DATE 1990 OBSERVER(S) BLAIR ET AL. SITE CSIRO INSTR. SIZE (M) 64 SEARCH FREQ. (MHz) 4462 MHz 25 kHz FREQ. RES. (Hz) 100 OBJECTS 100 SOLAR-TYPE STARS VISIBLE ONLY FROM SOUTHERN HEMISPHERE FLUX LIMITS (W/m 2 ) 2 Jy TOTAL HOURS 60 REFERENCE 45 COMMENTS Magic frequency search at pi times hydrogen line frequency. 1280 channels were arranged to sample three reference frames: solar barycenter, stellar barycenter and geocenter.

DATE 1990 OBSERVER(S) GRAY SITE OAK RIDGE (HARVARD UNIVERSITY) INSTR. SIZE (M) 26 SEARCH FREQ. (MHz) 1420.4 MHz RELATIVE TO GALACTIC STANDARD OF REST 200 kHz FREQ. RES. (Hz) 0.05 OBJECTS M31 AND M33 FLUX LIMITS (W/m 2 ) TOTAL HOURS 50 REFERENCE COMMENTS Long integrations (5 hours per HPBW) on 10 11 stars at once, looking for low duty cycle signals.

DATE 1990 1995 OBSERVER(S) GRAY SITE SMALL SETI OBSERVATORY INSTR. SIZE (M) 4 SEARCH FREQ. (MHz) 1419.5 - 1420.5 FREQ. RES. (Hz) 100 -> 1 OBJECTS FLUX LIMITS (W/m 2 ) 1 x 10 -21 TOTAL HOURS ONGOING ~6 HOURS/NIGHT REFERENCE 54 COMMENTS Dedicated meridian transit search system constructed by amateurs, automated operation at night.

DATE 1990 ON OBSERVER(S) BETZ SITE MT. WILSON INSTR. SIZE (M) 1.65 M ELEMENT OF TOWNES IR INTERFEROMETER SEARCH FREQ. (MHz) 10 MICRONS FREQ. RES. (Hz) 3.5 MHz (35 m/s) OBJECTS 100 NEARBY SOLAR-TYPE STARS FLUX LIMITS (W/m 2 ) 1 MW TRANSMITTER OUT TO 20pc TOTAL HOURS CONTINUING REFERENCE 56 COMMENTS Search for IR beacons at CO 2 laser frequency using narrowband acousto-optical spectrometer.

DATE 1990 ON OBSERVER(S) LEMARCHAND META II SITE INSTITUTE FOR ARGENTINE RADIOASTRONOMY (IAR) INSTR. SIZE (M) 30 (ONE OF TWO) SEARCH FREQ. (MHz) 1420.4, 1667, 3300 FREQ. RES. (Hz) 0.05 OBJECTS SKY SURVEY OF SOUTHERN SKIES AND 90 TARGET STARS, AND OH MASERS FLUX LIMITS (W/m 2 ) 1 x 10 -23 TO 7 x 10 -25 TOTAL HOURS ONGOING REFERENCE 47 COMMENTS Search for signals that have been Doppler compensated to rest frame of SS barycenter, Galactic Center or CMB. A duplicate of META system build by Argentinian engineers under the guidance of Prof. Horowitz at Harvard and financed by the Planetary Society. Simultaneous observations with META over declination range -10 to -30. Major upgrades in 1996 to permit long integration times, and switching between antennas. Search through OH masers looking for amplified signals.

DATE 1992 1993 OBSERVER(S) NASA HRMS SKY SURVEY SITE GOLDSTONE, CA INSTR. SIZE (M) 26, 34 SEARCH FREQ. (MHz) 1700 & 8300 -> 8700 FREQ. RES. (Hz) 19 OBJECTS 72 SKY FRAMES AT X-BAND AND 130 SKY FRAMES REPEATEDLY MAPPING 3 GALACTIC PLANE REGIONS AT L-BAND IN SEQUENTIAL CIRCULAR POLARIZATION FLUX LIMITS (W/m 2 ) 9.8 x 10 -23 TOTAL HOURS 1,386 REFERENCE 49b COMMENTS No detection of non-human technology.

