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🌎 Location: Greenwich, United Kingdom [change]
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Mercury

Available Resources

Mercury Sky Charts and Coordinates

This is a simplified sky chart, showing where Mercury 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.

Mercury in Libra on December, 15 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]
16h 00m 16s
-18° 16’ 00”
6.7”
-0.46

Mercury Rise and Set Times

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

Azimuth: 108.3°
Max altitude: 20.2°
Azimuth: 251.6°

Mercury Ephemeris

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

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Apparent DiameterDiameter Constellation
2018 Dec 08 15h 41m 56s -16° 51’ 56” 0.04 8.0” Libra
2018 Dec 09 15h 42m 59s -16° 56’ 04” -0.11 7.8” Libra
2018 Dec 10 15h 44m 38s -17° 03’ 23” -0.22 7.6” Libra
2018 Dec 11 15h 46m 46s -17° 13’ 26” -0.31 7.4” Libra
2018 Dec 12 15h 49m 24s -17° 25’ 49” -0.37 7.2” Libra
2018 Dec 13 15h 52m 27s -17° 40’ 09” -0.41 7.0” Libra
2018 Dec 14 15h 55m 54s -17° 56’ 05” -0.44 6.9” Libra
2018 Dec 15 15h 59m 39s -18° 13’ 18” -0.46 6.7” Libra
2018 Dec 16 16h 03m 44s -18° 31’ 31” -0.47 6.6” Scorpius
2018 Dec 17 16h 08m 04s -18° 50’ 26” -0.48 6.4” Scorpius
2018 Dec 18 16h 12m 39s -19° 09’ 48” -0.48 6.3” Scorpius
2018 Dec 19 16h 17m 27s -19° 29’ 29” -0.47 6.2” Scorpius
2018 Dec 20 16h 22m 27s -19° 49’ 14” -0.47 6.1” Scorpius
2018 Dec 21 16h 27m 36s -20° 08’ 54” -0.46 6.0” Ophiucus

Distance of Mercury from Earth

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

Distance of Mercury from Earth between January 2013 and December 2075

Light Curve of Mercury

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

Mercury Physical Data

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

Physical Parameter Value Relative to Earth
Diameter 4879.4 km 0.3829
Mass 0.330104 x 1024 kg 0.0553
Density 5.427 gr/cm3 0.9843
Escape Velocity 4.25 km/s 0.3798
Sideral Rotation 1,407.5088 hours 58.8068
Absolute Magnitude -0.6
Geometric Albedo 0.106