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
20170120  14 34        SW      SUNSET
                               Twilight        02 33
20170120  17 07                Night           07 50
20170120  23 00                Midnight
20170121  00 57   ESE 24d old  Moonrise
                   to SSE      Moonlight       03 56
20170121  04 53                Twilight        02 32
20170121  05 41       18deg    Moon culminate
20170121  07 25        SE      SUNRISE
                               Day             07 12
20170121  10 24   WSW 24d old  Moonset
20170121  11 01                Midday
20170121  14 37        SW      SUNSET
                               Twilight        02 32
20170121  17 09                Night           08 56
20170121  23 01                Midnight
20170122  02 05   ESE 25d old  Moonrise
                   to SSE      Moonlight       02 47
20170122  04 52                Twilight        02 31
20170122  06 26       15deg    Moon culminate
20170122  07 23        SE      SUNRISE
                               Day            >07 16
20170122  10 46   WSW 25d old  Moonset
20170122  11 01                Midday
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

Safety information (local access)
Telescope information
The flatfield system project
The dome control project
The sub-aperture and tube sock project
Sub-aperture mask (local access)
Light-shielding tube cover (local access)
Wind protecting slit cloth (local access)
Flatfield screen (local access)
Applying for observing time
Almanac and observing schedule
Daytime observations (local access)
Standard objects
Observing aids
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)
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 :