Mercury (Planet)
© NASA/JPL/MESSENGER
Finder chart
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From Cambridge , Mercury is not observable – it will reach its highest point in the sky during daytime and is no higher than 2° above the horizon at dawn.
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|
Name
Mercury
|
Object type
Inferior planet
|
Current position
| Computed for: | 26 April 2025 |
| Right ascension: | 00h37m [2] |
| Declination: | +01°00' [2] |
| Constellation: | Cetus |
| Magnitude: | 0.15 (V) [1] |
| Angular diameter: | 7.3 arcsec[2] |
| Distance: | 0.92 AU 7.63 lightmin [2] |
| Angular motion (speed): | 1.21 deg/day[2] |
| Angular motion (pos ang): | 68.7° |
Orbital elements [2]
| Semi-major axis: | 0.39 AU |
| Eccentricity: | 0.205636 |
| Inclination: | 7.00° |
| Longitude ascending node: | 48.33° |
| Argument of perihelion: | 29.13° |
| Epoch of elements: | 01 January 2000 |
| Mean Anomaly at epoch: | 174.79° |
| Absolute mag (H): | -0.65 [1] |
| Slope parameter (n): | 2.00 [1] |
Derived quantities
| Perihelion: | 0.31 AU |
| Aphelion: | 0.47 AU |
| Orbital period: | 0.24 years |
Sources
| [1] | Robin M. Green, Spherical Astronomy, 1985, ISBN 0-521-31779-7 |
| [2] | Explanatory Supplement to the Astronomical Almanac, 2013, Urban & Seidelmann, Eds., Table 8.7, ISBN 978-1-891389-85-6 |
Visibility from Cambridge
All times shown in Cambridge local time.
Events
| 17 Apr 2025 | – Mercury at aphelion |
| 19 Apr 2025 | – Mercury at highest altitude in morning sky |
| 21 Apr 2025 | – Mercury at greatest elongation west |
| 24 Apr 2025 | – Mercury at dichotomy |
| 30 May 2025 | – Mercury at superior solar conjunction |
| 31 May 2025 | – Mercury at perihelion |
| 26 Jun 2025 | – Mercury at highest altitude in evening sky |
| 28 Jun 2025 | – Mercury at dichotomy |
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