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Asteroid 18 Melpomene

Available Resources

Asteroid 18 Melpomene Sky Charts and Coordinates

This is a simplified sky chart, showing where Asteroid 18 Melpomene 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.

Asteroid 18 Melpomene in Libra on December, 10 2018
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]
15h 50m 51s
-12° 28’ 41”

Asteroid 18 Melpomene Rise and Set Times

Today's Asteroid 18 Melpomene rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 102.5°
Max altitude: 26.1°
Azimuth: 257.5°

Asteroid 18 Melpomene Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 18 Melpomene with respect of the Sun and the orbits of the major planets. The position of Asteroid 18 Melpomene 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 Asteroid 18 Melpomene
View Asteroid 18 Melpomene in the 3D Solar System Simulator

Asteroid 18 Melpomene Ephemeris

The following table lists the ephemerides of Asteroid 18 Melpomene computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 18 Melpomene in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Dec 03 15h 38m 08s -11° 51’ 51” 11.87 Libra
2018 Dec 04 15h 39m 48s -11° 56’ 56” 11.87 Libra
2018 Dec 05 15h 41m 29s -12° 01’ 57” 11.88 Libra
2018 Dec 06 15h 43m 09s -12° 06’ 54” 11.88 Libra
2018 Dec 07 15h 44m 49s -12° 11’ 47” 11.88 Libra
2018 Dec 08 15h 46m 30s -12° 16’ 33” 11.89 Libra
2018 Dec 09 15h 48m 11s -12° 21’ 18” 11.89 Libra
2018 Dec 10 15h 49m 51s -12° 25’ 56” 11.89 Libra
2018 Dec 11 15h 51m 32s -12° 30’ 30” 11.90 Libra
2018 Dec 12 15h 53m 12s -12° 34’ 59” 11.90 Libra
2018 Dec 13 15h 54m 53s -12° 39’ 24” 11.90 Libra
2018 Dec 14 15h 56m 35s -12° 43’ 45” 11.90 Libra
2018 Dec 15 15h 58m 15s -12° 48’ 01” 11.91 Libra
2018 Dec 16 15h 59m 57s -12° 52’ 10” 11.91 Libra

Distance of Asteroid 18 Melpomene from Earth

The following chart shows the distance of Asteroid 18 Melpomene 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 18 Melpomene is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Asteroid 18 Melpomene from Earth between January 2013 and December 2075

Light Curve of Asteroid 18 Melpomene

The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 18 Melpomene, 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 Asteroid 18 Melpomene between January 2013 and December 2075

Asteroid 18 Melpomene Physical Data

The following shows the known values of the most important physical parameters of Asteroid 18 Melpomene. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 140.57 km 0.0110
Sideral Rotation 11.5700 hours 0.4834
Absolute Magnitude 6.51
Geometric Albedo 0.2225

Asteroid 18 Melpomene Orbital Elements

The following table lists the orbital elements of Asteroid 18 Melpomene at epoch 26 April 2019 00:00 UTC (JD: 2458600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.21767437
Orbit inclination i 10.12873160°
Perihelion distance q 1.79673089 AU
268,787,117 km
Aphelion distance Q 2.79657613 AU
418,361,835 km
Semi-major axis a 2.29665351 AU
343,574,476 km
Orbital period period 3.4800 years
1,271.2813 days
Date of perihelion transit Tp 2020-Mar-19 12:23:04
2,458,928.0160 JD
Argument of perihelion peri 227.95085219861°
Longitude of the ascending node node 150.38385683288°
Mean anomaly M 267.25437949687°
Mean motion n 0.28317888°/day
Closest approach to Earth* 2016-Oct-19
Distance of closest approach* 0.82954014 AU
124,097,439 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.