SPACEWARN BULLETIN, SPX-493 A publication of NASA NSSDC/WDC-A-R&S, as the WWAS for IUWDS/COSPAR 25 November 1994 (All information in this publication was received between October 25, 1994, and November 24, 1994.) A. List of New International Designations and Launch Dates. (USSPACECOM Catalog numbers are in parentheses.) 1994-076C (23398) COSMOS 2296 Nov 20 -076B (23397) COSMOS 2295 Nov 20 -076A (23396) COSMOS 2294 Nov 20 -075A (23348) PROGRESS M-25 Nov 11 -074A (23342) RESURS-01 Nov 04 -073B (23341) CRISTA-SPAS Nov 04 -073A (23340) STS 66 Nov 03 -072A (23336) COSMOS 2293 Nov 02 -071A (23333) WIND Nov 01 -070A (23331) ASTRA 1-D Nov 01 -069A (23327) ELECTRO Oct 31 B. Text of Launch Announcements. 1994-076C, COSMOS 2296, COSMOS 2295, and COSMOS 2294 are the three 076B,076A latest additions to the Russian fleet of global positioning spacecraft (GLONASS) and were launched by a Proton-K rocket from Baykonur cosmodrome at 00:09 UT. The fleet now totals 21 spacecraft plus a reserve; three more spacecraft that are to be launched in 1995 will complete the constellation of 24 spacecraft. The GLONASS series enables position measurement at land or sea within an error of 100 meters. Initial orbital parameters were period 2 hr, apogee/perigee 19,000 km, and inclination 71 deg. (The three spacecraft will be listed in section C-3 of a later issue after additional data can be procured.) 1994-075A PROGRESS M-25, a Russian automatic cargo ship, was launched from Baykonur cosmodrome by a Soyuz-U rocket and headed to dock with the MIR space station to provide supplies to the station. The cargo ship carried more than two tons of supplies and a returnable RADUGA capsule to bring back about 150 kg of experimental results from MIR. Initial orbital parameters were period 92.4 min, apogee 394 km, perigee 342 km, and inclination 51.6 deg. 1994-074A RESURS-01, a Russian natural resources spacecraft, was launched from Baykonur cosmodrome by a Zenit-2 rocket at 05:46 UT in a Sun-synchronous orbit. This is the third of the RESURS-01 series, and a likely alternative name may be RESURS 1-3. Initial orbital parameters were period 98 min, apogee 691.4 km, perigee 663.8 km, and inclination 98 deg. 1994-073B CRISTA-SPAS, a German spacecraft, was released from STS 66 on 4 November 1994 and captured back on 12 November 1994. It carried spectraphotometers to monitor gases in the middle atmosphere and lower thermosphere. Orbital parameters were close to those of STS 66. 1994-073A STS 66, a U.S.A. shuttle spacecraft, was launched from Cape Canaveral at 06:59 UT. The primary payload was the ATLAS 3 laboratory containing two instruments (SOLCON and SOLSPEC) to measure solar emissions in the visible and UV bands, and a UV backscatter monitor to measure ozone concentrations. The shuttle also carried many pregnant and nonpregnant rats for biological studies. Initial orbital parameters were period 90.6 min, apogee 310 km, perigee 296 km, and inclination 57 deg. 1994-072A COSMOS 2293, a Russian military spacecraft, was launched by a Tsiklon-2 rocket. The initial orbital parameters were period 92.7 min, apogee 436 km, perigee 412 km, and inclination 65 deg. 1994-071A WIND is a U.S.A. spacecraft in the