NGSLR Greenbelt, MD


workshop logo 19th International Workshop on Laser Ranging - Celebrating 50 years of SLR Release Date: 07/10/2014The National Aeronautics and Space Administration (NASA), along with the Smithsonian Astrophysical Observatory, and the International Laser Ranging Service (ILRS), are pleased to announce that the 19th International Workshop on Laser Ranging will be held in Annapolis Maryland during the week of October 27-31, 2014 at the Historic Inns of Annapolis.

October 31, 2014 will mark the 50th anniversary of the first successful SLR measurement, conducted at what is now the Goddard Geophysical and Astronomical Observatory (GGAO). The theme for this workshop, "Celebrating 50 Years of SLR: Remembering the Past and Planning for the Future" will allow us to look back on our many accomplishments and present plans for future advances in SLR technology and science.

Visit the workshop website for more information at:


The Russian BLITS nanosatellite has collided with a piece of space debris Release Date: 02/28/2013 On January 22, 2013, a collision happened between the BLITS passive laser nanosatellite and a space debris fragment. As a result, an abrupt change occurred of the BLITS orbit parameters (a decrease of the orbiting period). Besides this, as can be seen from the Altay SLR station photometrical observation results, the BLITS spin period has changed from 5.6 sec before collision to 2.1 sec after collision.

Currently, additional observations are made to determine the reasonability of continuing the BLITS observation campaign.

This information was sent to the ILRS by mission contacts in Russia (SRI for Precision Instrument Engineering).

International Laser Ranging Service 2009-2010 Report Available Online Release Date: 01/31/2013 The ILRS is very pleased to announce that the International Laser Ranging Service 2009-2010 Report is in final preparations for printing. Hardcopies will be shipped to all ILRS associates and correspondents in the coming weeks. In the meantime, the document is available online at:


NASA Beams Mona Lisa to Lunar Reconnaissance Orbiter at the Moon Release Date: 01/28/2013 Laser communication and ranging experiments were successfully conducted from the satellite laser ranging (SLR) station at NASA Goddard Space Flight Center (GSFC) to the Lunar Reconnaissance Orbiter (LRO) in lunar orbit. The experiments used 4096-ary pulse position modulation (PPM) for the laser pulses during one-way LRO Laser Ranging (LR) operations. Reed-Solomon forward error correction codes were used to correct the PPM symbol errors due to atmosphere turbulence and pointing jitter. The signal fading was measured and the results were compared to the model.

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