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Comet C/2013 A1 (Siding Spring)

Available Resources

Comet C/2013 A1 (Siding Spring) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2013 A1 (Siding Spring) 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/2013 A1 (Siding Spring) in Ursa Major on April, 19 2018
High Precision Live Sky Chart
10h 27m 29s
+41° 48’ 44”
23.37
 = 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/2013 A1 (Siding Spring) Rise and Set Times

Comet C/2013 A1 (Siding Spring) is circumpolar from Greenwich, United Kingdom [change] and transits at 20:35 UTC (altitude: 80.3°)

Comet C/2013 A1 (Siding Spring) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2013 A1 (Siding Spring) with respect of the Sun and the orbits of the major planets. The position of Comet C/2013 A1 (Siding Spring) 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/2013 A1 (Siding Spring)
View Comet C/2013 A1 (Siding Spring) in the 3D Solar System Simulator

Comet C/2013 A1 (Siding Spring) Ephemeris

The following table lists the ephemerides of Comet C/2013 A1 (Siding Spring) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2013 A1 (Siding Spring) in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Apr 12 23.33 10h 29m 52s +41° 58’ 45” Ursa Major
2018 Apr 13 23.33 10h 29m 30s +41° 57’ 29” Ursa Major
2018 Apr 14 23.34 10h 29m 08s +41° 56’ 09” Ursa Major
2018 Apr 15 23.34 10h 28m 49s +41° 54’ 47” Ursa Major
2018 Apr 16 23.35 10h 28m 27s +41° 53’ 21” Ursa Major
2018 Apr 17 23.36 10h 28m 08s +41° 51’ 51” Ursa Major
2018 Apr 18 23.36 10h 27m 48s +41° 50’ 20” Ursa Major
2018 Apr 19 23.37 10h 27m 29s +41° 48’ 44” Ursa Major
2018 Apr 20 23.37 10h 27m 11s +41° 47’ 07” Ursa Major
2018 Apr 21 23.38 10h 26m 53s +41° 45’ 27” Ursa Major
2018 Apr 22 23.39 10h 26m 35s +41° 43’ 42” Ursa Major
2018 Apr 23 23.39 10h 26m 17s +41° 41’ 57” Ursa Major
2018 Apr 24 23.40 10h 26m 00s +41° 40’ 08” Ursa Major
2018 Apr 25 23.41 10h 25m 45s +41° 38’ 17” Ursa Major

Distance of Comet C/2013 A1 (Siding Spring) from Earth

The following chart shows the distance of Comet C/2013 A1 (Siding Spring) 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/2013 A1 (Siding Spring) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2013 A1 (Siding Spring) from Earth between January 2013 and December 2075

Light Curve of Comet C/2013 A1 (Siding Spring)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2013 A1 (Siding Spring), 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/2013 A1 (Siding Spring) between January 2013 and December 2075

Comet C/2013 A1 (Siding Spring) Orbital Elements

The following table lists the orbital elements of Comet C/2013 A1 (Siding Spring) at epoch 01 April 2016 00:00 UTC (JD: 2457480.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00008553
Orbit inclination i 129.03291761°
Perihelion distance q 1.39976499 AU
209,401,862 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2014-Oct-25 04:13:10
2,456,955.6758 JD
Argument of perihelion peri 2.4491694821387°
Longitude of the ascending node node 300.99940992437°
Mean anomaly M 0.00024704994536109°
Mean motion n 0.00000047°/day
Closest approach to Earth* 2014-Sep-05
Distance of closest approach* 0.89102368 AU
133,295,246 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.