currently 993,526,821 kilometers, equivalent to 6.641317 Astronomical Units. Light takes 55 minutes and 14.0488 seconds to travel from Comet C/2017 T3 (ATLAS) and arrive to us.

55 minutes and 14.0488 seconds

The following chart shows the distance of Comet C/2017 T3 (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/2017 T3 (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/2017 T3 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2017 T3 (ATLAS) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2017 T3 (ATLAS) to Earth happens on Wed Aug 1 2018 at a distance of 1.35138252 Astronomical Units, or 202,163,947 kilometers:

Wed Aug 1 2018

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

Comet C/2017 T3 (ATLAS) brightness

The current visual magnitude of Comet C/2017 T3 (ATLAS) is 21.34.


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/2017 T3 (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/2017 T3 (ATLAS) between January 2013 and December 2100

Comet C/2017 T3 (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/2017 T3 (ATLAS) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 80.1°
Max altitude: 48.4°
Azimuth: 279.9°
Comet C/2017 T3 (ATLAS) 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/2017 T3 (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/2017 T3 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 T3 (ATLAS) at epoch 25 December 2017 00:00 UTC (JD: 2458113.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99938587
Orbit inclination i 88.10722174°
Perihelion distance q 0.82522071 AU
123,451,261 km
Aphelion distance Q 2,686.60978513 AU
401,911,104,063 km
Semi-major axis a 1,343.71750292 AU
201,017,277,662 km
Orbital period period 49,257.2500 years
17,991,210.6360 days
Date of perihelion transit Tp 2018-Jul-19 03:33:36
2,458,318.6483 JD
Next perihelion transit 51276-Oct-21 18:49
20,449,529.2844 JD
Argument of perihelion peri 246.89365958767°
Longitude of the ascending node node 230.0867314144°
Mean anomaly M 359.99589502885°
Mean motion n 0.00002001°/day

Visualization of Comet C/2017 T3 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 T3 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 T3 (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/2017 T3 (ATLAS)
View Comet C/2017 T3 (ATLAS) in the 3D Solar System Simulator

Comet C/2017 T3 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2017 T3 (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/2017 T3 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Mar 22 16h 10m 46s +09° 06’ 51” 21.32 Serpens
2020 Mar 23 16h 10m 31s +09° 12’ 56” 21.32 Serpens
2020 Mar 24 16h 10m 14s +09° 19’ 01” 21.32 Serpens
2020 Mar 25 16h 09m 56s +09° 25’ 05” 21.32 Serpens
2020 Mar 26 16h 09m 38s +09° 31’ 09” 21.33 Serpens
2020 Mar 27 16h 09m 20s +09° 37’ 11” 21.33 Serpens
2020 Mar 28 16h 09m 02s +09° 43’ 14” 21.33 Serpens
2020 Mar 29 16h 08m 43s +09° 49’ 14” 21.34 Serpens
2020 Mar 30 16h 08m 22s +09° 55’ 14” 21.34 Serpens
2020 Mar 31 16h 08m 03s +10° 01’ 11” 21.34 Serpens
2020 Apr 01 16h 07m 41s +10° 07’ 08” 21.34 Serpens
2020 Apr 02 16h 07m 19s +10° 13’ 02” 21.35 Serpens
2020 Apr 03 16h 06m 57s +10° 18’ 56” 21.35 Serpens
2020 Apr 04 16h 06m 35s +10° 24’ 47” 21.35 Serpens