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Comet C/2017 S3 (PANSTARRS)

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Comet C/2017 S3 (PANSTARRS) Position

Comet C/2017 S3 (PANSTARRS) is currently in the constellation of Ursa Major. The current Right Ascension is 12h 08m 16s and the Declination is +49° 33’ 07”.

12h 08m 16s
+49° 33’ 07”

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 fuillscreen Online Planetarium)

Map showing Comet C/2017 S3 (PANSTARRS) in Ursa Major on August, 21 2019
Field of view: 60x30 degrees
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 = 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/2017 S3 (PANSTARRS) is right now (view fullscreen)

RA: 12h 08m 16s
Dec: +49° 33’ 07”
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 918,098,756 kilometers, equivalent to 6.137111 Astronomical Units. Light takes 51 minutes and 2.4478 seconds to travel from Comet C/2017 S3 (PANSTARRS) and arrive to us.

51 minutes and 2.4478 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 0.75800580 Astronomical Units, or 113,396,054 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 27.58.


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/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 14:09 UTC (altitude: 88.1°)

The rise and set times are defined as the time at which the upper limb of Comet C/2017 S3 (PANSTARRS) 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/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
2019 Aug 14 12h 01m 54s +50° 09’ 38” 27.46 Ursa Major
2019 Aug 15 12h 02m 43s +50° 04’ 40” 27.48 Ursa Major
2019 Aug 16 12h 03m 32s +49° 59’ 45” 27.49 Ursa Major
2019 Aug 17 12h 04m 22s +49° 54’ 56” 27.51 Ursa Major
2019 Aug 18 12h 05m 11s +49° 50’ 09” 27.52 Ursa Major
2019 Aug 19 12h 06m 01s +49° 45’ 28” 27.54 Ursa Major
2019 Aug 20 12h 06m 51s +49° 40’ 50” 27.55 Ursa Major
2019 Aug 21 12h 07m 41s +49° 36’ 17” 27.57 Ursa Major
2019 Aug 22 12h 08m 30s +49° 31’ 50” 27.58 Ursa Major
2019 Aug 23 12h 09m 21s +49° 27’ 24” 27.60 Ursa Major
2019 Aug 24 12h 10m 11s +49° 23’ 05” 27.62 Ursa Major
2019 Aug 25 12h 11m 03s +49° 18’ 50” 27.63 Ursa Major
2019 Aug 26 12h 11m 53s +49° 14’ 39” 27.65 Canes Venatici
2019 Aug 27 12h 12m 45s +49° 10’ 32” 27.66 Canes Venatici