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Comet C/2015 D4 (Borisov)

Available Resources

Comet C/2015 D4 (Borisov) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2015 D4 (Borisov) 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/2015 D4 (Borisov) in Cepheus on May, 23 2018
High Precision Live Sky Chart
23h 52m 14s
+86° 32’ 31”
32.20
 = 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/2015 D4 (Borisov) Rise and Set Times

Comet C/2015 D4 (Borisov) is circumpolar from Greenwich, United Kingdom [change] and transits at 07:48 UTC (altitude: 54.9°)

Comet C/2015 D4 (Borisov) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2015 D4 (Borisov) with respect of the Sun and the orbits of the major planets. The position of Comet C/2015 D4 (Borisov) 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/2015 D4 (Borisov)
View Comet C/2015 D4 (Borisov) in the 3D Solar System Simulator

Comet C/2015 D4 (Borisov) Ephemeris

The following table lists the ephemerides of Comet C/2015 D4 (Borisov) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2015 D4 (Borisov) in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 May 16 32.16 23h 35m 44s +86° 00’ 20” Cepheus
2018 May 17 32.16 23h 38m 00s +86° 04’ 55” Cepheus
2018 May 18 32.17 23h 40m 18s +86° 09’ 30” Cepheus
2018 May 19 32.17 23h 42m 38s +86° 14’ 07” Cepheus
2018 May 20 32.18 23h 45m 00s +86° 18’ 42” Cepheus
2018 May 21 32.18 23h 47m 22s +86° 23’ 18” Cepheus
2018 May 22 32.19 23h 49m 47s +86° 27’ 55” Cepheus
2018 May 23 32.20 23h 52m 14s +86° 32’ 31” Cepheus
2018 May 24 32.20 23h 54m 42s +86° 37’ 08” Cepheus
2018 May 25 32.21 23h 57m 12s +86° 41’ 44” Cepheus
2018 May 26 32.21 23h 59m 45s +86° 46’ 23” Cepheus
2018 May 27 32.22 00h 02m 21s +86° 50’ 59” Cepheus
2018 May 28 32.22 00h 04m 59s +86° 55’ 36” Cepheus
2018 May 29 32.23 00h 07m 40s +87° 00’ 14” Cepheus

Distance of Comet C/2015 D4 (Borisov) from Earth

The following chart shows the distance of Comet C/2015 D4 (Borisov) 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/2015 D4 (Borisov) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2015 D4 (Borisov) from Earth between January 2013 and December 2075

Light Curve of Comet C/2015 D4 (Borisov)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2015 D4 (Borisov), 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/2015 D4 (Borisov) between January 2013 and December 2075

Comet C/2015 D4 (Borisov) Orbital Elements

The following table lists the orbital elements of Comet C/2015 D4 (Borisov) at epoch 29 March 2015 00:00 UTC (JD: 2457111.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.98906894
Orbit inclination i 77.30173941°
Perihelion distance q 0.86167786 AU
128,905,174 km
Aphelion distance Q 156.79504245 AU
23,456,204,533 km
Semi-major axis a 78.82836015 AU
11,792,554,854 km
Orbital period period 699.8900 years
255,636.0893 days
Date of perihelion transit Tp 2014-Oct-28 05:42:03
2,456,958.7375 JD
Next perihelion transit 2714-Sep-25 07:50
2,712,594.8268 JD
Argument of perihelion peri 314.69429020156°
Longitude of the ascending node node 305.81031552317°
Mean anomaly M 0.21512802062602°
Mean motion n 0.00140825°/day
Closest approach to Earth* 2014-Oct-22
Distance of closest approach* 1.39050711 AU
208,016,903 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.