00:00 site local. Astronomical dark, moon down. Sun -79°. Moon 1% waning crescent. Median SQM 21.9. No long moonless night in the published window
The log
Drawn from the observing log rather than written for the website, which is why some of these entries are about equipment failing and one is about a week when there was nothing to see.
2027-02-02
High-altitude dust from the north for six consecutive nights. Transparency 1, SQM down to 20.4 at the zenith with no moon — a full magnitude and a half worse than median, entirely from suspended dust.
Sofía Marchant
2027-01-17
Transit photometry run on Sombra: five hours of continuous 30-second exposures either side of a predicted ingress, defocused deliberately so the star spreads across enough pixels to average out the flat-field error.
Wren Okonkwo
2026-11-28
Nine hours of hydrogen-alpha on NGC 2070 through Sombra, in 600-second subs. Guiding held at about 0.6 arcseconds RMS all night, which is the mount behaving.
Bo Lindqvist
2026-10-09
Planned a Small Magellanic Cloud session; spent most of it forty arcminutes away on 47 Tucanae instead, as usual.
Renata Alcayaga
2026-08-11
Seeing of 5 — genuinely rare here, where the usual limit is 3 to 4 — and a 61% moon. Two years ago this would have been a cancelled night.
Tomás Iriarte
2026-07-03
New moon, mid-winter, no cloud. Ten hours and forty minutes of astronomical dark with the moon down for all of it — the longest fully usable night in the eighteen months the calendar covers.
Renata Alcayaga
2026-06-22
Minus nine at 04:00, and the secondary had walked far enough to be visible on a star test by the time we closed. Third time this winter, always after the temperature crosses about minus seven.
Sofía Marchant
2026-05-14
Best transparency of the autumn so far. 21.94 at the zenith with the moon well down, which is within a hundredth of the site median and about as good as it gets here.
Tomás Iriarte