Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]
Comets » 

Comet C/2017 S3 (PANSTARRS)

Available Resources

Comet C/2017 S3 (PANSTARRS) Position

Comet C/2017 S3 (PANSTARRS) is currently in the constellation of Draco. The current Right Ascension is 12h 57m 15s and the Declination is +64° 40’ 48”.

12h 57m 15s
+64° 40’ 48”

Simplified sky chart showing where Comet C/2017 S3 (PANSTARRS) is right now in the sky with respect to the brightest stars and constellations (see full screen Online Planetarium)

Map showing Comet C/2017 S3 (PANSTARRS) in Draco on April, 04 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 S3 (PANSTARRS) is right now (view fullscreen)

RA: 12h 57m 15s
Dec: +64° 40’ 48”
Deep sky finder chart for Comet C/2017 S3 (PANSTARRS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2017 S3 (PANSTARRS)?, a page that provides all the information needed to find Comet C/2017 S3 (PANSTARRS) in the sky and additional links to sky charts.

Comet C/2017 S3 (PANSTARRS) Distance

The distance of Comet C/2017 S3 (PANSTARRS) from Earth is currently 1,078,954,433 kilometers, equivalent to 7.212365 Astronomical Units. Light takes 59 minutes and 59.0046 seconds to travel from Comet C/2017 S3 (PANSTARRS) and arrive to us.

59 minutes and 59.0046 seconds

The following chart shows the distance of Comet C/2017 S3 (PANSTARRS) 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 S3 (PANSTARRS) 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 S3 (PANSTARRS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2017 S3 (PANSTARRS) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2017 S3 (PANSTARRS) to Earth happens on Tue Aug 7 2018 at a distance of 0.75800575 Astronomical Units, or 113,396,047 kilometers:

Tue Aug 7 2018

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

Comet C/2017 S3 (PANSTARRS) brightness

The current visual magnitude of Comet C/2017 S3 (PANSTARRS) is 29.93.


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 S3 (PANSTARRS), 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 S3 (PANSTARRS) between January 2013 and December 2100

Comet C/2017 S3 (PANSTARRS) rise and set times

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

Comet C/2017 S3 (PANSTARRS) is circumpolar and transits at 00:06 UTC (altitude: 76.8°)

The rise and set times are defined as the time at which the upper limb of Comet C/2017 S3 (PANSTARRS) 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 S3 (PANSTARRS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 S3 (PANSTARRS) at epoch 27 April 2018 00:00 UTC (JD: 2458236.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00007751
Orbit inclination i 99.03862156°
Perihelion distance q 0.20844567 AU
31,183,029 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2018-Aug-15 22:45:44
2,458,346.4484 JD
Argument of perihelion peri 255.89232457393°
Longitude of the ascending node node 171.04267353551°
Mean anomaly M -0.00077699334925039°
Mean motion n 0.00000707°/day

Visualization of Comet C/2017 S3 (PANSTARRS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 S3 (PANSTARRS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 S3 (PANSTARRS) 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 S3 (PANSTARRS)
View Comet C/2017 S3 (PANSTARRS) in the 3D Solar System Simulator

Comet C/2017 S3 (PANSTARRS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2017 S3 (PANSTARRS) 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 S3 (PANSTARRS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Mar 28 13h 05m 47s +64° 25’ 48” 29.84 Draco
2020 Mar 29 13h 04m 39s +64° 28’ 20” 29.85 Draco
2020 Mar 30 13h 03m 30s +64° 30’ 45” 29.86 Draco
2020 Mar 31 13h 02m 22s +64° 32’ 57” 29.87 Draco
2020 Apr 01 13h 01m 14s +64° 34’ 59” 29.88 Draco
2020 Apr 02 13h 00m 06s +64° 36’ 51” 29.90 Draco
2020 Apr 03 12h 58m 59s +64° 38’ 32” 29.91 Draco
2020 Apr 04 12h 57m 51s +64° 40’ 05” 29.92 Draco
2020 Apr 05 12h 56m 43s +64° 41’ 26” 29.93 Draco
2020 Apr 06 12h 55m 35s +64° 42’ 37” 29.94 Draco
2020 Apr 07 12h 54m 28s +64° 43’ 37” 29.95 Draco
2020 Apr 08 12h 53m 21s +64° 44’ 29” 29.96 Draco
2020 Apr 09 12h 52m 14s +64° 45’ 10” 29.98 Draco
2020 Apr 10 12h 51m 07s +64° 45’ 41” 29.99 Draco