International Solar-Terrestrial Program (ISTP) and was launched by a Delta-2 rocket from Cape Canaveral at 23:31 UT. It carried instruments to measure the solar wind plasma and magnetic field, besides several instruments to measure very energetic particles and gamma rays. After several orbits extending to close proximity of the Moon (at about 60 Earth-radii) and involving several thrust-firings during that phase, the spacecraft will eventually reach the first Lagrangian point (L-1) located at about 275 Earth-radii in the Sun-ward direction and orbit around that point. Orbital parameters are very variable even during the first two years. 1994-070A ASTRA 1-D is a geostationary spacecraft of the European Space Society that was launched by an Ariane 42P rocket from Kourou in French Guiana at 00:37 UT to provide direct TV and radio broadcast to most of Europe after reaching the parking longitude of 19.2 E. It carried 18 transponders. 1994-069A ELECTRO is a Russian geostationary weather spacecraft that was launched from Baykonur cosmodrome by a Proton rocket. It will provide cloud cover and sea temperature maps, along with the data on the upper boundaries of clouds and wind speeds, to enable hurricane, floods, and typhoon warnings. It will be parked at 76-E longitude over the Indian Ocean just south of India. C. Spacecraft Particularly Suited for International Participation (Category I). 1. Spacecraft with essentially continuous radio beacons on frequencies less than 150 MHz, or higher frequencies if especially suited for ionospheric or geodetic studies. ("NNSS" denotes U.S. Navy Navigational Satellite System; an asterisk [*] indicates updated/new information since the last issue. Updates or corrections to the list will be most welcomed.) Designations, Epoch, Frequency, Power, National Name and Orbit Information Remarks 1964-83D (965) February 1, 1993 TRANSIT 5BN 5 136.65 MHz Inclination: 89.76 deg 1966-110A (02608) June 16, 1988 [Weak signals. VHF translator ATS 1 137.35 MHz on ~12 hr/day.] Inclination: 14.0 deg 1967-111A (03029) June 16, 1988 [Weak signals.] ATS 3 136.37 MHz 137.35 MHz Location: 105 deg W Inclination: 12.1 deg 1971-93A (5580) February 1, 1993 X 3 137.56 MHz Inclination: 82.05 deg 1973-081A (06909) September 15, 1988 [Operational transit. OSCAR (NAV) 20 150 MHz at 0.75 W Also known as NNSS 30200.] 400 MHz at 1.25 W Inclination: 89.9 deg 1975-100A (08366) June 29, 1991 GOES 1 136.38 MHz Location: 81.2 deg W Inclination: 10.5 deg 1977-048A (10061) October 24, 1993 GOES 2 136.38 MHz Location: 135.95 deg W Inclination: 9.4 deg 1978-012A (10637) December 26, 1991 IUE 136.86 MHz Inclination: 33.201 deg 1978-062A (10953) October 24, 1993 [Frequency drifts caused by GOES 3 136.38 MHz temperature variations.] Location: 176.2 deg W Inclination: 8.0 deg 1981-044A (12458) March 4, 1991 [Stored in orbit at NOVA I 150 MHz at 3.00 W maintenance frequency. 400 MHz at 5.00 W Also known as NNSS 30480.] Inclination: 90.0 deg 1981-122A (13010) March 21, 1993 MARECS-A 137.17 MHz Location: 22.8 deg E Inclination: 5.7 deg 1984-110A (15362) December 24, 1992 [Operational transit. NOVA III 150 MHz at 3.00 W Also known as NNSS 30500.] 