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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 Leo. The current Right Ascension is 11h 00m 01s and the Declination is -05° 53’ 39”.

11h 00m 01s
-05° 53’ 39”

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 Leo on November, 21 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: 11h 00m 01s
Dec: -05° 53’ 39”
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 319,708,554 kilometers, equivalent to 2.137120 Astronomical Units. Light takes 17 minutes and 46.4329 seconds to travel from Comet C/2019 Q4 (Borisov) and arrive to us.

17 minutes and 46.4329 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 December 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 December 2100 the closest approach of Comet C/2019 Q4 (Borisov) to Earth happens on Sat Dec 28 2019 at a distance of 1.93691730 Astronomical Units, or 289,758,704 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 16.44.


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 December 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: 95.3°
Max altitude: 33.1°
Azimuth: 264.4°
Comet C/2019 Q4 (Borisov) is below 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 24 September 2019 00:00 UTC (JD: 2458751.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 3.35661534
Orbit inclination i 44.05126538°
Perihelion distance q 2.00656858 AU
300,178,387 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2019-Dec-08 13:20:06
2,458,826.0556 JD
Argument of perihelion peri 209.12463061951°
Longitude of the ascending node node 308.14838260383°
Mean anomaly M -93.526909844581°
Mean motion n 1.25445796°/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 Nov 14 10h 46m 09s -00° 22’ 21” 16.58 Sextans
2019 Nov 15 10h 47m 53s -01° 02’ 53” 16.56 Sextans
2019 Nov 16 10h 49m 39s -01° 43’ 47” 16.54 Sextans
2019 Nov 17 10h 51m 24s -02° 25’ 02” 16.52 Leo
2019 Nov 18 10h 53m 09s -03° 06’ 38” 16.51 Leo
2019 Nov 19 10h 54m 53s -03° 48’ 33” 16.49 Leo
2019 Nov 20 10h 56m 39s -04° 30’ 47” 16.47 Leo
2019 Nov 21 10h 58m 23s -05° 13’ 19” 16.46 Leo
2019 Nov 22 11h 00m 07s -05° 56’ 09” 16.44 Leo
2019 Nov 23 11h 01m 51s -06° 39’ 19” 16.43 Leo
2019 Nov 24 11h 03m 34s -07° 22’ 45” 16.41 Crater
2019 Nov 25 11h 05m 18s -08° 06’ 26” 16.40 Crater
2019 Nov 26 11h 07m 01s -08° 50’ 23” 16.39 Crater
2019 Nov 27 11h 08m 45s -09° 34’ 36” 16.37 Crater