Comet C/2018 R3 (Lemmon)
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.
High Precision Live Sky Chart
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
Today's Comet C/2018 R3 (Lemmon) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.
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!
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 |
|---|---|---|---|---|
| 2018 Dec 04 | 20h 43m 18s | -02° 53’ 57” | 18.84 | Aquarius |
| 2018 Dec 05 | 20h 43m 45s | -02° 46’ 23” | 18.83 | Aquarius |
| 2018 Dec 06 | 20h 44m 15s | -02° 38’ 44” | 18.81 | Aquarius |
| 2018 Dec 07 | 20h 44m 44s | -02° 30’ 57” | 18.80 | Aquarius |
| 2018 Dec 08 | 20h 45m 15s | -02° 23’ 05” | 18.79 | Aquarius |
| 2018 Dec 09 | 20h 45m 46s | -02° 15’ 07” | 18.77 | Aquarius |
| 2018 Dec 10 | 20h 46m 18s | -02° 07’ 03” | 18.76 | Aquarius |
| 2018 Dec 11 | 20h 46m 51s | -01° 58’ 53” | 18.74 | Aquarius |
| 2018 Dec 12 | 20h 47m 26s | -01° 50’ 35” | 18.73 | Aquarius |
| 2018 Dec 13 | 20h 48m 01s | -01° 42’ 11” | 18.71 | Aquarius |
| 2018 Dec 14 | 20h 48m 37s | -01° 33’ 42” | 18.69 | Aquarius |
| 2018 Dec 15 | 20h 49m 14s | -01° 25’ 05” | 18.68 | Aquarius |
| 2018 Dec 16 | 20h 49m 50s | -01° 16’ 22” | 18.66 | Aquarius |
| 2018 Dec 17 | 20h 50m 30s | -01° 07’ 32” | 18.65 | Aquarius |
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.
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.
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 2075-Dec-31, with a sampling interval of 1 day.