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
20200401  07 41    NE  8d old  Moonrise
20200401  10 53                Midday
20200401  17 17       53deg    Moon culminate
20200401  17 34       WNW      SUNSET
                               Twilight        02 39
20200401  20 13   WSW to  NW   Moonlight       05 19
20200401  22 52                Midnight
20200402  01 32                Twilight        02 39
20200402  02 49    NW  9d old  Moonset
20200402  04 11       ENE      SUNRISE
                               Day             13 25
20200402  08 45    NE  9d old  Moonrise
20200402  10 53                Midday
20200402  17 36       WNW      SUNSET
                               Twilight        02 41
20200402  18 12       52deg    Moon culminate
20200402  20 17    SW to WNW   Moonlight       05 10
20200402  22 52                Midnight
20200403  01 27                Twilight        02 41
20200403  03 25    NW 10d old  Moonset
20200403  04 08       ENE      SUNRISE
                               Day            >00 58

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 :