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Asteroid 18 Melpomene

Asteroid 18 Melpomene is currently in the constellation of Cancer. The current Right Ascension of Asteroid 18 Melpomene is 09h 10m 48s and the Declination is +17° 30’ 53” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 18 Melpomene is 11.73 (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]:

09h 10m 48s
+17° 30’ 53”
  • 18 Melpomene is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the West-South-West direction at an altitude of 44° 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 Cancer on May, 17 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 18 Melpomene in Cancer on May, 17 2021
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: 09h 10m 48s
Dec: +17° 30’ 53”
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 393,532,438 kilometers, equivalent to 2.630602 Astronomical Units. Light takes 21 minutes and 52.6829 seconds to travel from Asteroid 18 Melpomene and arrive to us.

21 minutes and 52.6829 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 121,533,023 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 11.73.


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: 72.5°
Max altitude: 56.0°
Azimuth: 287.6°

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 30 May 2020 00:00 UTC (JD: 2459000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.21750533
Orbit inclination i 10.13158957°
Perihelion distance q 1.79637982 AU
268,734,596 km
Aphelion distance Q 2.79503758 AU
418,131,672 km
Semi-major axis a 2.29570870 AU
343,433,134 km
Orbital period period 3.4800 years
1,270.4969 days
Date of perihelion transit Tp 2020-Mar-19 18:51:51
2,458,928.2860 JD
Next perihelion transit 2023-Sep-11 06:47
2,460,198.7829 JD
Argument of perihelion peri 228.07768634716°
Longitude of the ascending node node 150.36518232485°
Mean anomaly M 20.462102196045°
Mean motion n 0.28335371°/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
2021 May 10 09h 02m 03s +17° 52’ 39” 11.63 Cancer
2021 May 11 09h 03m 09s +17° 50’ 12” 11.65 Cancer
2021 May 12 09h 04m 14s +17° 47’ 39” 11.66 Cancer
2021 May 13 09h 05m 20s +17° 45’ 01” 11.67 Cancer
2021 May 14 09h 06m 26s +17° 42’ 16” 11.68 Cancer
2021 May 15 09h 07m 33s +17° 39’ 26” 11.70 Cancer
2021 May 16 09h 08m 41s +17° 36’ 32” 11.71 Cancer
2021 May 17 09h 09m 51s +17° 33’ 30” 11.72 Cancer
2021 May 18 09h 10m 59s +17° 30’ 24” 11.73 Cancer
2021 May 19 09h 12m 10s +17° 27’ 11” 11.74 Cancer
2021 May 20 09h 13m 19s +17° 23’ 53” 11.75 Cancer
2021 May 21 09h 14m 30s +17° 20’ 30” 11.76 Cancer
2021 May 22 09h 15m 42s +17° 17’ 03” 11.77 Cancer
2021 May 23 09h 16m 54s +17° 13’ 30” 11.79 Cancer