Online Sky Maps and Accurate Ephemeris Computation for Solar System Objects
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Ephemeris Computation

Use the form below to compute ephemerides for any date and time and display the predicted positions in the sky. For most objects ephemeris data is available up to Jan 1st 2025.

Time: : UTC

Welcome to This site provides detailed sky maps and ephemerides for a selection of interesting Solar System objects and detailed finder charts for other important transient astronomical objects like the most recent supernovae.

Besides the individual sky maps for major Solar System objects (the 7 planets and the Sun), asteroids (31), comets (64) and spacecraft (8), this site includes an Online Planetarium feature which can be used to compute and visualize the positions of all the Solar System objects tracked by this site up to the year 2025.

Your feedback is extremely appreciated and very important in order to constantly improve and make this service more useful, so please tell us what you think!

Interesting Close Conjunctions Happening Now

In astronomy a conjunction is defined as a close apparent alignment in the sky between two or more celestial bodies. Here we list, in real time, the closest conjunctions happening between objects we are currently tracking, in order of increasing separation. The green arrow indicates that the objects are currently getting closer, while the red arrow means that the objects are increasing their apparent separation.

Object 1 Object 2 Separation
Rosetta Spacecraft Maven Spacecraft 0° 00’ 00” Show sky map
Pluto New Horizons Spacecraft 0° 41’ 19” Show sky map
25D/Neujmin 2 Venus 0° 44’ 04” Show sky map
103P/Hartley 2 Saturn 1° 13’ 55” Show sky map
P/2014 L2 (NEOWISE) Astraea 1° 49’ 30” Show sky map

Current Oppositions

A Solar System object is said to be "at opposition" when it is visible in the opposite direction with respect to the Sun. Oppositions are usually favourable conditions for observation, since in this configuration objects are visible for most part of the night and they are usually closer to Earth. Below we list all the objects that have an elongation greater than 160&geg; with respect to the Sun.

Object Magnitude Elongation Distance (AU)
C/2013 X1 (PANSTARRS) 16.81 165.7° 4.845909 Show sky map
9P/Tempel 1 20.54 162.3° 3.181696 Show sky map
110P/Hartley 3 15.88 163.6° 1.515738 Show sky map
Sun -26.78 0.0° 0.984023 Show sky map
Hygiea 10.40 164.9° 2.432624 Show sky map
Pioneer 10 -100.00 172.3° 111.393297 Show sky map

The Top 10 Brightest Comets Visible Now

These are the top 10 brightest comets currently visible in the sky, according to the computed ephemerides. Please keep in mind that, as comets are highly dynamic bodies, the magnitude reported here is an approximation that sometimes can be largely different from the actual value. Click on each line to go to the comet's detail page, or click the blue 'full screen' icon () to view an accurate deep sky chart showing the comet's current position in real time (see all the 64 tracked comets...).

Comet Magnitude Constellation
C/2014 Q2 (Lovejoy) 7.50 Columba Show sky map
C/2012 K1 (PANSTARRS) 10.59 Sculptor Show sky map
C/2013 A1 (Siding Spring) 11.51 Ophiucus Show sky map
C/2014 R1 (Borisov) 12.22 Virgo Show sky map
15P/Finlay 13.43 Capricornus Show sky map
C/2014 Q3 (Borisov) 14.20 Draco Show sky map
C/2013 V5 (Oukaimeden) 14.27 Libra Show sky map
290P/Jager 14.57 Hydra Show sky map
80P/Peters-Hartley 14.62 Ophiucus Show sky map
C/2013 US10 14.71 Pisces Show sky map
» Show more...

The Top 10 Brightest Asteroids Visible Now

Click on each line to go to the asteroids's detail page, or click the blue 'full screen' icon () to view an accurate deep sky chart showing the asteroids's current position in real time (see all the 31 tracked asteroids...)..

Asteroid Magnitude Constellation
Vesta 7.71 Sagittarius Show sky map
Hebe 8.59 Eridanus Show sky map
Juno 8.67 Hydra Show sky map
Ceres 8.71 Ophiucus Show sky map
Pallas 9.88 Serpens Show sky map
Iris 10.09 Leo Show sky map
Flora 10.14 Leo Show sky map
Hygiea 10.40 Gemini Show sky map
Eunomia 10.60 Sagittarius Show sky map
Psyche 11.18 Capricornus Show sky map
» Show more...

The Major Planets in Order of Decreasing Brightness

Click on each line to go to the planet's detail page, or click the blue 'full screen' icon () to view an accurate deep sky chart showing the planet's current position in real time (go to the major bodies section...).

Planet Magnitude Constellation
Venus -3.87 Sagittarius Show sky map
Jupiter -2.36 Leo Show sky map
Mercury -0.99 Sagittarius Show sky map
Mars 1.06 Capricornus Show sky map
Saturn 1.39 Libra Show sky map
Uranus 5.80 Pisces Show sky map
Neptune 7.92 Aquarius Show sky map