400 MHz at 5.00 W Inclination: 90.0 deg 1984-114B (15386) March 21, 1993 MARECS-B2 137.17 MHz Location: 14.9 deg W Inclination: 3.6 deg 1984-123A (15427) October 28, 1994 NOAA 9 137.62 MHz 137.77 MHz Inclination: 99.158 deg 1985-066B (15936) February 26, 1991 [Stored in orbit at OSCAR (NAV) 30 150 MHz at 1.00 W maintenance frequency. 400 MHz at 2.00 W Also known as NNSS 30300.] Inclination: 89.9 deg 1986-017A (16609) October 27, 1991 MIR 145.550 MHz Inclination: 51.604 deg 1986-073A (16969) October 28, 1994 NOAA 10 137.50 MHz 136.77 MHz Inclination: 98.549 deg 1986-088A (17070) September 15, 1988 [Experimental. POLAR BEAR 150 MHz at 0.75 W Also known as NNSS 30170.] 400 MHz at 1.25 W Inclination: 89.9 deg 1987-18A (17527) February 1, 1993 MOS 1A 136.11 MHz Inclination: 99.09 deg 1987-054A (18129) October 27, 1991 COSMOS 1861 29.357 MHz 29.403 MHz 29.407 MHz Inclination: 82.926 deg 1987-080A (18361) December 5, 1988 [Operational transit. OSCAR (NAV) 27 150 MHz at 0.75 W Also known as NNSS 30270.] 400 MHz at 1.25 W Inclination: 90.3 deg 1987-080B (18362) February 7, 1991 [Operational transit. OSCAR (NAV) 29 150 MHz at 0.75 W Also known as NNSS 30290.] 400 MHz at 1.25 W Inclination: 90.3 deg 1988-033A (19070) January 31, 1989 [Operational transit. OSCAR (NAV) 23 150 MHz at 0.75 W Also known as NNSS 30230.] 400 MHz at 1.25 W Inclination: 90.4 deg 1988-033B (19071) February 26, 1991 [Operational transit. OSCAR (NAV) 32 150 MHz at 1.00 W Also known as NNSS 30320.] 400 MHz at 2.00 W Inclination: 90.4 deg 1988-051A (19215) March 31, 1993 [Transmits on command.] METEOSAT 3 137.080 MHz Location: 72.8 deg W Inclination: 0.7 deg 1988-052A (19223) September 15, 1988 [Operational transit. NOVA II 150 MHz at 3.00 W Also known as NNSS 30490.] 400 MHz at 5.00 W Inclination: 90.0 deg 1988-074A (19419) September 15, 1988 [Stored in orbit at an OSCAR (NAV) 25 150 MHz at 0.75 W offset frequency. 400 MHz at 1.25 W Also known as NNSS 30250. Inclination: 90.0 deg 1988-074B (19420) March 8, 1990 [Stored in orbit at an OSCAR (NAV) 31 150 MHz at 1.00 W offset frequency. 400 MHz at 2.00 W Also known as NNSS 30310.] Inclination: 98.971 deg 1988-089A (19531) October 28, 1994 NOAA 11 137.62 MHz 137.77 MHz Inclination: 99.059 deg 1990-13A (20478) February 1, 1993 MOS 1B 136.11 MHz Inclination: 99.09 deg 1990-017A (20508) August 6, 1994 [INACTIVE. Replaced by NADEZHDA 2 150 MHz NADEZHDA 4.] 400 MHz Inclination: 82.955 deg 1990-086A (20826) October 27, 1991 METEOR 2-20 137.850 MHz Inclination: 82.530 deg 1991-06A (21087) January 1, 1993 INFORMATOR 1 145.815 MHz Inclination: 82.94 deg 1991-86E (21835) February 1, 1993 MAGION 3 137.85 MHz Inclination: 82.57 deg 1991-007A (21089) July 18, 1991 COSMOS 2123 150 MHz 400 MHz Inclination: 82.923 deg 1991-019A (21152) July 18, 1991 NADEZHDA 3 150 MHz 400 MHz Inclination: 82.929 deg 1991-030A (21232) October 27, 1991 METEOR 3-4 137.300 MHz Inclination: 82.548 deg 1991-032A (21236) October 28, 1994 NOAA 12 137.500 MHz 136.770 MHz Inclination: 98.723 deg 1991-081A (21796) December 6, 1993 [INACTIVE. COSMOS 2173 149.97 MHZ Replaced by COSMOS 2239.] 388.84 MHz Inclination: 82.955 deg 1992-008A (21875) May 25, 1994 [INACTIVE. COSMOS 2180 149.94 MHz Replaced by COSMOS 2279.] 