SPX-518 25 December 1996 SPACEWARN Activities A publication of NASA NSSDC/WDC-A-R&S and the WWAS for ISES/COSPAR (All information in this publication was received between 25 November 1996 and 24 December 1996.) A. List of New International Designations and Launch Dates (UT). (USSPACECOM Catalog numbers are in parentheses.) 1996-073A (24701) BION 11 24 Dec 1996-072A (24680) USA 129 20 Dec 1996-071A (24677) COSMOS 2336 20 Dec 1996-070A (24674) INMARSAT 3-F3 18 Dec 1996-069A (24670) COSMOS 2335 11 Dec 1996-068A (24667) MARS PATHFINDER 04 Dec 1996-067A (24665) HOT BIRD 2 21 Nov B. Text of Launch Announcements. 1996-073A Bion 11 is a Russian spacecraft that was launched from Plesetsk cosmodrome by a Soyuz-U rocket at 13:50 UT. It carries a capsule housing two monkeys and several newts, snails, beetles, fruit flies, and small plants to study their responses and behaviors under microgravity. The capsule will make a soft-landing after two weeks. The initial orbital parameters were period 90.5 min, apogee 401.1 km, perigee 225.4 km, and inclination 62.8 deg. 1996-072A USA 129 is an American military spacecraft that was launched by a Titan 4 rocket from Vandenberg AFB. 1996-071A COSMOS 2336 is a Russian military spacecraft that was launched from Plesetsk cosmodrome by a Kosmos 30M rocket at 12:44 UT. Initial orbital parameters were period 105 min, apogee 1,026 km, perigee 995 km, and inclination 83 deg. 1996-070A INMARSAT 3-F3 is a geosynchronous communications spacecraft of that international consortium to enable communications among maritime and land-based vehicles. It was launched by an Atlas rocket from Cape Canaveral. 1996-069A COSMOS 2335 is a Russian military spacecraft. Initial orbital elements were period 92.7 min, apogee 417 km, perigee 403 km, and inclination 65.4 deg. 1996-068A MARS PATHFINDER is an American planetology spacecraft that was launched by a Delta 2 rocket from Cape Canaveral at 06:58 UT. After a seven-month cruise the PATHFINDER along with a small rover named Sojourner (60 cm x 48 cm x 30 cm; 11.5 kg) it carries will land on Mars, cushioned by inflatable balloons. The landing site will be at 19.5 north latitude and 32.8 west longitude. Both the spacecraft (also known as the lander) and the rover will be solar- powered, with backup batteries. The lander houses three instruments: Imager for Mars Pathfinder (IMP), Atmospheric Structure Instrument/ METeorology package (ASI/MET); the rover houses an Alpha, Proton, X-ray Spectrometer (APXS) and color cameras. The lander has a one- gigabyte memory to store and transmit data from its instruments as well as from the instruments on the rover. More details of the mission may be obtained through the URL http://mpfwww.jpl.nasa.gov. 1996-067A HOT BIRD 2 is a European geosynchronous communications spacecraft that was launched by an Atlas rocket from Cape Canaveral. It is intended to provide direct broadcast voice and video communications to western Europe. C. Spacecraft Particularly Suited for International Participation. 