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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 Sagittarius on January, 22 2017
High Precision Live Sky Chart
18h 34m 21s
-22° 15’ 51”
-0.22
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Mercury Rise and Set Times

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

Azimuth: 112.3°
Max altitude: 16.3°
Azimuth: 247.7°

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 MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2017 Jan 15 -0.18 18h 05m 31s -21° 21’ 48” Sagittarius
2017 Jan 16 -0.20 18h 08m 51s -21° 30’ 51” Sagittarius
2017 Jan 17 -0.21 18h 12m 29s -21° 39’ 39” Sagittarius
2017 Jan 18 -0.22 18h 16m 23s -21° 48’ 05” Sagittarius
2017 Jan 19 -0.22 18h 20m 34s -21° 55’ 59” Sagittarius
2017 Jan 20 -0.23 18h 24m 57s -22° 03’ 19” Sagittarius
2017 Jan 21 -0.22 18h 29m 34s -22° 09’ 57” Sagittarius
2017 Jan 22 -0.22 18h 34m 21s -22° 15’ 51” Sagittarius
2017 Jan 23 -0.22 18h 39m 19s -22° 20’ 53” Sagittarius
2017 Jan 24 -0.21 18h 44m 26s -22° 25’ 05” Sagittarius
2017 Jan 25 -0.21 18h 49m 41s -22° 28’ 18” Sagittarius
2017 Jan 26 -0.20 18h 55m 04s -22° 30’ 33” Sagittarius
2017 Jan 27 -0.20 19h 00m 33s -22° 31’ 46” Sagittarius
2017 Jan 28 -0.20 19h 06m 10s -22° 31’ 55” Sagittarius

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 January 2030

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 January 2030

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