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+1[hours].
Date     UTC-Time Az/Alt/Phase Event          Duration
YYYYMMDD  HH MM   Dir/Deg/Day                  HH MM
20230205  23 03                Midnight
20230205  23 15       49deg    Moon culminate
20230206  04 28                Twilight        02 23
20230206  06 51       ESE      SUNRISE
                               Day             08 25
20230206  07 52    NW 16d old  Moonset
20230206  11 04                Midday
20230206  15 16       WSW      SUNSET
                               Twilight        02 24
20230206  15 43    NE 17d old  Moonrise
20230206  17 40    E  to WSW   Moonlight       10 46
20230206  23 03                Midnight
20230206  23 58       45deg    Moon culminate
20230207  04 26                Twilight        02 23
20230207  06 49       ESE      SUNRISE
                               Day             08 30
20230207  07 54   WNW 17d old  Moonset
20230207  11 04                Midday
20230207  15 19       WSW      SUNSET
                               Twilight        02 23
20230207  17 09   ENE 18d old  Moonrise
20230207  17 42   ENE to  SE   Moonlight      >04 27

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 :