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 are possible only with information from the user community.) THE FULL LIST APPEARED in SPX-513; A SMALL REVISION APPEARED IN SPX-515. THE LIST WILL APPEAR AGAIN ONLY WHEN MAJOR UPDATES ARE MADE. Mr. Geoffrey Perry, MBE, Kettering Group, Cornwall, England, has reported on 26 December 1996 the following change: 1991-081A (21796) December 6, 1993 INACTIVE. REPLACED 149.97 MHz by COSMOS 2336 on 26 December 1996 399.92 MHz Inclination: 82.955 deg 1996-073A (24677) December 20, 1996 ACTIVE in plane #4 149.97 MHz 399.92 MHz Inclination: 82.949 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. The SPACEWARN Bulletin thanks Richard Langley of the University of New Brunswick for the update.) High precision (< 20 cm) GPS constellation tracking data obtained from the network of about 80 dedicated global stations that are of interest to geodetic study may be obtained through the following services provided by the International Association of Geodesy (IGS). FTP: igscb.jpl.nasa.gov [directory /igscb] WWW: http://igscb.jpl.nasa.gov/ E-Mail: igscb@cobra.jpl.nasa.gov The standard format of the GPS information appeared in SPX-515. The following E-mail from Richard Langley may be more useful to the user community. From: SMTP%"lang@unb.ca" 7-OCT-1996 12:10:52.26 To: SARDI CC: Subj: Navstar GPS Constellation Status (96-10-07) Navstar GPS Constellation Status (96-10-07) Blk NORAD Orbit Launch II PRN Internat. Catalog Plane Date Seq SVN Code ID Number Pos'n (UT) Clock Available/Decommissioned ------------------------------------------------------------------------------- Block I 01 04 1978-020A 10684 78-02-22 78-03-29 85-07-17 02 07 1978-047A 10893 78-05-13 78-07-14 81-07-16 03 06 1978-093A 11054 78-10-06 78-11-13 92-05-18 04 08 1978-112A 11141 78-12-10 79-01-08 89-10-14 05 05 1980-011A 11690 80-02-09 80-02-27 83-11-28 06 09 1980-032A 11783 80-04-26 80-05-16 91-03-06 07 81-12-18 Launch failure 08 11 1983-072A 14189 83-07-14 83-08-10 93-05-04 09 13 1984-059A 15039 84-06-13 84-07-19 94-06-20 10 12 1984-097A 15271 84-09-08 84-10-03 95-11-18 11 03 1985-093A 16129 85-10-09 85-10-30 94-04-13 Block II II-1 14 14 1989-013A 19802 E-1 89-02-14 Cs 89-04-15 05:02 UT II-2 13 02 1989-044A 20061 B-3 89-06-10 Cs 89-08-10 20:46 UT II-3 16 16 1989-064A 20185 E-5 89-08-18 Cs 89-10-14 20:21 UT II-4 19 19 1989-085A 20302 A-4 89-10-21 Rb 89-11-23 03:13 UT II-5 17 17 1989-097A 20361 D-3 89-12-11 Cs 90-01-06 03:30 UT II-6 18 18 1990-008A 20452 F-3 90-01-24 Cs 90-02-14 22:26 UT II-7 20 20 1990-025A 20533 90-03-26 90-04-18 96-05-10 II-8 21 21 1990-068A 20724 E-2 90-08-02 Cs 90-08-22 15:00 UT II-9 15 15 1990-088A 20830 D-2 90-10-01 Cs 90-10-15 00:39 UT Block IIA II-10 23 23 1990-103A 20959 E-4 90-11-26 Cs 90-12-10 23:45 UT II-11 24 24 1991-047A 21552 D-1 91-07-04 Rb 91-08-30 04:44 UT II-12 25 25 1992-009A 21890 A-2 92-02-23 Cs 92-03-24 11:00 UT II-13 28 28 1992-019A 21930 C-5 92-04-10 Cs 92-04-25 20:32 UT II-14 26 26 1992-039A 22014 F-2 92-07-07 Cs 92-07-23 19:43 UT II-15 27 27 1992-058A 22108 A-3 92-09-09 Cs 92-09-30 20:08 UT II-16 32 01 1992-079A 22231 F-1 92-11-22 Cs 92-12-11 14:49 UT II-17 29 29 1992-089A 22275 F-4 92-12-18 Cs 93-01-05 16:39 UT II-18 22 22 1993-007A 22446 B-1 93-02-03 Cs 93-04-04 05:20 UT II-19 31 31 1993-017A 22581 C-3 93-03-30 Rb 93-04-13 20:53 UT II-20 37 07 1993-032A 22657 C-4 93-05-13 Cs 93-06-12 16:15 UT II-21 39 09 1993-042A 22700 A-1 93-06-26 Cs 93-07-20 12:54 UT II-22 35 05 1993-054A 22779 B-4 93-08-30 Cs 93-09-28 19:29 UT II-23 34 04 1993-068A 22877 D-4 93-10-26 Cs 93-11-22 18:20 UT II-24 36 06 1994-016A 23027 C-1 94-03-10 Cs 94-03-28 14:20 UT II-25 33 03 1996-019A 23833 C-2 96-03-28 Cs 96-04-09 21:17 UT II-26 40 10 1996-041A 23953 E-3 96-07-16 Rb 96-08-15 15:05 UT II-27 30 30 1996-056A 24320 B-2 96-09-12 Cs 96-10-01 15:28 UT Notes ----- 1. NORAD Catalog Number is also known as U.S. Space Command (USSPACECOM) object number. 