Your guide to the Solar System
🌎 Location: Greenwich, United Kingdom [change]
Comets » 

Comet C/2018 R3 (Lemmon)

Available Resources

Comet C/2018 R3 (Lemmon) Position

Comet C/2018 R3 (Lemmon) is currently in the constellation of Leo. The current Right Ascension is 09h 55m 40s and the Declination is +16° 57’ 29”.

09h 55m 40s
+16° 57’ 29”

Simplified sky chart showing where Comet C/2018 R3 (Lemmon) is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet C/2018 R3 (Lemmon) in Leo on August, 23 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/2018 R3 (Lemmon) is right now (view fullscreen)

C/2018 R3 (Lemmon)
RA: 09h 55m 40s
Dec: +16° 57’ 29”
Deep sky finder chart for Comet C/2018 R3 (Lemmon)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2018 R3 (Lemmon)?, a page that provides all the information needed to find Comet C/2018 R3 (Lemmon) in the sky and additional links to sky charts.

Comet C/2018 R3 (Lemmon) Distance

The distance of Comet C/2018 R3 (Lemmon) from Earth is currently 407,738,720 kilometers, equivalent to 2.725565 Astronomical Units. Light takes 22 minutes and 40.0700 seconds to travel from Comet C/2018 R3 (Lemmon) and arrive to us.

22 minutes and 40.0700 seconds

The following chart shows the distance of Comet C/2018 R3 (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/2018 R3 (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/2018 R3 (Lemmon) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2018 R3 (Lemmon) to Earth

Between January 2013 and December 2100 the closest approach of Comet C/2018 R3 (Lemmon) to Earth happens on Thu May 23 2019 at a distance of 1.92175259 Astronomical Units, or 287,490,097 kilometers:

Thu May 23 2019

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

Comet C/2018 R3 (Lemmon) brightness

The current visual magnitude of Comet C/2018 R3 (Lemmon) is 17.07.


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/2018 R3 (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/2018 R3 (Lemmon) between January 2013 and December 2100

Comet C/2018 R3 (Lemmon) 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/2018 R3 (Lemmon) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 72.7°
Max altitude: 55.7°
Azimuth: 287.0°
Comet C/2018 R3 (Lemmon) 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/2018 R3 (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/2018 R3 (Lemmon) Orbital Elements

The following table lists the orbital elements of Comet C/2018 R3 (Lemmon) at epoch 26 December 2018 00:00 UTC (JD: 2458479.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99929634
Orbit inclination i 69.71600752°
Perihelion distance q 1.29060019 AU
193,071,041 km
Aphelion distance Q 3,666.94307588 AU
548,566,877,231 km
Semi-major axis a 1,834.11683804 AU
274,379,974,136 km
Orbital period period 78,550.4500 years
28,690,553.2998 days
Date of perihelion transit Tp 2019-Jun-07 04:48:10
2,458,641.7001 JD
Next perihelion transit 80571-Jul-01 11:59
31,149,195.0000 JD
Argument of perihelion peri 112.8763247829°
Longitude of the ascending node node 324.62646452468°
Mean anomaly M 359.99796476418°
Mean motion n 0.00001255°/day

Visualization of Comet C/2018 R3 (Lemmon) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2018 R3 (Lemmon) with respect of the Sun and the orbits of the major planets. The position of Comet C/2018 R3 (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/2018 R3 (Lemmon)
View Comet C/2018 R3 (Lemmon) in the 3D Solar System Simulator

Comet C/2018 R3 (Lemmon) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2018 R3 (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/2018 R3 (Lemmon) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Aug 16 09h 44m 08s +20° 35’ 34” 16.86 Leo
2019 Aug 17 09h 45m 38s +20° 07’ 37” 16.89 Leo
2019 Aug 18 09h 47m 08s +19° 39’ 52” 16.92 Leo
2019 Aug 19 09h 48m 36s +19° 12’ 19” 16.94 Leo
2019 Aug 20 09h 50m 03s +18° 44’ 54” 16.97 Leo
2019 Aug 21 09h 51m 29s +18° 17’ 42” 16.99 Leo
2019 Aug 22 09h 52m 54s +17° 50’ 38” 17.02 Leo
2019 Aug 23 09h 54m 17s +17° 23’ 44” 17.05 Leo
2019 Aug 24 09h 55m 41s +16° 57’ 01” 17.07 Leo
2019 Aug 25 09h 57m 03s +16° 30’ 25” 17.10 Leo
2019 Aug 26 09h 58m 24s +16° 04’ 00” 17.12 Leo
2019 Aug 27 09h 59m 44s +15° 37’ 45” 17.15 Leo
2019 Aug 28 10h 01m 04s +15° 11’ 38” 17.17 Leo
2019 Aug 29 10h 02m 22s +14° 45’ 39” 17.20 Leo