Mercury (Planet)

Image of Mercury
© NASA/JPL/MESSENGER
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From South El Monte , Mercury is not observable – it will reach its highest point in the sky during daytime and is no higher than 4° above the horizon at dusk.

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Name Mercury
Object type Inferior planet
Current position
Computed for:13 July 2025
Right ascension:09h04m [2]
Declination:+14°36' [2]
Constellation:Cancer
Magnitude:1.11 (V) [1]
Angular diameter:9.5 arcsec[2]
Distance:0.70 AU
5.84 lightmin [2]
Angular motion (speed):28.89 arcmin/day[2]
Angular motion (pos ang):136.4°
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 South El Monte

All times shown in South El Monte local time.

Events
27 Jun 2025  –  Mercury at highest altitude in evening sky
28 Jun 2025  –  Mercury at dichotomy
03 Jul 2025  –  Mercury at greatest elongation east
14 Jul 2025  –  Mercury at aphelion
31 Jul 2025  –  Mercury at inferior solar conjunction
19 Aug 2025  –  Mercury at greatest elongation west
20 Aug 2025  –  Mercury at highest altitude in morning sky
21 Aug 2025  –  Mercury at dichotomy
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South El Monte

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34.05°N
118.05°W
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