2. No orbital plane position = satellite no longer operational. 3. Clock: Rb = Rubidium; Cs = Cesium. 4. Selective Availability (S/A) had been enabled on Block II satellites during part of 1990; S/A off between about 10 August 1990 and 1 July 1991 due to Gulf crisis; standard level re-implemented on 15 November 1991; occasionally off for test and other purposes. Currently, PRN15 and PRN28 appear to have little or no S/A imposed. 5. Anti-spoofing (A-S) was activated on 94-01-31 at 00:00 UT on all Block II satellites (ref. NANU 050-94042); occasionally off for test and other purposes. A-S was turned off on all satellites at 20:00 UT on 95-04-19 and back on on 95-05-10; off again between 95-06-19 and 95-07-10; and between 95-10-10 and 95-10-31. A-S has been off on PRN28 since 95-02-21. 6. PRN number of SVN32 was changed from 32 to 01 on 93-01-28. 7. The active clock on PRN01 was switched from a Rb to a Cs between 96-08-16 and 96-08-22 (ref. USNO and NANUs 134-96229 and 141-96234). 8. PRN05 and PRN06 are equipped with corner-cube reflectors for satellite laser ranging (SLR). SLR tracking of the satellites will permit onboard clock errors and satellite ephemeris errors in GPS tracking to be differentiated. 9. The decommissioning date for PRN06/SVN03 is the date of termination of operations of this satellite (ref. USNO) and is about 3 weeks later than other published dates for "deactivation." 10. PRN16 will be moved from the E-3 slot to the E-5 slot to make room for PRN10. An orbit maneouvre was carried out on 96-08-19 (ref. NANUs 120-96204, 137-96232). 11. PRN20 has been unusable since 15:18 UT on 96-05-10 and will not return to service (ref. NANU 118-96204). Cause of failure: loss of 3-axis stabilisation. PRN20 was moved out of the B-2 slot to make room for PRN30 (ref. NANU 162-96256). 12. PRN28 has been moved from the C-2 slot to the C-5 slot, about 40 degrees away. This move, which was initiated on 96-03-06 by lowering the orbit of PRN28 by about 6 km, made way for PRN03. PRN03 is a backup for PRN28 which has some undisclosed equipment problem. PRN28 will remain on the air, with some subsystems shut down to conserve power (ref. NANUs 045-96066, NANU 068-96100, and GPS World Newsletter). The move was completed on 96-08-23 (ref. NANUs 127-96236 and 144-96236). 13. PRN30 (SVN30) was launched on 96-09-12 at 08:49 UT. It achieved initial usable status on 96-10-01 at 15:28 UT (ref. NANUs 162-96256 and 171-96275). 14. Announced date of next scheduled launch: 97-01-13 (first Block IIR satellite). 15. Compiled by Richard B. Langley, Dept. of Geodesy and Geomatics Engineering, University of New Brunswick. =============================================================================== Richard B. Langley Internet: LANG@UNB.CA or SE@UNB.CA Geodetic Research Laboratory BITnet: LANG@UNB or SE@UNB Dept. of Geodesy and Geomatics Engineering Phone: (506) 453-5142 University of New Brunswick FAX: (506) 453-4943 Fredericton, N.B., Canada E3B 5A3 Telex: 014-46202 Fredericton? Where's that? See: http://degaulle.hil.unb.ca/NB/fredericton.html =============================================================================== 3. Russian Global Navigational (Positioning) Spacecraft, GLONASS constellation. (SPACEWARN requests updates/additions from readers to this list. An asterisk [*] indicates updates or additions to the list.) All GLONASS spacecraft are in the general COSMOS