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Comet C/2017 S3 (PANSTARRS)

Available Resources

Comet C/2017 S3 (PANSTARRS) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2017 S3 (PANSTARRS) is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Comet C/2017 S3 (PANSTARRS) in Cassiopeia on June, 21 2018
High Precision Live Sky Chart
02h 16m 50s
+59° 09’ 05”
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Comet C/2017 S3 (PANSTARRS) Rise and Set Times

Comet C/2017 S3 (PANSTARRS) is circumpolar from Greenwich, United Kingdom [change] and transits at 08:18 UTC (altitude: 82.3°)

Comet C/2017 S3 (PANSTARRS) Orbit Diagram

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) 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 MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Jun 14 14.60 01h 50m 40s +58° 38’ 47” Cassiopeia
2018 Jun 15 14.53 01h 54m 12s +58° 43’ 41” Cassiopeia
2018 Jun 16 14.46 01h 57m 47s +58° 48’ 26” Cassiopeia
2018 Jun 17 14.39 02h 01m 27s +58° 53’ 00” Cassiopeia
2018 Jun 18 14.31 02h 05m 12s +58° 57’ 23” Perseus
2018 Jun 19 14.24 02h 08m 59s +59° 01’ 32” Perseus
2018 Jun 20 14.16 02h 12m 52s +59° 05’ 26” Perseus
2018 Jun 21 14.08 02h 16m 50s +59° 09’ 05” Cassiopeia
2018 Jun 22 14.00 02h 20m 53s +59° 12’ 27” Cassiopeia
2018 Jun 23 13.92 02h 25m 00s +59° 15’ 29” Cassiopeia
2018 Jun 24 13.83 02h 29m 13s +59° 18’ 11” Cassiopeia
2018 Jun 25 13.75 02h 33m 33s +59° 20’ 31” Cassiopeia
2018 Jun 26 13.66 02h 37m 58s +59° 22’ 27” Cassiopeia
2018 Jun 27 13.57 02h 42m 29s +59° 23’ 57” Cassiopeia

Distance of Comet C/2017 S3 (PANSTARRS) from Earth

The following chart shows the distance of Comet C/2017 S3 (PANSTARRS) from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2017 S3 (PANSTARRS) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2017 S3 (PANSTARRS) from Earth between January 2013 and December 2075

Light Curve of Comet C/2017 S3 (PANSTARRS)

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 2075

Comet C/2017 S3 (PANSTARRS) Orbital Elements

The following table lists the orbital elements of Comet C/2017 S3 (PANSTARRS) at epoch 13 December 2017 00:00 UTC (JD: 2458101.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00007572
Orbit inclination i 99.04174893°
Perihelion distance q 0.20838506 AU
31,173,961 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 22:38:54
2,458,346.4437 JD
Argument of perihelion peri 255.89444774928°
Longitude of the ascending node node 171.02948436626°
Mean anomaly M -0.0016722351490678°
Mean motion n 0.00000683°/day
Closest approach to Earth* 2018-Aug-07
Distance of closest approach* 0.75801518 AU
113,397,457 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2075-Dec-31, with a sampling interval of 1 day.