DATE 1992 1993 OBSERVER(S) NASA HRMS TARGETED SEARCH SITE ARECIBO, PR INSTR. SIZE (M) 305 SEARCH FREQ. (MHz) 1300 - 2400 FREQ. RES. (Hz) 1, 7, 28 SIMULTANEOUSLY, DUAL CIRCULAR POLARIZATION OBJECTS 25 STARS FLUX LIMITS (W/m 2 ) 5 x 10 -24 TOTAL HOURS 200 REFERENCE 49a COMMENTS No detection of non-human technology.

DATE 1992 ON OBSERVER(S) BOWYER, WERTHIMER & DONNELLY SERENDIP III SITE ARECIBO INSTR. SIZE (M) 305 SEARCH FREQ. (MHz) 424 - 436 FREQ. RES. (Hz) 0.6 OBJECTS SURVEY OF 30% OF SKY FLUX LIMITS (W/m 2 ) 5 x 10 -25 TOTAL HOURS CONTINUING REFERENCE 50 COMMENTS 4 million channels are under observation. Commensal search occurring at twice sidereal rate in backwards direction while radio astronomers track targets using the feeds and receivers on carriagehouse 1.

DATE 1993 OBSERVER(S) JUGAKU, NOGUCHI & NISHIMURA SITE INFRARED TELESCOPE OF INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE, JAPAN AND INFRARED TELESCOPE AT XINGLONG STATION OF THE BEIJING ASTRONOMICAL OBSERVATORY INSTR. SIZE (M) 1.3 and 1.26 SEARCH FREQ. (MHz) K BAND 2.2 and IRAS 12 MICRON FLUX FREQ. RES. (Hz) OBJECTS 180 SOLAR-TYPE STARS FLUX LIMITS (W/m 2 ) TOTAL HOURS REFERENCE 57 COMMENTS Searched for 12 excess radiation from IRAS catalog stars by using K-[12] color index in attempt to find Dyson Spheres.

DATE 1993 OBSERVER(S) STEFFES & DeBOER SITE NRAO/TUCSON INSTR. SIZE (M) 12 SEARCH FREQ. (MHz) 203 x 10 3 FREQ. RES. (Hz) 32 OBJECTS 40 STARS + 3 LOCATIONS NEAR GALACTIC CENTER FLUX LIMITS (W/m 2 ) 2.3 x 10 -19 TOTAL HOURS 25 REFERENCE 48 COMMENTS No artificial signals detected near positronium line.

DATE 1993 - 1995 OBSERVER(S) LEMARCHAND ET AL. META II TARGET SEARCH SITE INSTITUTO ARGENTINO DE RADIOASTRONOMIA (IAR) INSTR. SIZE (M) 30 SEARCH FREQ. (MHz) 1420 FREQ. RES. (Hz) 0.05 OBJECTS TARGETED SEARCH < 8 - 10 FLUX LIMITS (W/m 2 ) 1 x 10 -24 TOTAL HOURS 290 REFERENCE 58 COMMENTS All * < 5 pc and solar type * -> 50 ly yr. 80 stars total.

DATE 1994 OBSERVER(S) MAUERSBERGER, WILSON, ROOD, BANIA, HEIN & LINHART SITE IRAM/PICO VELETA INSTR. SIZE (M) 30 SEARCH FREQ. (MHz) 203000 FREQ. RES. (Hz) 1 MHz and 9.7 kHz OBJECTS 16 STARS + GALACTIC CENTER FLUX LIMITS (W/m 2 ) 0.2 - 20 x 10 15 W EIRP TOTAL HOURS ~5 REFERENCE 55 COMMENTS Search at Positronium line towards nearby stars and stars with IR excess that might be Dyson spheres.