series. The COSMOS numbers invoked by USSPACECOM have sometimes differed from the numbers (NNNN) associated in Russia. The corresponding GLONASS numbers are Russian numbers. The operating frequencies in MHz are computed from the channel number K. Frequencies (MHz) are L1 = 1602.0 + 0.5625K and L2 = 1246.0 + 0.4375K. The standard format of the GLONASS situation appeared in SPX-515. The following E-mail from CSIC may be more useful to the user community. From: AMES::"sfcsic@mx.iki.rssi.ru" "CSIC of the Russian Space Forces" 26-DEC-1996 17:39:22.70 To: Arne Jungstand , Geoff Evens , Georg Weber , Ivan Levenets , Mahooti Shahrzad , "Mr. Parthasarathy" Subj: Latest GLONASS constellation status 1.STATUS Information Group GLONASS Constellation Status (December 26, 1996) GLONASS Cosmos Plane/ Frequ. Launch Intro Status Outage number number slot chann. date date date 769 2178 1/8 2 30.01.92 22.02.92 operating 771 2179 1/1 23 30.01.92 18.02.92 withdrawn 21.12.96 756 2204 3/21 24 30.07.92 19.08.92 operating 759 2235 1/7 21 17.02.93 25.08.93 operating 757 2236 1/2 5 17.02.93 14.03.93 operating 758 2275 3/18 10 11.04.94 04.09.94 operating 760 2276 3/17 24 11.04.94 18.05.94 operating 761 2277 3/23 3 11.04.94 16.05.94 operating 767 2287 2/12 22 11.08.94 07.09.94 operating 770 2288 2/14 9 11.08.94 04.09.94 operating 775 2289 2/16 22 11.08.94 07.09.94 operating 762 2294 1/4 12 20.11.94 11.12.94 operating 763 2295 1/3 21 20.11.94 15.12.94 unusable 23.12.96 764 2296 1/6 13 20.11.94 16.12.94 operating 765 2307 3/20 1 07.03.95 30.03.95 operating 766 2308 3/22 10 07.03.95 05.04.95 operating 777 2309 3/19 3 07.03.95 06.04.95 operating 780 2316 2/15 4 24.07.95 26.08.95 operating 781 2317 2/10 9 24.07.95 22.08.95 operating 785 2318 2/11 4 24.07.95 22.08.95 operating 776 2323 2/9 6 14.12.95 07.01.96 operating 778 2324 2/9 11 14.12.95 spare 782 2325 2/13 6 14.12.95 18.01.96 operating Note: All the dates (DD.MM.YY) are given at Moscow Time (UTC+0300) 2.SUMMARY Information Group SUBJ: GLONASS STATUS 26 DECEMBER 96 1.SATELLITES, PLANES, SLOTS AND CHANNELS Plane 1/ slot: 01 02 03 04 05 06 07 08 Channel: -- 05 -- 12 -- 13 21 02 Plane 2/ slot: 09 10 11 12 13 14 15 16 Channel 06 09 04 22 06 09 04 22 Plane 3/ slot: 17 18 19 20 21 22 23 24 Channel: 24 10 03 01 24 10 03 -- 2.CURRENT ADVISORIES (ADV) AND FORECASTS (FCST) INFORMATION IS REPEATED FOR ONE MONTH AFTER EVENT CONCLUDES. ALL THE DATES (DD.MM.YY) ARE GIVEN AT MOSCOW TIME (UTC+0300) A. FORECASTS NAGU-MSG.DATE-TIME-SL/CH-TYPE-SUMMARY B. ADVISORIES NAGU-MSG.DATE-TIME-SL/CH-TYPE-SUMMARY 233-961206-06.12.96-1200-23/03-ADVS-UNUSABLE 05.12/1109-05.12/1134 234-961206-06.12.96-1200-18/10-ADVS-UNUSABLE 05.12/1330-05.12/1456 235-961209-09.12.96-1100-03/21-ADVS-UNUSABLE 07.12/0123-07.12/0153 236-961211-11.12.96-1100-15/04-ADVS-UNUSABLE 11.12/0318-UNFINISHED 237-961214-14.12.96-1100-15/04-ADVS-PUT INTO OPERATION 11.12/1317 238-961215-15.12.96-1100-03/21-ADVS-UNUSABLE 15.12/0355-15.12/0432 239-961216-16.12.96-1000-07/21-ADVS-UNUSABLE 15.12/1920-15.12/2032 241-961223-23.12.96-1100-03/21-ADVS-UNUSABLE 23.12/0240-UNFINISHED 242-961226-26.12.96-1100-18/10-ADVS-UNUSABLE 25.12/0946-25.12/1003 C. GENERAL: NO IMPACT, INFORMATIONAL PURPOSE ONLY NAGU-MSG.DATE-TIME-SL/CH-TYPE-SUMMARY 240-961223-23.12.96-1100-01/23-GNRL-END OF OPERATION 21.12.96 3.NAGU Information Group 233-961206 NOTICE ADVISORY TO GLONASS USERS (NAGU) 233-961206 SUBJ: 23/03(761) UNUSABLE 05.12/1109-05.12/1134 MT 1.CONDITION: 