Discover the Observatory
Instituto de Astrofísica de Andalucía - CSIC


Visit the OSN and the IRAM 30-meter telescope
in July or August


Call for Observing Proposals
Semester 2023A
opening soon.


Telecopes & Instruments





List of publications performed with data obtained from the Observatorio de Sierra Nevada.

Seeing measurements

Measurements in and out dome obtained in the seeing characterization campaigns.


Astronomical data archive.


Thesis carried out with data collected from the Observatorio de Sierra Nevada and from old Observatorio del Mojón del Trigo.

Meteors and fireballs

List of meteors and fireballs detected with the Observatorio de Sierra Nevada fireball detection station which is part of the SMART project.



Observing at OSN



Call for proposals

Application deadlines for observing time and proposals and forms.

Time Allocation Committee

Time Allocation Committe (TAC) members.

Telescopes schedule

Timeline for both telescopes.

Preparing for the observation

Tools for preparing the observation: Staralt programme for knowing the visibility of objects, list of standard stars, on-line surveys..


Director's Discretionary Time application.






OSN weather

Current weather at OSN.

OSN webcam

Webcam situated in the main building pointing to southeast.

SNOWS Station

Weather station SNOWS (Sierra Nevada Observatory Weather Station). Only IAA Network.

CAHA Weather

Current weather at the Calar Alto Observatory (Almería).

Satellite images (Web AEMET)

Link to METEOSAT satellite images of the web Agencia Estatal de Meteorología.

Weather archive

Weather archive of OSN.

AllSky webcam

With this webcam is possible to see practically all night sky. It is located on the roof of the main building between both domes. It is only operated when it gets dark.

CETURSA webcams

Images of the several webcams located in different points of the ski resort.

IRAM-30m weather

Current weather of the IRAM 30m radio telescope (Sierra Nevada, Granada).

Satellite images (Web EUMETSAT)

Link to the METEOSAT satellite images of the web EUTMESAT.

  • Planetary Nebula in the constellation Lynx.
    Planetary Nebula PK164+31.1

    Planetary Nebula PK164+31.1

    Planetary Nebula in the constellation Lynx.

    PK164+31.1, also known as Jones-Emberson 1, is a low bright planetary nebula that lies about 1,600 light years away towards the constellation Lynx. Due to its magnitude 17 it is only visible in good-size telescopes. A hot blue white dwarf star near the center of the nebula is what remains of the nucleus because the gas is expelled at different times (as can be seen the image) at the end of the life of the star. The expanding nebula will fade over the next thousands of years while the central star can survive for billions of years.

    Image: Combination of 3 images of 900 seconds in the Hα, NII and OIII filters taken with the CCDT150 camera of the T150 telescope.

    10/01/2017 L.F. Miranda

  • Nebula in the constellation of Taurus.
    M1 (Crab Nebula)

    M1 (Crab Nebula)

    Nebula in the constellation of Taurus.

    The Crab Nebula is a supernova remnant of plerion type (is a nebula powered by the pulsar wind of a pulsar). At the center of the nebula lies a pulsar with a spin rate of 30.2 times per second which emits pulses of radiation from gamma rays to radio waves. The nebula lies in the Perseus Arm of the Milky Way galaxy. It is located at a distance of about 1930 parsec (6300 light years) from Earth, it has a diameter of 3.4 parsec (11 light years) and it is expanding at a rate of about 1,500 km/s. The discovery of the nebula was the first evidence to show that supernova explosions produce pulsars.

    Photograph: combination of 6 200-second images on each of the Johnson BVI filters taken with the CCDT150 camera attached to T150 telescope.

  • Globular Cluster in the constellation of Aquarius.


    Globular Cluster in the constellation of Aquarius.

    This cluster is about 37500 light-years distnat from Earth and it is at 175 light-years in diameter, so it is one of the larger globular clusters known. It is 13 billion years old and one of the older globulars associated with Milky Way. The cluster is compact and rich in stars, about 150000, inluding 21 known variable stars.

    Photograph: combination o a serie of 3x120 second images on each of the Johnson BVR filters taken with the T150 telescope.



OSN Images


Observatorio de Sierra Nevada




A brief introduction about the OSN.

Guided visit

Guided visits to the observatory for the general public in the months of summer.

Annual reports

The OSN activities are summarized in the annual reports.


List of personnel assigned to the OSN as well as IAA - CSIC technical personnel who provide support to OSN.

Brief history of the OSN

History of the observatory since its foundation.


Access to restricted information for personnel assigned to OSN through its intranet.



Observatorio de Sierra Nevada

Parque Natural de Sierra Nevada
Granada, Spain
Longitude: W 03º 23´ 05"
Latitude: N 37º 03´ 51"
Altitude: 2896 m

Instituto de Astrofísica de Andalucía

Address: Glorieta de la Astronomía s/n, 18008 Granada, Spain

Tel: (+34) 958 12 13 11

Fax: (+34) 958 814 530

E-mail: contact-osn [at] iaa.es