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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 Canes Venatici on December, 12 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
13h 51m 38s
+30° 43’ 45”

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.

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

Today's Comet C/2017 S3 (PANSTARRS) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 59.1°
Max altitude: 69.2°
Azimuth: 300.8°

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 Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Dec 05 13h 44m 27s +28° 32’ 36” 18.55 Canes Venatici
2018 Dec 06 13h 45m 28s +28° 49’ 18” 18.57 Canes Venatici
2018 Dec 07 13h 46m 27s +29° 06’ 12” 18.59 Canes Venatici
2018 Dec 08 13h 47m 25s +29° 23’ 18” 18.62 Canes Venatici
2018 Dec 09 13h 48m 21s +29° 40’ 36” 18.64 Canes Venatici
2018 Dec 10 13h 49m 18s +29° 58’ 06” 18.66 Canes Venatici
2018 Dec 11 13h 50m 13s +30° 15’ 50” 18.69 Canes Venatici
2018 Dec 12 13h 51m 08s +30° 33’ 44” 18.71 Canes Venatici
2018 Dec 13 13h 52m 01s +30° 51’ 51” 18.73 Canes Venatici
2018 Dec 14 13h 52m 54s +31° 10’ 09” 18.75 Canes Venatici
2018 Dec 15 13h 53m 45s +31° 28’ 41” 18.77 Canes Venatici
2018 Dec 16 13h 54m 36s +31° 47’ 25” 18.79 Canes Venatici
2018 Dec 17 13h 55m 26s +32° 06’ 20” 18.82 Canes Venatici
2018 Dec 18 13h 56m 13s +32° 25’ 27” 18.84 Canes Venatici

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 17 July 2018 00:00 UTC (JD: 2458317.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00476984
Orbit inclination i 99.10073167°
Perihelion distance q 0.20826281 AU
31,155,673 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 21:30:44
2,458,346.3963 JD
Argument of perihelion peri 255.67326347251°
Longitude of the ascending node node 171.20150207°
Mean anomaly M -0.098715607027751°
Mean motion n 0.00341620°/day
Closest approach to Earth* 2018-Aug-07
Distance of closest approach* 0.75936402 AU
113,599,241 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.