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Asteroid 20 Massalia

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Asteroid 20 Massalia Position

Asteroid 20 Massalia is currently in the constellation of Sagittarius. The current Right Ascension is 19h 38m 00s and the Declination is -21° 00’ 04”.

19h 38m 00s
-21° 00’ 04”

Simplified sky chart showing where Asteroid 20 Massalia is right now in the sky with respect to the brightest stars and constellations (see full screen Online Planetarium)

Map showing Asteroid 20 Massalia in Sagittarius on January, 22 2020
Field of view: 60x30 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 showing where Asteroid 20 Massalia is right now (view fullscreen)

20 Massalia
RA: 19h 38m 00s
Dec: -21° 00’ 04”
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

The distance of Asteroid 20 Massalia from Earth is currently 556,298,210 kilometers, equivalent to 3.718624 Astronomical Units. Light takes 30 minutes and 55.6111 seconds to travel from Asteroid 20 Massalia and arrive to us.

30 minutes and 55.6111 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 1.07706230 Astronomical Units, or 161,126,227 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 11.82.


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: 111.0°
Max altitude: 17.5°
Azimuth: 249.0°
Asteroid 20 Massalia is above the horizon from Greenwich, United Kingdom

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 26 April 2019 00:00 UTC (JD: 2458600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.14206671
Orbit inclination i 0.70875120°
Perihelion distance q 2.06743203 AU
309,283,430 km
Aphelion distance Q 2.75213155 AU
411,713,021 km
Semi-major axis a 2.40978179 AU
360,498,226 km
Orbital period period 3.7400 years
1,366.3596 days
Date of perihelion transit Tp 2018-Feb-04 07:04:31
2,458,153.7948 JD
Next perihelion transit 2021-Nov-01 15:42
2,459,520.1544 JD
Argument of perihelion peri 256.77319637713°
Longitude of the ascending node node 206.10891085915°
Mean anomaly M 117.69512941179°
Mean motion n 0.26347384°/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
2020 Jan 15 19h 25m 00s -21° 28’ 42” 11.73 Sagittarius
2020 Jan 16 19h 26m 45s -21° 25’ 04” 11.75 Sagittarius
2020 Jan 17 19h 28m 31s -21° 21’ 20” 11.76 Sagittarius
2020 Jan 18 19h 30m 16s -21° 17’ 33” 11.78 Sagittarius
2020 Jan 19 19h 32m 03s -21° 13’ 41” 11.79 Sagittarius
2020 Jan 20 19h 33m 47s -21° 09’ 45” 11.80 Sagittarius
2020 Jan 21 19h 35m 34s -21° 05’ 44” 11.81 Sagittarius
2020 Jan 22 19h 37m 18s -21° 01’ 41” 11.82 Sagittarius
2020 Jan 23 19h 39m 03s -20° 57’ 33” 11.83 Sagittarius
2020 Jan 24 19h 40m 49s -20° 53’ 20” 11.84 Sagittarius
2020 Jan 25 19h 42m 33s -20° 49’ 04” 11.85 Sagittarius
2020 Jan 26 19h 44m 17s -20° 44’ 44” 11.86 Sagittarius
2020 Jan 27 19h 46m 02s -20° 40’ 18” 11.87 Sagittarius
2020 Jan 28 19h 47m 47s -20° 35’ 51” 11.88 Sagittarius