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🌎  Greenwich, United Kingdom [change]

Asteroid 20 Massalia

Asteroid 20 Massalia is currently in the constellation of Virgo. The current Right Ascension of Asteroid 20 Massalia is 13h 18m 04s and the Declination is -08° 14’ 05” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 20 Massalia is 11.58 (JPL).

Summary of key facts about Asteroid 20 Massalia [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]:

13h 18m 04s
-08° 14’ 05”
  • 20 Massalia is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-South-East direction at an altitude of 25° above the horizon.
  • Given its current magnitude, 20 Massalia is visible with the help of a telescope havng an aperture of 4 inches (100mm) or more.
  • See also 20 Massalia 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 20 Massalia available on TheSkyLive:

Available Resources

Asteroid 20 Massalia Position and Finder Charts

Below we provide Asteroid 20 Massalia 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 20 Massalia in Virgo on September, 30 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 20 Massalia in Virgo on September, 30 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 20 Massalia is right now. Click on the image to see a more detailed fullscreen tracker view.

20 Massalia
RA: 13h 18m 04s
Dec: -08° 14’ 05”
Deep sky finder chart for Asteroid 20 Massalia
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 20 Massalia?, a page that provides all the information needed to find Asteroid 20 Massalia in the sky and additional links to sky charts.

Asteroid 20 Massalia Distance from Earth

The distance of Asteroid 20 Massalia from Earth is currently 508,486,267 kilometers, equivalent to 3.399021 Astronomical Units. Light takes 28 minutes and 16.1276 seconds to travel from Asteroid 20 Massalia and arrive to us.

28 minutes and 16.1276 seconds

The following chart shows the distance of Asteroid 20 Massalia 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 20 Massalia 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 20 Massalia from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Asteroid 20 Massalia to Earth

Between January 2013 and December 2100, the closest approach of Asteroid 20 Massalia to Earth happens on Mon Jan 6 2048 at a distance of 1.077062 Astronomical Units, or 161,126,213 kilometers:

Mon Jan 6 2048

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

Asteroid 20 Massalia brightness

The current visual magnitude of Asteroid 20 Massalia is 11.58.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 20 Massalia, 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 20 Massalia between January 2013 and December 2100

Asteroid 20 Massalia 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 20 Massalia rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 98.2°
Max altitude: 30.3°
Azimuth: 261.7°

The rise and set times are defined as the time at which the upper limb of Asteroid 20 Massalia 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 20 Massalia Orbital Elements

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

Element Symbol Value
Orbit eccentricity e 0.14306413
Orbit inclination i 0.70880160°
Perihelion distance q 2.06419795 AU
308,799,619 km
Aphelion distance Q 2.75342731 AU
411,906,864 km
Semi-major axis a 2.40881263 AU
360,353,241 km
Orbital period period 3.7386 years
1,365.5354 days
Date of perihelion transit Tp 2021-Nov-04 04:31:23
2,459,522.6885 JD
Next perihelion transit 2025-Jul-31 17:22
2,460,888.2238 JD
Argument of perihelion peri 257.55921888585°
Longitude of the ascending node node 205.97388190765°
Mean anomaly M 20.513677699718°
Mean motion n 0.26363286°/day

Visualization of Asteroid 20 Massalia Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 20 Massalia with respect of the Sun and the orbits of the major planets. The position of Asteroid 20 Massalia 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 20 Massalia
View Asteroid 20 Massalia in the 3D Solar System Simulator

Asteroid 20 Massalia Physical Data

The following shows the known values of the most important physical parameters of Asteroid 20 Massalia. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 145.5 km 0.0114
Sideral Rotation 8.0980 hours 0.3383
Absolute Magnitude 6.5
Geometric Albedo 0.2096

Asteroid 20 Massalia 15 Days Ephemeris

The following table lists the ephemerides of Asteroid 20 Massalia computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 20 Massalia in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 Sep 23 13h 05m 04s -06° 56’ 08” 11.61 Virgo
2022 Sep 24 13h 06m 50s -07° 06’ 42” 11.61 Virgo
2022 Sep 25 13h 08m 34s -07° 17’ 13” 11.60 Virgo
2022 Sep 26 13h 10m 18s -07° 27’ 42” 11.60 Virgo
2022 Sep 27 13h 12m 02s -07° 38’ 12” 11.59 Virgo
2022 Sep 28 13h 13m 48s -07° 48’ 38” 11.59 Virgo
2022 Sep 29 13h 15m 33s -07° 59’ 03” 11.58 Virgo
2022 Sep 30 13h 17m 17s -08° 09’ 27” 11.58 Virgo
2022 Oct 01 13h 19m 03s -08° 19’ 48” 11.57 Virgo
2022 Oct 02 13h 20m 48s -08° 30’ 07” 11.57 Virgo
2022 Oct 03 13h 22m 32s -08° 40’ 26” 11.56 Virgo
2022 Oct 04 13h 24m 17s -08° 50’ 42” 11.56 Virgo
2022 Oct 05 13h 26m 03s -09° 00’ 56” 11.55 Virgo
2022 Oct 06 13h 27m 48s -09° 11’ 07” 11.55 Virgo