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Comet C/2019 J1 (Lemmon)

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Comet C/2019 J1 (Lemmon) Position

Comet C/2019 J1 (Lemmon) is currently in the constellation of Sagittarius. The current Right Ascension is 20h 09m 52s and the Declination is -39° 20’ 12”.

20h 09m 52s
-39° 20’ 12”

Simplified sky chart showing where Comet C/2019 J1 (Lemmon) is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet C/2019 J1 (Lemmon) in Sagittarius on September, 15 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 J1 (Lemmon) is right now (view fullscreen)

C/2019 J1
RA: 20h 09m 52s
Dec: -39° 20’ 12”
Deep sky finder chart for Comet C/2019 J1 (Lemmon)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2019 J1 (Lemmon)?, a page that provides all the information needed to find Comet C/2019 J1 (Lemmon) in the sky and additional links to sky charts.

Comet C/2019 J1 (Lemmon) Distance

The distance of Comet C/2019 J1 (Lemmon) from Earth is currently 349,836,759 kilometers, equivalent to 2.338514 Astronomical Units. Light takes 19 minutes and 26.9298 seconds to travel from Comet C/2019 J1 (Lemmon) and arrive to us.

19 minutes and 26.9298 seconds

The following chart shows the distance of Comet C/2019 J1 (Lemmon) 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 J1 (Lemmon) 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 J1 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2019 J1 (Lemmon) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2019 J1 (Lemmon) to Earth happens on Wed Jul 3 2019 at a distance of 1.67221258 Astronomical Units, or 250,159,442 kilometers:

Wed Jul 3 2019

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

Comet C/2019 J1 (Lemmon) brightness

The current visual magnitude of Comet C/2019 J1 (Lemmon) is 19.36.


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 J1 (Lemmon), 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 J1 (Lemmon) between January 2013 and December 2100

Comet C/2019 J1 (Lemmon) rise and set times

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

Comet C/2019 J1 (Lemmon) is currently not visible from Greenwich, United Kingdom [change]

The rise and set times are defined as the time at which the upper limb of Comet C/2019 J1 (Lemmon) 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 J1 (Lemmon) Orbital Elements

The following table lists the orbital elements of Comet C/2019 J1 (Lemmon) at epoch 24 May 2019 00:00 UTC (JD: 2458628.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.96547665
Orbit inclination i 24.54998800°
Perihelion distance q 2.47872528 AU
370,812,025 km
Aphelion distance Q 141.11832508 AU
21,111,000,991 km
Semi-major axis a 71.79852518 AU
10,740,906,508 km
Orbital period period 608.3900 years
222,214.1509 days
Date of perihelion transit Tp 2019-Apr-09 08:25:12
2,458,582.8508 JD
Next perihelion transit 2627-Sep-03 12:02
2,680,797.0018 JD
Argument of perihelion peri 167.79815918518°
Longitude of the ascending node node 98.087331129406°
Mean anomaly M 0.073954317728546°
Mean motion n 0.00162006°/day

Visualization of Comet C/2019 J1 (Lemmon) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2019 J1 (Lemmon) with respect of the Sun and the orbits of the major planets. The position of Comet C/2019 J1 (Lemmon) 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 J1 (Lemmon)
View Comet C/2019 J1 (Lemmon) in the 3D Solar System Simulator

Comet C/2019 J1 (Lemmon) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2019 J1 (Lemmon) 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 J1 (Lemmon) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Sep 08 20h 07m 13s -39° 19’ 23” 19.17 Sagittarius
2019 Sep 09 20h 07m 29s -39° 20’ 02” 19.20 Sagittarius
2019 Sep 10 20h 07m 47s -39° 20’ 30” 19.22 Sagittarius
2019 Sep 11 20h 08m 07s -39° 20’ 48” 19.25 Sagittarius
2019 Sep 12 20h 08m 27s -39° 20’ 57” 19.27 Sagittarius
2019 Sep 13 20h 08m 49s -39° 20’ 57” 19.29 Sagittarius
2019 Sep 14 20h 09m 12s -39° 20’ 47” 19.32 Sagittarius
2019 Sep 15 20h 09m 38s -39° 20’ 26” 19.34 Sagittarius
2019 Sep 16 20h 10m 04s -39° 19’ 59” 19.37 Sagittarius
2019 Sep 17 20h 10m 31s -39° 19’ 22” 19.39 Sagittarius
2019 Sep 18 20h 10m 59s -39° 18’ 36” 19.42 Sagittarius
2019 Sep 19 20h 11m 29s -39° 17’ 40” 19.44 Sagittarius
2019 Sep 20 20h 11m 58s -39° 16’ 39” 19.47 Sagittarius
2019 Sep 21 20h 12m 30s -39° 15’ 28” 19.49 Sagittarius