ESA Earth Observation
Places · Ground station
ESOC — European Space Operations Centre
Every ESA mission is flown from this building. The Rosetta landing and the Schiaparelli loss were both watched from the same control room.
The sky from here
The sky over this spot is zone 7 — urban, Bortle 7–8, with a naked-eye limit around magnitude 4.2–5.0. The whole sky is greyish. Stars beyond the fourth magnitude are gone, and the Pleiades are a smudge if they show at all.
Against that sky 28 of the 110 Messier objects are straightforward in 10×50 binoculars and 30 in a 130mm, with 9 reachable by eye alone.
Between 2 June and 10 July the Sun never gets eighteen degrees below the horizon from this latitude, so there is no astronomical darkness at all for those 39 nights. Nothing faint is observable in that window, however far you drive from the nearest town.
The centre of the galaxy only ever reaches 11° above the horizon from here, so the richest part of the Milky Way is always seen through the thickest air. It is the single biggest difference between this sky and one further south. Of the 110 Messier objects, 21 never set from here and every one of them rises at some point in the year.
The sky here is kindest to Owl Nebula, Spindle Galaxy and Sunflower Galaxy, each of which passes within a few degrees of overhead — an object at the zenith is being seen through the least air it will ever be seen through, and the difference against the same object low in the south is not subtle.
Little Dumbbell, Whirlpool Galaxy and Pinwheel Galaxy never set from this latitude, so they are available on any clear night of the year rather than for one season of it.
Read at 49.87°N 8.62°E. Darkness is estimated rather than measured; everything else follows from the latitude and holds along the whole parallel. How accurate this is.
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Questions
What part of the sky never rises at ESOC?
Everything south of declination −40°. From 49.9°N that is a cap 50° in radius centred on the south celestial pole, which is 18% of the whole celestial sphere. It is out of reach permanently rather than seasonally: no time of year and no instrument brings it above the horizon. The matching 18% around the north celestial pole is the same geometry inverted, and never sets.
How many hours of true darkness does ESOC get?
Anything from 11 hours 56 minutes down to none whatsoever. Around 21 December the night is as long as it gets here, and around 2 June the sky simply never finishes darkening — a problem no amount of driving solves, because it is the Sun's depression angle and not the streetlights. The measure is astronomical darkness — the Sun a full eighteen degrees under — not simply the hours between sunset and sunrise.
When is the Milky Way best from ESOC?
August and early September, which is a compromise rather than an optimum. The core transits at local midnight around 17 June wherever you are, but 49.9°N spends that part of the summer without any astronomical darkness at all, so the peak is unusable. The workable window opens when the nights return and closes as the core sinks into the evening twilight — a few weeks, and the reason northern observers travel.
How far is ESOC from the other sites on this map?
Its closest neighbour on this map is Effelsberg 100-m Radio Telescope, 144 km away to the north-west. The nearest other ground station is Madrid Deep Space Complex, 1,450 km to the south-west. These are straight-line distances over the surface, not driving distances, and in this part of the world the two can differ considerably.