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Comet C/2017 E4 (Lovejoy)

Available Resources

Comet C/2017 E4 (Lovejoy) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2017 E4 (Lovejoy) 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/2017 E4 (Lovejoy) in Eridanus on January, 17 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]
03h 34m 55s
-42° 49’ 33”

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/2017 E4 (Lovejoy) Rise and Set Times

Comet C/2017 E4 (Lovejoy) is currently not visible from Greenwich, United Kingdom [change]

Comet C/2017 E4 (Lovejoy) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 E4 (Lovejoy) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 E4 (Lovejoy) 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/2017 E4 (Lovejoy)
View Comet C/2017 E4 (Lovejoy) in the 3D Solar System Simulator

Comet C/2017 E4 (Lovejoy) Ephemeris

The following table lists the ephemerides of Comet C/2017 E4 (Lovejoy) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2017 E4 (Lovejoy) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Jan 10 03h 37m 26s -43° 26’ 48” 46.31 Eridanus
2019 Jan 11 03h 37m 04s -43° 22’ 14” 46.33 Eridanus
2019 Jan 12 03h 36m 42s -43° 17’ 35” 46.35 Eridanus
2019 Jan 13 03h 36m 21s -43° 12’ 51” 46.37 Eridanus
2019 Jan 14 03h 36m 02s -43° 08’ 04” 46.39 Eridanus
2019 Jan 15 03h 35m 43s -43° 03’ 14” 46.41 Eridanus
2019 Jan 16 03h 35m 25s -42° 58’ 19” 46.43 Eridanus
2019 Jan 17 03h 35m 08s -42° 53’ 21” 46.45 Eridanus
2019 Jan 18 03h 34m 50s -42° 48’ 21” 46.47 Eridanus
2019 Jan 19 03h 34m 35s -42° 43’ 18” 46.49 Eridanus
2019 Jan 20 03h 34m 19s -42° 38’ 11” 46.51 Eridanus
2019 Jan 21 03h 34m 05s -42° 33’ 02” 46.53 Eridanus
2019 Jan 22 03h 33m 51s -42° 27’ 48” 46.55 Eridanus
2019 Jan 23 03h 33m 38s -42° 22’ 35” 46.57 Eridanus

Distance of Comet C/2017 E4 (Lovejoy) from Earth

The following chart shows the distance of Comet C/2017 E4 (Lovejoy) 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/2017 E4 (Lovejoy) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2017 E4 (Lovejoy) from Earth between January 2013 and December 2075

Light Curve of Comet C/2017 E4 (Lovejoy)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2017 E4 (Lovejoy), 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/2017 E4 (Lovejoy) between January 2013 and December 2075

Comet C/2017 E4 (Lovejoy) Orbital Elements

The following table lists the orbital elements of Comet C/2017 E4 (Lovejoy) at epoch 30 March 2017 00:00 UTC (JD: 2457843.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99896671
Orbit inclination i 88.18676511°
Perihelion distance q 0.49357325 AU
73,837,508 km
Aphelion distance Q 954.84511045 AU
142,842,795,658 km
Semi-major axis a 477.66934185 AU
71,458,316,583 km
Orbital period period 10,439.9700 years
3,813,199.0732 days
Date of perihelion transit Tp 2017-Apr-23 07:32:50
2,457,866.8145 JD
Next perihelion transit 12457-Jun-29 09:18
6,271,065.8876 JD
Argument of perihelion peri 87.243851188204°
Longitude of the ascending node node 223.17182838589°
Mean anomaly M 359.99779890562°
Mean motion n 0.00009441°/day
Closest approach to Earth* 2017-Mar-31
Distance of closest approach* 0.60600429 AU
90,656,951 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.