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Comet C/2019 Q4 (Borisov)

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Comet C/2019 Q4 (Borisov) Position

Comet C/2019 Q4 (Borisov) is currently in the constellation of Cancer. The current Right Ascension is 08h 59m 46s and the Declination is +28° 24’ 12”.

08h 59m 46s
+28° 24’ 12”

Simplified sky chart showing where Comet C/2019 Q4 (Borisov) is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet C/2019 Q4 (Borisov) in Cancer on September, 16 2019
Field of view: 60x30 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Hihgher precision deep sky finder chart showing where Comet C/2019 Q4 (Borisov) is right now (view fullscreen)

C/2019 Q4
RA: 08h 59m 46s
Dec: +28° 24’ 12”
Deep sky finder chart for Comet C/2019 Q4 (Borisov)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2019 Q4 (Borisov)?, a page that provides all the information needed to find Comet C/2019 Q4 (Borisov) in the sky and additional links to sky charts.

Comet C/2019 Q4 (Borisov) Distance

The distance of Comet C/2019 Q4 (Borisov) from Earth is currently 503,118,054 kilometers, equivalent to 3.363136 Astronomical Units. Light takes 27 minutes and 58.2212 seconds to travel from Comet C/2019 Q4 (Borisov) and arrive to us.

27 minutes and 58.2212 seconds

The following chart shows the distance of Comet C/2019 Q4 (Borisov) from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Distance of Comet C/2019 Q4 (Borisov) from Earth between January 2013 and January 2100

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2019 Q4 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2019 Q4 (Borisov) to Earth

Between January 2013 and January 2100 the closest approach of Comet C/2019 Q4 (Borisov) to Earth happens on Sat Dec 28 2019 at a distance of 1.97566502 Astronomical Units, or 295,555,281 kilometers:

Sat Dec 28 2019

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Comet C/2019 Q4 (Borisov) brightness

The current visual magnitude of Comet C/2019 Q4 (Borisov) is 17.76.


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.

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2019 Q4 (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/2019 Q4 (Borisov) between January 2013 and January 2100

Comet C/2019 Q4 (Borisov) rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Comet C/2019 Q4 (Borisov) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 61.4°
Max altitude: 67.0°
Azimuth: 298.4°
Comet C/2019 Q4 (Borisov) is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet C/2019 Q4 (Borisov) touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet C/2019 Q4 (Borisov) Orbital Elements

The following table lists the orbital elements of Comet C/2019 Q4 (Borisov) at epoch 08 September 2019 00:00 UTC (JD: 2458735.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 3.52161649
Orbit inclination i 43.71125318°
Perihelion distance q 2.04446466 AU
305,847,561 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2019-Dec-07 15:09:17
2,458,825.1314 JD
Argument of perihelion peri 208.27431550257°
Longitude of the ascending node node 308.4839234141°
Mean anomaly M -121.00787439302°
Mean motion n 1.35006045°/day

Visualization of Comet C/2019 Q4 (Borisov) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2019 Q4 (Borisov) with respect of the Sun and the orbits of the major planets. The position of Comet C/2019 Q4 (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/2019 Q4 (Borisov)
View Comet C/2019 Q4 (Borisov) in the 3D Solar System Simulator

Comet C/2019 Q4 (Borisov) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2019 Q4 (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/2019 Q4 (Borisov) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Sep 09 08h 45m 18s +30° 51’ 15” 18.07 Cancer
2019 Sep 10 08h 47m 09s +30° 33’ 02” 18.03 Cancer
2019 Sep 11 08h 49m 03s +30° 14’ 35” 17.99 Cancer
2019 Sep 12 08h 50m 54s +29° 55’ 54” 17.95 Cancer
2019 Sep 13 08h 52m 48s +29° 36’ 59” 17.91 Cancer
2019 Sep 14 08h 54m 39s +29° 17’ 47” 17.87 Cancer
2019 Sep 15 08h 56m 33s +28° 58’ 19” 17.83 Cancer
2019 Sep 16 08h 58m 24s +28° 38’ 38” 17.79 Cancer
2019 Sep 17 09h 00m 16s +28° 18’ 39” 17.75 Cancer
2019 Sep 18 09h 02m 08s +27° 58’ 24” 17.71 Cancer
2019 Sep 19 09h 04m 01s +27° 37’ 54” 17.67 Cancer
2019 Sep 20 09h 05m 53s +27° 17’ 08” 17.63 Cancer
2019 Sep 21 09h 07m 45s +26° 56’ 04” 17.59 Cancer
2019 Sep 22 09h 09m 38s +26° 34’ 45” 17.55 Cancer