DATE 1995 OBSERVER(S) GRAY SITE NRAO/VLA INSTR. SIZE (M) 27-ELEMENT ARRAY of 26M ANTENNAS SEARCH FREQ. (MHz) 1420 FREQ. RES. (Hz) 6104 (B = 781 kHz) & 381 (B = 195 kHz) OBJECTS OSU WOW LOCALE FLUX LIMITS (W/m 2 ) 10 & 100 mJy/beam/channel TOTAL HOURS 4 REFERENCE COMMENTS Search of the OSU WOW locale with 4 arcsec synthesized beam.

DATE 1995 OBSERVER(S) NORRIS (PHOENIX COOPERATIVE SCIENCE) SITE ATNF/PARKES and MOPRA INSTR. SIZE (M) 64 and 22 SEARCH FREQ. (MHz) 1200 to 3000 FREQ. RES. (Hz) 1 OBJECTS GALACTIC CENTER FLUX LIMITS (W/m 2 ) 1.3 x 10 -25 TOTAL HOURS 24 REFERENCE COMMENTS Galactic Center searched for beacon.

DATE 1995 OBSERVER(S) SETI INSTITUTE PROJECT PHOENIX SITE ATNF/PARKES and MOPRA INSTR. SIZE (M) 64 and 22 SEARCH FREQ. (MHz) 1200 - 3000 FREQ. RES. (Hz) 1 OBJECTS 206 STARS, 1200 - 1750 MHz 105 STARS, 1750 - 3000 MHz FLUX LIMITS (W/m 2 ) 1.32 x 10 -25 FOR HALF of 1750 - 3000 MHz OBSERVATIONS. 1.82 x 10 -25 FOR ALL OTHER OBSERVATIONS TOTAL HOURS 2600 REFERENCE 52, 53 COMMENTS Continuation of NASA HRMS targeted search of nearby stars, using real-time data reduction.  Immediate two-site, "pseudo-interferometric" follow-up observations of candidate signals.  Targets were solar-type stars visible only from southern hemisphere.  No detection of non-human technology.

DATE 1995 OBSERVER(S) SHOSTAK, EKERS, and VAILE (PHOENIX COOPERATIVE SCIENCE) SITE ATNF/PARKES INSTR. SIZE (M) 64 SEARCH FREQ. (MHz) 1200-1750 FREQ. RES. (Hz) 1 OBJECTS 3 FIELDS IN THE SMC FLUX LIMITS (W/m 2 ) 1.9 x10 -25 TOTAL HOURS 24 REFERENCE 59 COMMENTS Search of > 10 7 stars contained within the three fields of the SMC. Limit on detectable transmitters of 1.5x10 18 W EIRP.

DATE 1995 OBSERVER(S) SULLIVAN, WELLINGTON, SHOSTAK, BACKUS, AND CORDES (PHOENIX COOPERATIVE SCIENCE) SITE ATNF/PARKES INSTR. SIZE (M) 64 SEARCH FREQ. (MHz) 1420 +/- 5 FREQ. RES. (Hz) 1 OBJECTS GALACTIC CENTER AND 5 HIGH STRIP +/-15LONGITUDE ALONG GALACTIC PLANE FLUX LIMITS (W/m 2 ) 1.5 - 10 x 10 -25 TOTAL HOURS 48 REFERENCE 60 COMMENTS Multiple 30-second observations of strip along Galactic Plane and the Galactic Center, looking for repetitive signals.

DATE 1995 OBSERVER(S) TE LINTEL HEKKERT AND TARTER (PHOENIX COOPERATIVE SCIENCE) SITE ATNF/PARKES and MOPRA INSTR. SIZE (M) 64 and 22 SEARCH FREQ. (MHz) 1200 to 3000 FREQ. RES. (Hz) 1 OBJECTS 4 POTENTIAL DYSON SPHERES FLUX LIMITS (W/m 2 ) 1.9 x 10 -25 TOTAL HOURS 48 REFERENCE COMMENTS Candidate Dyson Sphere selection criteria: IRAS PSC sources with temperatures from 300-500K, that were not identified in OH/IR or CO(1-0) surveys, and had galactic latitudes > 5.

