Mercury
Mercury Position
Mercury is currently in the constellation of Gemini. The current Right Ascension is 07h 28m 51s and the Declination is +23° 22’ 40”.
Simplified sky chart showing where Mercury is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)
Hihgher precision deep sky finder chart showing where Mercury is right now (view fullscreen)
Also check out Where is Mercury?, a page that provides all the information needed to find Mercury in the sky and additional links to sky charts.
Mercury Distance
The distance of Mercury from Earth is currently 139,132,071 kilometers, equivalent to 0.930040 Astronomical Units. Light takes 7 minutes and 44.0946 seconds to travel from Mercury and arrive to us.
The following chart shows the distance of Mercury 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.
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 Mercury from Earth is also available as a real time updated value in the Live Position and Data Tracker.
Closest approach of Mercury to Earth
Between January 2013 and December 2100 the closest approach of Mercury to Earth happens on Sun May 31 2015 at a distance of 0.54903598 Astronomical Units, or 82,134,613 kilometers:
NOTE: values for the closest approach are computed with a sampling interval of 1 day.
Mercury brightness
The current visual magnitude of Mercury is 0.05.
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.
Mercury rise and set times
Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London
Today's Mercury rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):
The rise and set times are defined as the time at which the upper limb of Mercury touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.
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 |
Mercury 15 Days 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 |
|---|---|---|---|---|---|
| 2019 Jun 10 | 06h 38m 49s | +25° 13’ 05” | -0.44 | 6.3” | Gemini |
| 2019 Jun 11 | 06h 45m 56s | +25° 04’ 05” | -0.37 | 6.4” | Gemini |
| 2019 Jun 12 | 06h 52m 50s | +24° 53’ 26” | -0.31 | 6.5” | Gemini |
| 2019 Jun 13 | 06h 59m 29s | +24° 41’ 12” | -0.24 | 6.6” | Gemini |
| 2019 Jun 14 | 07h 05m 54s | +24° 27’ 34” | -0.18 | 6.7” | Gemini |
| 2019 Jun 15 | 07h 12m 07s | +24° 12’ 38” | -0.12 | 6.8” | Gemini |
| 2019 Jun 16 | 07h 18m 06s | +23° 56’ 29” | -0.06 | 7.0” | Gemini |
| 2019 Jun 17 | 07h 23m 49s | +23° 39’ 15” | 0.00 | 7.1” | Gemini |
| 2019 Jun 18 | 07h 29m 20s | +23° 21’ 05” | 0.06 | 7.2” | Gemini |
| 2019 Jun 19 | 07h 34m 35s | +23° 02’ 02” | 0.12 | 7.4” | Gemini |
| 2019 Jun 20 | 07h 39m 36s | +22° 42’ 14” | 0.18 | 7.5” | Gemini |
| 2019 Jun 21 | 07h 44m 21s | +22° 21’ 47” | 0.24 | 7.7” | Gemini |
| 2019 Jun 22 | 07h 48m 52s | +22° 00’ 47” | 0.31 | 7.8” | Gemini |
| 2019 Jun 23 | 07h 53m 08s | +21° 39’ 21” | 0.37 | 8.0” | Gemini |