Westerlundteleskopet, front page

The 90 cm Westerlund Telescope, Ångström Laboratory, Uppsala
Lon. 17 38 51.8E, Lat. 59 50 14.9N, Alt. 51 m

Left to right: Installation, primary mirror, CCD camera, dome shutter opening, telescope truss tube

Local time is UTC+2[hours].
Date     UTC-Time Az/Alt/Phase Event          Duration
YYYYMMDD  HH MM   Dir/Deg/Day                  HH MM
20220528  09 17       45deg    Moon culminate
20220528  10 47                Midday
20220528  17 31    NW 29d old  Moonset
20220528  19 48        NW      SUNSET
                               Twilight night  05 57
20220528  22 46                Midnight
20220529  01 25    NE 29d old  Moonrise
20220529  01 45        NE      SUNRISE
                               Day             18 05
20220529  10 01       49deg    Moon culminate
20220529  10 47                Midday
20220529  18 59    NW 30d old  Moonset
20220529  19 50        NW      SUNSET
                               Twilight night  05 54
20220529  22 47                Midnight
20220530  01 32    NE 30d old  Moonrise
20220530  01 44        NE      SUNRISE
                               Day            >00 17

Astronomical almanac for this location around the time of the last page load. Times are rounded to the nearest minute.
Red: The Sun rises.
Cyan: Twilight condition.
Green: Astronomical night.
Yellow: The Moon is up during night conditions.
Black: Additional information.

The Westerlund telescope was installed in its 6 m diameter dome on the fifth floor of Ångström Laboratory in October, 2003. It is a 90 cm classical Cassegrain reflector with two Nasmyth foci for semi-permanent mounting of different types of instrumentation. The main purpose of the telescope is undergraduate education and introduction to practical astronomical observation methods. The telescope is also used for professional research projects.

Left to right: M57 observed with the Westerlund Telescope, Rosetta space craft fly-by 050304, Comet 17P Holmes 071119 (median filtered)

Current status

Double filter wheel and ST1001E camera mounted at left Nasmyth focus.
UVRI filters installed in internal ST1001E filter wheel (open position available).
Eyepiece mounted at right Nasmyth focus.
Tube sock is not mounted.
Script available to add FITS header keywords during sequence imaging.

Detailed information

Observatory: Safety information (local access); Telescope information; The flatfield system project; The dome control project; The sub-aperture and tube sock project
Instrumentation: Detectors; Eyepieces; Filters; Sub-aperture mask (local access); Light-shielding tube cover (local access); Wind protecting slit cloth (local access); Flatfield screen (local access)
Observing: Applying for observing time; Almanac and observing schedule; Daytime observations (local access); Standard objects; Observing aids; Weather; Observation log; User manual (local access); Data archiving (local access); Archive search
Technical information: Cabling (local access); Control software; Derotator (local access); Dome (local access); Errors and problems (local access); Filter wheels (local access); Hand paddle (local access); Maintenance (local access); Support equipments (local access); Telescope and instrument status (local access)
Image gallery: Telescope and site; Astronomical objects; Add an image to the gallery (local access)
Outreach: Publications; Undergraduate exam project opportunities in astronomy ("Förslag på examensarbeten"); Special-event/sky shows/visits

Astronomers in charge

Prof. Nikolai Piskunov
Dr. Ola Karlsson (gallery maintenance)
PhD. Anna Önehag

Contact information

Phone to telescope control room: 018-471 3038

For all telescope/site related inquiries, please send an email to .

Note: The telescope is not open for public nighttime use. Please refer to the telescope shows in the observatory park.

Last update :