399.84 MHz Inclination: 82.931 deg 1992-020A (21937) December 24, 1992 COSMOS 2184 149.91 MHz 399.76 MHz Inclination: 82.934 deg 1992-036A (22006) December 6, 1993 [INACTIVE. Replaced by COSMOS 2195 149.97 MHz reactivated COSMOS 2135 on 399.92 MHz August 3, 1993.] Inclination: 82.934 deg 1992-073A (22207) November 3, 1992 [Replacing 1991-059A, COSMOS 2218 149.94 MHz COSMOS 2154, in plane #3 399.84 MHz on November 4, 1992.] Inclination: 82.923 deg 1993-001A (22307) January 1, 1993 [Replacing 1992-12A, COSMOS COSMOS 2230 150.00 MHz 2181, in plane #11 on 400.00 MHz January 20, 1993.] Inclination: 82.945 deg 1993-008A (22487) February 18, 1993 [Replacing 1991-029A, COSMOS COSMOS 2233 150.03 MHz 2142, in plane #5 on February 400.08 MHz 17, 1993.] Inclination: 82.944 deg 1993-020A (22590) December 6, 1993 [Replacing 1991-081A, COSMOS COSMOS 2239 149.97 MHz 2173, in plane #4 on April 7, 399.84 MHz 1993.] Inclination: 82.93 deg 1993-070A (22888) December 6, 1993 [Replacing 1991-59A, COSMOS COSMOS 2266 149.97 MHz 2135, in plane #1 on November 399.84 MHz 10, 1993.] Inclination: 82.95 deg 1994-024A (23092) May 25, 1994 [Replacing 1992-08A, COSMOS 2279 149.94 MHz COSMOS 2180, in plane #6 399.84 MHz on May 11, 1994.] Inclination: 82.946 deg 1994-041A (23179) July 16, 1994 [Replacing NADEZHDA, NADEZHDA 4 150.00 MHz 1990-017A, in plane #14 400.00 MHz on July 28, 1994.] Inclination: 82.946 deg 2. Global Positioning System satellites useful for navigational purposes and geodetic studies. ("NNN" denotes no national name. SPACEWARN Bulletin appreciates suggestions to update this list. An asterisk [*] denotes changes in this issue.) Designations, Epoch, Frequency, National Name and Orbit Information Remarks 1984-097A (15271) September 9, 1991 [Also known as NAVSTAR 10 and USA 5 1575.42 MHz GPS 10. PRN: 12.] 1227.60 MHz Inclination: 62.973 deg 1985-093A (16129) October 28, 1994 [Also known as NAVSTAR 11 USA 10 1575.42 MHz and GPS 11. PRN: 3.] 1227.60 MHz DEACTIVATED ON 13 April 1994. Inclination: 64.115 deg 1989-013A (19802) August 17, 1991 [Also known as GPS 2-1 USA 35 1575.42 MHz (Second Generation Global 1227.60 MHz Positioning Satellite) and Inclination: 55.033 deg NAVSTAR 14. PRN: 14.] 1989-044A (20061) August 19, 1991 [Also known as GPS 2-2 and USA 38 1575.42 MHz NAVSTAR 13. PRN: 2.] 1227.60 MHz Inclination: 54.937 deg 1989-064A (20185) July 9, 1991 [Also known as GPS 2-3 and USA 42 1575.42 MHz NAVSTAR 16. PRN: 16.] 1227.60 MHz Inclination: 54.873 deg 1989-085A (20302) August 26, 1994 [Also known as GPS 2-4 and USA 47 1575.42 MHz NAVSTAR 19. PRN: 19.] 1227.60 MHz Inclination: 54.368 deg 1989-097A (20361) August 26, 1994 [Also known as GPS 2-5 and USA 49 1575.42 MHz NAVSTAR 17. PRN: 17.] 1227.60 MHz Inclination: 55.058 deg 1990-008A (20452) August 23, 1991 [Also known as GPS 2-6 USA 50 1575.42 MHz and NAVSTAR 18. PRN: 18.] 1227.60 MHz Inclination: 54.329 deg 1990-025A (20533) August 26, 1994 [Also known as GPS 2-7 and USA 54 1575.42 MHz NAVSTAR 20. PRN: 20.] 1227.60 MHz Inclination: 55.202 deg 1990-068A (20724) August 23, 1991 [Also known as GPS 2-8 USA 63 1575.42 MHz and NAVSTAR 21. PRN: 21.] 1227.60 MHz Inclination: 54.671 deg 1990-088A (20830) August 24, 1991 [Also known as GPS 2-9 USA 64 1575.42 MHz and NAVSTAR 15. PRN: 15.] 