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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 Aquarius on February, 21 2018
High Precision Live Sky Chart
22h 29m 44s
-11° 20’ 56”
-1.64
 = 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: 101.3°
Max altitude: 27.2°
Azimuth: 258.7°

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
2018 Feb 14 -1.40 21h 41m 12s -16° 03’ 32” Capricornus
2018 Feb 15 -1.49 21h 48m 07s -15° 27’ 20” Capricornus
2018 Feb 16 -1.57 21h 55m 04s -14° 49’ 44” Capricornus
2018 Feb 17 -1.64 22h 01m 59s -14° 10’ 42” Aquarius
2018 Feb 18 -1.68 22h 08m 56s -13° 30’ 19” Aquarius
2018 Feb 19 -1.69 22h 15m 51s -12° 48’ 32” Aquarius
2018 Feb 20 -1.67 22h 22m 47s -12° 05’ 23” Aquarius
2018 Feb 21 -1.64 22h 29m 44s -11° 20’ 56” Aquarius
2018 Feb 22 -1.60 22h 36m 39s -10° 35’ 12” Aquarius
2018 Feb 23 -1.56 22h 43m 35s -09° 48’ 14” Aquarius
2018 Feb 24 -1.52 22h 50m 30s -09° 00’ 05” Aquarius
2018 Feb 25 -1.48 22h 57m 23s -08° 10’ 50” Aquarius
2018 Feb 26 -1.44 23h 04m 14s -07° 20’ 33” Aquarius
2018 Feb 27 -1.40 23h 11m 04s -06° 29’ 20” Aquarius

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