DATE 1995 OBSERVER(S) ZADNIK ET AL. (PHOENIX COOPERATIVE SCIENCE) SITE ATNF/PARKES INSTR. SIZE (M) 64 SEARCH FREQ. (MHz) 4462, 4532, 8295, 8393, 8666 FREQ. RES. (Hz) 1 OBJECTS 49 STARS CLOSER THAN 11.5 pc FLUX LIMITS (W/m 2 ) 3.5 AND 5.0 Jy TOTAL HOURS 48 REFERENCE 61 COMMENTS Magic Frequency search at p*HI, e*OH, 2p*HI, e*(OH + H), 3 H e

DATE 1995 - 1998 OBSERVER(S) BROWN, KLEIN & DIXON SITE OSURO INSTR. SIZE (M) 53 SEARCH FREQ. (MHz) 1423 +/- 1.25 FREQ. RES. (Hz) 0.6 OBJECTS ALL SKY SEARCH FLUX LIMITS (W/m 2 ) UNKNOWN AS YET TOTAL HOURS 5,000 REFERENCE COMMENTS Using SERENDIP processor. Have searched declinations +8 to -36. Program ended when OSU sold observatory site to golf course developer.

DATE 1995 - 1998 OBSERVER(S) KINGSLEY SITE COLUMBUS OPTICAL SETI OBSERVATORY, OHIO INSTR. SIZE (M) 0.25 SEARCH FREQ. (MHz) 0.55 MICRONS FREQ. RES. (Hz) OBJECTS NEARBY SOLAR-TYPE STARS FLUX LIMITS (W/m 2 ) TRANSMITTERS WITH PEAK INSTANTANEOUS POWER > 10 18 W TOTAL HOURS REFERENCE 70 COMMENTS Broadband optical search for short pulses (~1 nanosecond) that instantaneously outshine the host star.

DATE 1995 - ON OBSERVER(S) HOROWITZ ET AL. (BETA) SITE OAK RIDGE OBSERVATORY INSTR. SIZE (M) 26 SEARCH FREQ. (MHz) 1400 - 1720 FREQ. RES. (Hz) 0.5 OBJECTS SKY SURVEY FROM -30° to + 60° DECLINATION FLUX LIMITS (W/m 2 ) 2.2 x 10 -22 TOTAL HOURS SUSPENDED IN SPRING 1999 REFERENCE 62 COMMENTS Waterhole search, using dual-beams and omni antenna to discriminate against RFI. Project BETA (Billion channel ExtraTerrestrial Assay) is follow-on to META. Project interrupted when wind blew antenna off its mount. Repairs are under way.

DATE 1995 - ON OBSERVER(S) SETI LEAGUE PROJECT ARGUS SITE MULTIPLE SITES WORLD-WIDE (CURRENTLY ~100) INSTR. SIZE (M) ~3 - 10 (SATELLITE TV DISHES) SEARCH FREQ. (MHz) 1420 - 1720 FREQ. RES. (Hz) 1 OBJECTS ALL SKY FLUX LIMITS (W/m 2 ) ~ 1 x 10 -21 (VARIES) TOTAL HOURS ONGOING REFERENCE 76 COMMENTS Plan to organize up to 5000 radio amateurs to provide continuous sky coverage for strong, transient signals using systems that can be bought and built by individuals. SETI League currently has 1257 members running 105 sites in 19 countries.

DATE 1996 OBSERVER(S) BIRAUD AND AIRIEAU SITE NANCAY OBSERVATORY INSTR. SIZE (M) 40 x 240 SEARCH FREQ. (MHz) 1420 +/- 0.3 and 1660 +/- 2.2 FREQ. RES. (Hz) 50 OBJECTS 4 STARS WITH GIANT PLANETS (51 Peg, 47 UMa, 70 Vir, Gl 229) FLUX LIMITS (W/m 2 ) 1 x 10 -24 TOTAL HOURS 40 HOURS REFERENCE COMMENTS Search of newly discovered extrasolar planetary systems using observing protocol from Biraud and Tarter 1981-1988 SETI program at Nancay.