1227.60 MHz Inclination: 54.984 deg 1990-103A (20959) September 4, 1994 [Also known as GPS 2-10, USA 66 1575.42 MHz GPS 2A-1, and NAVSTAR 23. 1227.60 MHz PRN: 23.] Inclination: 54.893 deg 1991-047A (21552) September 4, 1994 [Also known as GPS 2-11, USA 71 1575.42 MHz GPS 2A-2, and NAVSTAR 24. 1227.60 MHz PRN: 24.] Inclination: 55.275 deg 1992-009A (21890) September 4, 1994 [Also known as GPS 2-12, USA 79 1575.42 MHz GPS 2A-3, and NAVSTAR 25. 1227.60 MHz PRN: 25.] Inclination: 55.57 deg 1992-019A (21930) September 4, 1994 [Also known as GPS 2-13, USA 80 1575.42 MHz GPS 2A-4, and NAVSTAR 28. 1227.60 MHz PRN: 28.] Inclination: 55.24 deg 1992-039A (22014) September 4, 1994 [Also known as GPS 2-14, USA 83 1575.42 MHz GPS 2A-5, and NAVSTAR 26. 1227.60 MHz PRN: 26.] Inclination: 55.04 deg 1992-058A (22108) September 4, 1994 [Also known as GPS 2-15, USA 84 1575.42 MHz GPS 2A-6,and NAVSTAR 27. 1227.60 MHz PRN: 27.] Inclination: 54.78 deg 1992-079A (22231) September 4, 1994 [Also known as GPS 2-16, USA 85 1575.42 MHz GPS 2A-7, and NAVSTAR 32. 1227.60 MHz PRN: 1.] Inclination: 53.50 deg 1992-089A (22275) September 4, 1994 [Also known as GPS 2-17, USA 87 1575.42 MHz GPS 2A-8,and NAVSTAR 29. 1227.60 MHz PRN: 29.] Inclination: 54.74 deg 1993-007A (22446) September 4, 1994 [Also known as GPS 2-18, USA 88 1575.42 MHz GPS 2A-9, and NAVSTAR 22. 1227.60 MHz PRN: 22.] Inclination: 54.83 deg 1993-017A (22581) September 4, 1994 [Also known as GPS 2-19, USA 90 1575.42 MHz GPS 2A-10, and NAVSTAR 31. 1227.60 MHz PRN: 31.] Inclination: 54.80 deg 1993-032A (22657) September 4, 1994 [Also known as GPS 2-20, USA 91 1575.42 MHz GPS 2A-11, and NAVSTAR 37. 1227.60 MHz PRN: 7.] Inclination: 54.97 deg 1993-042A (22700) September 4, 1994 [Also known as GPS 2-21, USA 92 1575.42 MHz GPS 2A-12, and NAVSTAR 39. 1227.60 MHz PRN: 9.] Inclination: 54.70 deg 1993-054A (22779) September 4, 1994 [Also known as GPS 2-22, USA 94 1575.42 MHz GPS 2A-13, and NAVSTAR 35. 1227.60 MHz PRN: 5.] Inclination: 54.90 deg 1993-068A (22877) August 26, 1994 [Also known as GPS 2-23, USA 96 1575.42 MHz GPS 2A-14,and NAVSTAR 34. 1227.60 MHz PRN: 4] Inclination: 54.90 deg 1994-016A (23027) August 26, 1994 [Also known as GPS 2-24, USA 100 1575.42 MHz GPS 2A-15,and NAVSTAR 36. 1227.60 MHz PRN: 6] The GPS 2-NN series orbit in six distinct planes that are 60 deg apart. Each plane has four "slots." Following are the members of the planes/slots. The RAAN pertains to August 1994 and reduces a little each month. PLANE RAAN OF PLANE SLOT-1 SLOT-2 SLOT-3 SLOT-4 A 256 2-21 2-12 2-15 2-04 B 316 2-18 2-07 2-02 2-22 C 16 2-24 2-13 2-19 2-20 D 76 2-11 2-09 2-05 2-23 E 136 2-01 2-08 2-03 2-10 F 196 2-16 2-14 2-06 2-17 3. Russian Global Navigational (Positioning) Spacecraft, GLONASS constellation. (SPACEWARN requests updates/additions from readers to this list. "*" marked entries are updates or additions to the list.) All GLONASS spacecraft are in the general COSMOS series; GLONASS 1 through 48, 50, 52, 53, 58, and 59 are inoperational or not in service. The COSMOS numbers may occasionally differ from the numbers associated in Russia. The operating frequency in MHz is computed from the channel