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Comet C/2018 R3 (Lemmon)

Available Resources

Comet C/2018 R3 (Lemmon) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2018 R3 (Lemmon) is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Comet C/2018 R3 (Lemmon) in Andromeda on April, 21 2019
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
00h 10m 48s
+43° 57’ 48”

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.

Comet C/2018 R3 (Lemmon) Rise and Set Times

Comet C/2018 R3 (Lemmon) is circumpolar from Greenwich, United Kingdom [change] and transits at 10:14 UTC (altitude: 82.5°)

Comet C/2018 R3 (Lemmon) Orbit Diagram

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) 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 Apr 14 23h 44m 57s +39° 17’ 04” 15.33 Andromeda
2019 Apr 15 23h 48m 10s +39° 54’ 33” 15.29 Andromeda
2019 Apr 16 23h 51m 28s +40° 32’ 15” 15.26 Andromeda
2019 Apr 17 23h 54m 51s +41° 10’ 08” 15.23 Andromeda
2019 Apr 18 23h 58m 18s +41° 48’ 10” 15.20 Andromeda
2019 Apr 19 00h 01m 53s +42° 26’ 21” 15.16 Andromeda
2019 Apr 20 00h 05m 33s +43° 04’ 37” 15.13 Andromeda
2019 Apr 21 00h 09m 19s +43° 43’ 00” 15.10 Andromeda
2019 Apr 22 00h 13m 11s +44° 21’ 28” 15.07 Andromeda
2019 Apr 23 00h 17m 11s +44° 59’ 54” 15.04 Andromeda
2019 Apr 24 00h 21m 16s +45° 38’ 21” 15.01 Andromeda
2019 Apr 25 00h 25m 31s +46° 16’ 45” 14.98 Andromeda
2019 Apr 26 00h 29m 52s +46° 55’ 05” 14.95 Cassiopeia
2019 Apr 27 00h 34m 21s +47° 33’ 15” 14.92 Cassiopeia

Distance of Comet C/2018 R3 (Lemmon) from Earth

The following chart shows the distance of Comet C/2018 R3 (Lemmon) from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2018 R3 (Lemmon) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2018 R3 (Lemmon) from Earth between January 2013 and December 2100

Light Curve of Comet C/2018 R3 (Lemmon)

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) Orbital Elements

The following table lists the orbital elements of Comet C/2018 R3 (Lemmon) at epoch 12 September 2018 00:00 UTC (JD: 2458374.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99910365
Orbit inclination i 69.73967307°
Perihelion distance q 1.29118304 AU
193,158,234 km
Aphelion distance Q 2,879.69265818 AU
430,795,890,798 km
Semi-major axis a 1,440.49192061 AU
215,494,524,516 km
Orbital period period 54,673.1900 years
19,969,383.9410 days
Date of perihelion transit Tp 2019-Jun-07 07:14:05
2,458,641.8015 JD
Argument of perihelion peri 112.86984461041°
Longitude of the ascending node node 324.62758507089°
Mean anomaly M 359.99518119718°
Mean motion n 0.00001803°/day
Closest approach to Earth* 2019-May-24
Distance of closest approach* 1.92209840 AU
287,541,829 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2100-Dec-31, with a sampling interval of 1 day.