DATE 1996 OBSERVER(S) LOCKETT, BLAIR & ZADNIK SITE PERTH OPTICAL OBSERVATORY INSTR. SIZE (M) 1 SEARCH FREQ. (MHz) 5.24 X 10 8 = 572 NM FREQ. RES. (Hz) OBJECTS 24 NEARBY STARS FLUX LIMITS (W/m 2 ) TOTAL HOURS REFERENCE COMMENTS Search for microsecond laser pulses.

DATE 1996 - 1998 OBSERVER(S) SETI INSTITUTE PROJECT PHOENIX SITE NRAO AND WOODBURY, GA INSTR. SIZE (M) 43 AND 30 SEARCH FREQ. (MHz) 1200 - 3000 DUAL POL FREQ. RES. (Hz) 1 OBJECTS 195 STARS FLUX LIMITS (W/m 2 ) 1.3x10 -25 TOTAL HOURS 4200 REFERENCE 65 COMMENTS Continuation fo NASA HRMS targeted search of nearby stars, using real-time data reduction.  Longer observations provided same sensitivity as achieved by Project Phoenix in Australia (1995).

DATE 1996 - 1998 OBSERVER(S) TILGNER, HEINRICHSEN, KRUGER, PACHER, WALKER, WOLSTENCROFT SITE ISO (INFRARED SPACE OBSERVATORY) SATELLITE, ISOPHOT PHOTOPOLARIMETER INSTR. SIZE (M) 0.6 SEARCH FREQ. (MHz) 3 - 100 MICRONS FREQ. RES. (Hz) 0.2 MICRONS (3 MICRON FILTER BAND) 51 MICRONS (90 MICRON FILTER BAND) OBJECTS 6 SOLAR-TYPE STARS AND 1 INFRARED-EXCESS TARGET STAR FLUX LIMITS (W/m 2 ) APPROXIMATELY 30 - 90 x 10 -29 (S/N = 10) TOTAL HOURS 1.3 HOURS (GUARANTEED SCHEDULE) REFERENCE 63 COMMENTS Search for astro-engineering products like Dyson Spheres and rings by separation of their infrared spectra from that of the host star.

DATE 1996 - ON OBSERVER(S) WERTHIMER ET AL. (SERENDIP IV) SITE ARECIBO INSTR. SIZE (M) 305 SEARCH FREQ. (MHz) 1420 +/- 50 FREQ. RES. (Hz) 0.6 OBJECTS SURVEY OF 30% OF SKY VISIBLE FROM ARECIBO FLUX LIMITS (W/m 2 ) 5 x10 -24 TOTAL HOURS ONGOING REFERENCE 64 COMMENTS Commensal search occurring at twice sidereal rate in backwards direction while radio astronomers track targets using Gregorian system.

DATE 1997 - (A), 1999 (B) OBSERVER(S) BAMBI (BOB AND MIKE'S BIG INVESTMENT), SARA (SOCIETY OF AMATEUR RADIO ASTRONOMERS) MEMBERS SITE A IN CALIFORNIA, B IN COLORADO INSTR. SIZE (M) 2.6 (A); 3 (B) SEARCH FREQ. (MHz) 3700 - 4200 FREQ. RES. (Hz) 0.6 OBJECTS NORTHERN SKY SURVEY FLUX LIMITS (W/m 2 ) NO FORMAL OBSERVING PROGRAM HAS YET BEGUN TOTAL HOURS ONGOING REFERENCE 75 COMMENTS Amateur radio enthusiasts using TVRO components and software FFTs to try coordinated search.