number K. Frequency (MHz) = 1602.0 + 0.5625K. 1990-110C (21008) October 31, 1994 Also known as GLONASS 49. COSMOS 2111 Channel: 23 Inclination: 64.96 RAAN: 107.5; Plane: 1 1991-025B (21217) October 31, 1994 Also known as GLONASS 50. COSMOS 2140 Channel: 11 Inclination: 65.08 RAAN: 346.8; Plane: 3 1992-005B (21854) October 31, 1994 Also known as GLONASS 54. COSMOS 2178 Channel: 02 Inclination: 64.91 RAAN: 107.2; Plane: 1 1992-005C (21855) October 31, 1994 Also known as GLONASS 55. COSMOS 2179 Channel: 23 Inclination: 64.92 RAAN: 107.1; Plane: 1 1992-047A (22056) October 31, 1994 Also known as GLONASS 56. COSMOS 2204 Channel: 01 Inclination: 64.93 RAAN: 347.0; Plane: 3 1992-047B (22057) October 31, 1994 Also known as GLONASS 57. COSMOS 2205 Channel: 24 Inclination: 64.93 RAAN: 347.1; Plane: 3 1993-010B (22513) October 31, 1994 Also known as GLONASS 60. COSMOS 2235 Channel: 05 Inclination: 64.92 RAAN: 107.1; Plane: 1 1993-010C (22514) October 31, 1994 Also known as GLONASS 61. COSMOS 2236 Channel: 21 Inclination: 64.94 RAAN: 107.0; Plane: 1 1994-021A (23043) Channel: 24 Also known as GLONASS 62. COSMOS 2275 Inclination: 64.81 RAAN: 347.4; Plane: 3 1994-021B (23044) October 31, 1994 Also known as GLONASS 63. COSMOS 2276 Channel: 03 Inclination: 64.81 RAAN: 347.4; Plane: 3 1994-021C (23045) October 31, 1994 Also known as GLONASS 64. COSMOS 2277 Channel: 10 Inclination: 64.80 RAAN: 347.4; Plane: 3 1994-050A (23203) October 31, 1994 Also known as GLONASS 65. COSMOS 2287 Channel: 22 Inclination: 64.85 RAAN: 226.8; Plane: 2 1994-050B (23204) October 31, 1994 Also known as GLONASS 66. COSMOS 2288 Channel: 22 Inclination: 64.91 RAAN: 226.8; Plane: 2 1994-050C (23205) October 31, 1994 Also known as GLONASS 67. COSMOS 2289 Channel: 09 Inclination: 64.84 RAAN: 226.8; Plane: 2 4. Actual decays/landings of payload spacecraft and rocket bodies (R/B) only. No further information is available. Designations Common Name 1994 1994-076D (23399) R/B COSMOS 2294, 2295, 2296 20 Nov 1994-073A (23340) STS 66 Landed on 14 Nov 1994-075B (23349) R/B PROGRESS M-25 13 Nov 1994-073B (23341) CRISTA SPAS Recaptured by STS 66 12 Nov 1994-036A (23139) SOYUZ TM-19 04 Nov 1984-029A (14825) MOLNIYA 1-60 04 Nov 1994-069B (23328) R/B ELECTRO 03 Nov 1994-072B (23337) R/B COSMOS 2293 02 Nov 5. Miscellaneous Items. (This section contains information/data that are entered on occasion and may not be repeated in each issue of the SPACEWARN Bulletin.) NSSDC/WDC-A-R&S is an archival center for science data from many spacecraft. Some data are on line for electronic access. Please contact the Request Office, NSSDC, Code 633, NASA/GSFC, Greenbelt, Maryland, 20771, U.S.A., for specific information. SPACEWARN BULLETIN ------------------- This bulletin is intended to serve as an international communication mechanism for the rapid distribution of information on satellites and space probes. The material it contains is based on guidelines in "COSPAR Guide to Rocket and Satellite Information and Data Exchange," COSPAR Transactions #8, December 1972, and various Committee on Space Research (COSPAR) resolutions. The SPACEWARN Bulletin is issued to COSPAR's national contacts for satellite information, Satellite