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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 Ursa Major on April, 26 2019
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]
11h 45m 15s
+63° 21’ 06”

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

Comet C/2017 S3 (PANSTARRS) is circumpolar from Greenwich, United Kingdom [change] and transits at 21:26 UTC (altitude: 78.1°)

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
2019 Apr 19 11h 56m 09s +63° 58’ 13” 24.81 Ursa Major
2019 Apr 20 11h 54m 33s +63° 53’ 57” 24.83 Ursa Major
2019 Apr 21 11h 52m 59s +63° 49’ 27” 24.86 Ursa Major
2019 Apr 22 11h 51m 28s +63° 44’ 43” 24.89 Ursa Major
2019 Apr 23 11h 49m 59s +63° 39’ 46” 24.92 Ursa Major
2019 Apr 24 11h 48m 33s +63° 34’ 36” 24.95 Ursa Major
2019 Apr 25 11h 47m 11s +63° 29’ 13” 24.98 Ursa Major
2019 Apr 26 11h 45m 50s +63° 23’ 39” 25.01 Ursa Major
2019 Apr 27 11h 44m 31s +63° 17’ 54” 25.04 Ursa Major
2019 Apr 28 11h 43m 17s +63° 12’ 00” 25.06 Ursa Major
2019 Apr 29 11h 42m 05s +63° 05’ 53” 25.09 Ursa Major
2019 Apr 30 11h 40m 54s +62° 59’ 38” 25.12 Ursa Major
2019 May 01 11h 39m 47s +62° 53’ 12” 25.15 Ursa Major
2019 May 02 11h 38m 43s +62° 46’ 39” 25.18 Ursa Major

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 2100

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 2100

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
Closest approach to Earth* 2018-Aug-07
Distance of closest approach* 0.75800580 AU
113,396,054 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2100-Dec-31, with a sampling interval of 1 day.