DATE 1998 - ON OBSERVER(S) HOROWITZ ET AL. (HARVARD OPTICAL SETI) SITE OAK RIDGE OBSERVATORY INSTR. SIZE (M) 1.5 SEARCH FREQ. (MHz) 350 - 700 nm FREQ. RES. (Hz) NONE OBJECTS 13000 SOLAR-TYPE STARS OF WHICH 4000 OBSERVED TO DATE FLUX LIMITS (W/m 2 ) 4 x 10 -9 PEAK IN < 5 ns PULSE, OR 4 x 10 -20 AVERAGE PER 500 SECOND OBSERVATION TOTAL HOURS ONGOING REFERENCE 72 COMMENTS Search for nanosecond laser pulses, with hybrid avalanche photodiodes in coincidence. Piggybacks on nightly searches for extrasolar planets. Soon to be operated in coincidence with cloned detector on 0.9 m telescope at Princeton.

DATE 1998 - ON OBSERVER(S) MARCY, REINES, BUTLER, VOGT SITE LICK, KECK INSTR. SIZE (M) 10 SEARCH FREQ. (MHz) 400 - 500 nm FREQ. RES. (Hz) RESOLVING POWER = 50,000 OBJECTS 600 FGK STARS WITHIN 100 pc FLUX LIMITS (W/m 2 ) 1 x 10 -13 TOTAL HOURS 500 REFERENCE 74 COMMENTS Search through archival data for narrowband continuous optical laser emission lines.

DATE 1998 - ON OBSERVER(S) SETI AUSTRALIA SOUTHERN SERENDIP SITE PARKES INSTR. SIZE (M) 64 SEARCH FREQ. (MHz) 1420.405 +/- 8.82 FREQ. RES. (Hz) 0.6 OBJECTS SOUTHERN SKY SURVEY FLUX LIMITS (W/m 2 ) 4 x 10 -24 TOTAL HOURS ONGOING REFERENCE 67 COMMENTS Comensal search that uses 2 out of 13 beams of Parkes focal plane anrray to discriminate against RFI.

DATE 1998 - 2004 OBSERVER(S) SETI INSTITUTE PROJECT PHOENIX SITE ARECIBO OBSERVATORY AND LOVELL TELESCOPE AT JODRELL BANK INSTR. SIZE (M) 305 and 76 SEARCH FREQ. (MHz) 1200 TO 3000 DUAL POL FREQ. RES. (Hz) 1 OBJECTS 290 STARS, 1200 - 1750 HHz; 371 STARS, 1750 - 3000 MHz FLUX LIMITS (W/m 2 ) 1.4 - 2.4  x 10 -26 TOTAL HOURS 2400 REFERENCE 66 COMMENTS Continuation of NASA HRMS targeted search of nearby stars, using real-time data reduction.  For observations in the 1200-1750 MHz range, "pseudo-interferometric" observations using Arecibo and Jodrell Bank helped discriminate against RFI.

DATE 1998 - ON OBSERVER(S) WERTHIMER SITE LEUSCHNER OBSERVATORY INSTR. SIZE (M) 0.8 SEARCH FREQ. (MHz) 300-650 nm FREQ. RES. (Hz) NONE OBJECTS 800 SOLAR-TYPE STARS FLUX LIMITS (W/m 2 ) 1.5 x 10 -9 PEAK DURING 1ns PULSE, OR 1.5 X 10-20 AVERAGE PER 100 SECOND OBSERVATION TOTAL HOURS 200 (ONGOING) REFERENCE 71 COMMENTS First optical search to use two high time resolution photomultiplier tubes in coincidence to look for nanosecond pulses.

DATE 1999 - ON OBSERVER(S) WERTHIMER AND ANDERSON (SETI@HOME) SITE ARECIBO INSTR. SIZE (M) 305 SEARCH FREQ. (MHz) 1420.405 +/- 1.25 MHz FREQ. RES. (Hz) 0.6 Hz OBJECTS DATA TAKEN FROM SERENDIP IV - SKY VISIBLE FROM ARECIBO FLUX LIMITS (W/m 2 ) 5 x 10 -25 TOTAL HOURS ONGOING REFERENCE 68 COMMENTS Hugely successful experiment in distributed computing.  Permits more sophisticated processing of a fraction of SERENDIP IV data by harnessing idle CPU cycles of 3 million personal and corporate computers.