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🌎  Greenwich, United Kingdom [change]

Asteroid 18 Melpomene

Asteroid 18 Melpomene is currently in the constellation of Libra. The current Right Ascension of Asteroid 18 Melpomene is 15h 54m 44s and the Declination is -12° 06’ 35” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 18 Melpomene is 11.70 (JPL).

Summary of key facts about Asteroid 18 Melpomene [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

15h 54m 44s
-12° 06’ 35”
  • 18 Melpomene is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-West direction at an altitude of 14° above the horizon.
  • Given its current magnitude, 18 Melpomene is visible with the help of a telescope havng an aperture of 4 inches (100mm) or more.
  • See also 18 Melpomene rise and set times.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Additional information about Asteroid 18 Melpomene available on TheSkyLive:

Available Resources

Asteroid 18 Melpomene Position and Finder Charts

Below we provide Asteroid 18 Melpomene finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Asteroid 18 Melpomene in Libra on October, 01 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 18 Melpomene in Libra on October, 01 2022
Field of view: 10x6 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]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Asteroid 18 Melpomene is right now. Click on the image to see a more detailed fullscreen tracker view.

18 Melpomene
RA: 15h 54m 44s
Dec: -12° 06’ 35”
Deep sky finder chart for Asteroid 18 Melpomene
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 18 Melpomene?, a page that provides all the information needed to find Asteroid 18 Melpomene in the sky and additional links to sky charts.

Asteroid 18 Melpomene Distance from Earth

The distance of Asteroid 18 Melpomene from Earth is currently 442,934,829 kilometers, equivalent to 2.960836 Astronomical Units. Light takes 24 minutes and 37.4716 seconds to travel from Asteroid 18 Melpomene and arrive to us.

24 minutes and 37.4716 seconds

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

Closest approach of Asteroid 18 Melpomene to Earth

Between January 2013 and December 2100, the closest approach of Asteroid 18 Melpomene to Earth happens on Thu Oct 6 2089 at a distance of 0.812398 Astronomical Units, or 121,533,026 kilometers:

Thu Oct 6 2089

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

Asteroid 18 Melpomene brightness

The current visual magnitude of Asteroid 18 Melpomene is 11.70.


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 2100

Asteroid 18 Melpomene rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Asteroid 18 Melpomene rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 102.1°
Max altitude: 26.4°
Azimuth: 257.9°

The rise and set times are defined as the time at which the upper limb of Asteroid 18 Melpomene touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Asteroid 18 Melpomene Orbital Elements

The following table lists the orbital elements of Asteroid 18 Melpomene at epoch 20 January 2022 00:00 UTC (JD: 2459600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.21790920
Orbit inclination i 10.13249543°
Perihelion distance q 1.79551534 AU
268,605,272 km
Aphelion distance Q 2.79606236 AU
418,284,977 km
Semi-major axis a 2.29578885 AU
343,445,124 km
Orbital period period 3.4786 years
1,270.5634 days
Date of perihelion transit Tp 2023-Sep-11 16:02:40
2,460,199.1685 JD
Argument of perihelion peri 228.11923980983°
Longitude of the ascending node node 150.36172916921°
Mean anomaly M 190.37393436167°
Mean motion n 0.28333887°/day

Visualization of Asteroid 18 Melpomene Orbit

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 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 15 Days 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
2022 Sep 24 15h 43m 10s -11° 09’ 42” 11.70 Libra
2022 Sep 25 15h 44m 38s -11° 17’ 09” 11.70 Libra
2022 Sep 26 15h 46m 05s -11° 24’ 34” 11.70 Libra
2022 Sep 27 15h 47m 34s -11° 31’ 57” 11.70 Libra
2022 Sep 28 15h 49m 04s -11° 39’ 17” 11.70 Libra
2022 Sep 29 15h 50m 32s -11° 46’ 36” 11.70 Libra
2022 Sep 30 15h 52m 04s -11° 53’ 51” 11.70 Libra
2022 Oct 01 15h 53m 35s -12° 01’ 04” 11.70 Libra
2022 Oct 02 15h 55m 05s -12° 08’ 13” 11.70 Libra
2022 Oct 03 15h 56m 38s -12° 15’ 21” 11.70 Libra
2022 Oct 04 15h 58m 10s -12° 22’ 27” 11.70 Libra
2022 Oct 05 15h 59m 44s -12° 29’ 29” 11.70 Libra
2022 Oct 06 16h 01m 18s -12° 36’ 28” 11.70 Libra
2022 Oct 07 16h 02m 53s -12° 43’ 23” 11.70 Scorpius