Regional Warning Centers, and various leaders and participants in COSPAR activities. Recipients are requested to arrange for any further appropriate distribution of this bulletin to interested individuals and institutions in their regions or countries. All bulletins beginning with January 1991 (SPX-447) are now available on line; the SPX number increases by one for each succeeding month (for example, the January 1993 bulletin is SPX-471). Through DECnet: at prompt type:copy nssdca::anon_dir:[active.spx]spx.471 *.* Through FTP: at prompt type: ftp nssdca.gsfc.nasa.gov at the next prompt type: anonymous at the PASSWORD (NSSDCA.GSFC.GOV.ANONYMOUS) prompt hit: return at the next prompt type: get anon_dir:[000000.active.spx]spx.471 spx.471 The Bulletin may also be accessed through World Wide Web (WWW). Users are urged to submit their comments and suggestions for the improvement of this bulletin to Spacewarn Bulletin, World Data Center-A for Rockets and Satellites, Code 930.2, Goddard Space Flight Center, Greenbelt, Maryland 20771 U.S.A. CATEGORIES OF SPACECRAFT To improve the effectiveness of international distribution of satellite and space probe information via the SPACEWARN system, spacecraft are identified in categories according to the urgency and detail of information needed by the scientific community as: CATEGORY I: Spacecraft particularly suited for international participation, especially those for which prior arrangements have been circulated through COSPAR channels: essentially continuous satellite radio beacons usually on frequencies less than 150 MHz designed for cooperative ionospheric experiments; satellites with continuous telemetry of scientific experiments. Some of these may be balloon satellites, flashing satellites, or satellites in orbits of particular interest for which optical observations from the ground constitute a scientific experiment. CATEGORY II: Space experiments of unusual general scientific or popular interest: manned space flights or space probes if not for some reason included in Category I. CATEGORY III: All other space experiments: satellites with command telemetry only, test vehicles, etc., if not included in Category I or II. The SPACEWARN Bulletin contains the following information. Please note the accompanying explanations, where appropriate, as to coverage and sources of information since this is not repeated in the text. A. List of Recent International Designations. This list continues the tables given in previous bulletins.It also confirms the tentative designations assigned by the IUWDS World Warning Agency for Satellites acting on behalf of COSPAR via telegrams distributed over the SPACEWARN system. B. Texts of Launching Announcements. This section gives the texts of launching announcements of satellites and space probes received by the IUWDS World Warning Agency for Satellites at the NSSDC/WDC-A-R&S during the previous month. C. Spacecraft Particularly Suited for International Participation (Category I). These data are based on launching announcements or on information received from individuals, launching authorities, FBIS reports, and news magazines. Also included are decays of major objects, and miscellanous items.