Comet C/2019 Q4 (Borisov)

EnglishItalianoEspañol Home » Comets » 2I/Borisov (C/2019 Q4) Comet 2I/Borisov (C/2019 Q4) Below the horizon. Never rises today Alt: -53.67° Az: 241.71° Direction: West-South-West

Comet 2I/Borisov (C/2019 Q4) is in the constellation of Ara, at a distance of 6,699,846,620.0 kilometers from Earth. The current Right Ascension is 18h 11m 44s and the Declination is -53° 37’ 23” (apparent coordinates). The estimated magnitude of comet 2I/Borisov (C/2019 Q4), computed using JPL Horizons's data, is 29.46.

Finder Charts

The sky charts below show, at different resolutions, the position of comet 2I/Borisov (C/2019 Q4) in the sky. Click on each chart to access the interactive star map tool.

Loading the finder chart... Star map showing the position of comet 2I/Borisov (C/2019 Q4) in the constellation of Ara on February 13, 2026. Field of view: 50x30 degrees. View interactive star map. Loading the finder chart... Star map showing the position of comet 2I/Borisov (C/2019 Q4) in the constellation of Ara on February 13, 2026. Field of view: 15x9 degrees. View in interactive star map.

The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet 2I/Borisov (C/2019 Q4) against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.

2I/Borisov (C/2019 Q4) RA: 18h 09m 37s Dec: -53° 37’ 48” Simplified high-resolution deep sky chart showing the current position of comet 2I/Borisov (C/2019 Q4). Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

Right Ascension 18h 11m 44s Declination -53° 37’ 23” Hour Angle 07h 53m 34s Sidereal Time 02h 05m 19s

J2000

Right Ascension 18h 09m 37s Declination -53° 37’ 48”

Additional Information

Constellation Ara Observed Magnitude (COBS) n/a Coma Diameter (COBS) n/a Tail Length (COBS) n/a Observation Date (COBS) n/a Predicted Magnitude (JPL) 29.46

The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted 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.

Rise and Set Times

The following table lists today's rise, transit and set times of comet 2I/Borisov (C/2019 Q4) from Greenwich, UK (all times relative to the local timezone Europe/London):

Greenwich, UKToday comet 2I/Borisov (C/2019 Q4) is not visible from

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Distance from Earth

The distance of comet 2I/Borisov (C/2019 Q4) from Earth is currently 6,699,846,620.0 kilometers, equivalent to 44.7857084372 Astronomical Units. Light takes 6h 12m 28.283s to travel from comet 2I/Borisov (C/2019 Q4) and arrive to us.

Distance Km 6,699,846,620.0 Distance AU 44.7857084372 Light Travel Time 6h 12m 28.283s

The following graph shows the distance of comet 2I/Borisov (C/2019 Q4) from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.

Chart of the distance of comet 2I/Borisov (C/2019 Q4) from Earth in Astronomical Units (au) Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).

The value of the distance of 2I/Borisov (C/2019 Q4) from Earth is also available as a real time updated value in the live position tracker.

Closest Approach to Earth

In the period between January 1, 2000 and December 31, 2099, the closest approach of comet 2I/Borisov (C/2019 Q4) to Earth happened on Saturday 28 December 2019 at a distance of 1.936739 Astronomical Units, or 289,732,033 kilometers:

Date Saturday 28 December 2019 Distance Kilometers 289,732,033 Distance AU 1.936739

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

Light Curve

The following chart shows the light curve of comet 2I/Borisov (C/2019 Q4), i.e., its apparent magnitude as a function of time. The curve is calculated using the latest ephemerides provided by JPL Horizons. The magnitude data is sampled with the interval of 2 days. Because of this sampling, inaccuracies may occur for objects that have large variations of brightness over a few days. For comets, large discrepancies can arise between the calculated brightness and the observations due to their highly dynamic, and not always precisely predictable, behavior.

Chart of the magnitude of comet 2I/Borisov (C/2019 Q4) as a function of time

Orbital Elements

The following table lists the orbital elements of comet 2I/Borisov (C/2019 Q4) at epoch January, 04 2020 00:00 UTC (JD: 2458853.5). Source: JPL Small-Body Database

Element	Symbol	Value
Orbit eccentricity	e	3.35647578
Orbit inclination	i	44.05264248°
Perihelion distance	q	2.00652088 AU300,171,252 km
Aphelion distance	Q	n.a.
Semi-major axis	a	n.a.
Orbital period	period	n.a.
Date of perihelion transit	Tp	December 8, 20192,458,826.0528 JD
Argument of perihelion	peri	209.12368643781°
Longitude of the ascending node	node	308.14772922699°
Mean anomaly	M	34.429470307218°
Mean motion	n	1.25439126°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of comet 2I/Borisov (C/2019 Q4) relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.

15 Days Ephemeris

The following table lists the ephemerides of comet 2I/Borisov (C/2019 Q4) computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date	Right AscensionR.A.	DeclinationDec.	MagnitudeMag	Constellation
Feb 06 2026	18h 10m 55s	-53° 33’ 59”	29.45	Ara
Feb 07 2026	18h 11m 02s	-53° 34’ 24”	29.46	Ara
Feb 08 2026	18h 11m 08s	-53° 34’ 50”	29.46	Ara
Feb 09 2026	18h 11m 15s	-53° 35’ 15”	29.46	Ara
Feb 10 2026	18h 11m 21s	-53° 35’ 42”	29.46	Ara
Feb 11 2026	18h 11m 27s	-53° 36’ 09”	29.46	Ara
Feb 12 2026	18h 11m 34s	-53° 36’ 37”	29.46	Ara
Feb 13 2026	18h 11m 40s	-53° 37’ 04”	29.46	Ara
Feb 14 2026	18h 11m 46s	-53° 37’ 32”	29.46	Ara
Feb 15 2026	18h 11m 51s	-53° 38’ 01”	29.47	Ara
Feb 16 2026	18h 11m 57s	-53° 38’ 30”	29.47	Ara
Feb 17 2026	18h 12m 03s	-53° 38’ 59”	29.47	Ara
Feb 18 2026	18h 12m 08s	-53° 39’ 29”	29.47	Ara
Feb 19 2026	18h 12m 13s	-53° 40’ 00”	29.47	Ara

Additional Resources on TheSkyLive

• Comet 2I/Borisov (C/2019 Q4): Complete reference information on TheSkyLive.com.
• Where is comet 2I/Borisov (C/2019 Q4)?: Key information on where to find comet 2I/Borisov (C/2019 Q4) in the sky.
• Distance of comet 2I/Borisov (C/2019 Q4) from Earth: Find out how far comet 2I/Borisov (C/2019 Q4) is from Earth right now.
• How Bright is comet 2I/Borisov (C/2019 Q4)?: Current visual brightness (magnitude) and apparent size.
• Rise and Set Times: Rise and set times of comet 2I/Borisov (C/2019 Q4) from your location.
• Interactive Sky Map: Planetarium-style interactive visualization of comet 2I/Borisov (C/2019 Q4)'s position in the sky.
• Live Position Tracker: High precision real time tracker of comet 2I/Borisov (C/2019 Q4)'s position using deep space imagery.
• Ephemeris: 15 days comet 2I/Borisov (C/2019 Q4)'s computed ephemeris.
• Orbital elements: Information about comet 2I/Borisov (C/2019 Q4) orbital parameters.
• Orbit Visualization: 3D interactive visualization showing the orbit of comet 2I/Borisov (C/2019 Q4) with respect to the major Solar System objects.