23/03(761) WAS UNUSABLE SINCE 05.12/1109 UNTIL 05.12/1134 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 234-961206 NOTICE ADVISORY TO GLONASS USERS (NAGU) 234-961206 SUBJ: 18/10(758) UNUSABLE 05.12/1330-05.12/1456 MT 1.CONDITION: 18/10(758) WAS UNUSABLE SINCE 05.12/1330 UNTIL 05.12/1456 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 235-961209 NOTICE ADVISORY TO GLONASS USERS (NAGU) 235-961209 SUBJ: 03/21(763) UNUSABLE 07.12/0123-07.12/0153 MT 1.CONDITION: 03/21(763) WAS UNUSABLE SINCE 07.12/0123 UNTIL 07.12/0153 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 236-961211 NOTICE ADVISORY TO GLONASS USERS (NAGU) 236-961211 SUBJ: 15/04(780) UNUSABLE 11.12/0318 MT-UNFINISHED 1.CONDITION: 15/04(780) WAS UNUSABLE SINCE 11.12/0318 MT (UTC+0300) UNTIL FURTHER NOTICE DUE TO MAINTENANCE 2.USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY 3.POC:CSIC RSF AT +7-095-333-81-33 237-961214 NOTICE ADVISORY TO GLONASS USERS (NAGU) 237-961214 REF: NAGU 236-961211 SUBJ: 15/04(780) PUT INTO OPERATION IN 11.12/1317 (UTC+0300) MT 1.CONDITION: 15/04(780) WAS PUT INTO OPERATION ON 11.12/1317 MT (UTC+0300) 2.USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY 3.POC:CSIC RSF AT +7-095-330-91-74 238-961215 NOTICE ADVISORY TO GLONASS USERS (NAGU) 238-961215 SUBJ: 03/21(763) UNUSABLE 15.12/0355-15.12/0432 MT 1.CONDITION: 03/21(763) WAS UNUSABLE SINCE 15.12/0355 UNTIL 15.12/0432 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 239-961216 NOTICE ADVISORY TO GLONASS USERS (NAGU) 239-961216 SUBJ: 07/21(759) UNUSABLE 15.12/1920-15.12/2032 MT 1.CONDITION: 07/21(759) WAS UNUSABLE SINCE 15.12/1920 UNTIL 15.12/2032 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 240-961223 NOTICE ADVISORY TO GLONASS USERS (NAGU) 240-961223 REF: 218-961031 SUBJ: 01/23(771) END OF OPERATION 21.12 1.CONDITION: 01/23(771) WAS WITHDRAWN SINCE 21.12 ALL OPERATIONS ENDED 2.POC:CSIC RSF AT +7-095-333-81-33 241-961223 NOTICE ADVISORY TO GLONASS USERS (NAGU) 241-961223 SUBJ: 03/21(763) UNUSABLE 23.12/0240 MT-UNFINISHED 1.CONDITION: 03/21(763) WAS UNUSABLE SINCE 23.12/0240 MT (UTC+0300) UNTIL FURTHER NOTICE DUE TO MAINTENANCE 2.USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY 3.POC:CSIC RSF AT +7-095-333-81-33 242-961226 NOTICE ADVISORY TO GLONASS USERS (NAGU) 242-961226 SUBJ: 18/10(758) UNUSABLE 25.12/0946-25.12/1003 MT 1.CONDITION: 18/10(758) WAS UNUSABLE SINCE 25.12/0946 UNTIL 25.12/1003 MT (UTC+0300) 2.POC:CSIC RSF AT +7-095-333-81-33 % Date: Thu, 26 Dec 1996 13:34:16 +0300 % From: CSIC of the Russian Space Forces % Organization: CSIC Russian Space Forces Mail: PO BOX 14, Coordinational Scientific Moscow, 117279 ,Russia Information Center (CSIC) Russian Space Forces Tel: +7 095 333-81-33 RUSSIA, Moscow, Profsoyuznaya ulitsa, 84/32. +7 095 330-91-74 Fax: +7 095 334-23-00 E-mail: sfcsic@mx.iki.rssi.ru Home page WWW.IKI: http://www.rssi.ru/SFCSIC/SFCSIC_main.html ------------------------------------------------------------------------- 4. Actual decays/landings of payload spacecraft and rocket bodies (R/B) only. No further information is available. Designations Common Name 1996 1996-069B (24671) R/B COSMOS 2335 12 Dec 1996-065A (24660) STS 80 Landed on 07 Dec 1996-065B (24661) ORFEUS-SPAS Recaptured by STS 60 07 Dec 1996-065C (24662) WSF 3 Recaptured by STS 60 07 Dec 1988-051B (19216) OSCAR 13 06 Dec 1996-059A (24634) FSW 2-3 03 Dec 1996-060C (24642) R/B MOLNIYA 3-48 26 Nov 1996-066B (24664) R/B PROGRESS M-33 22 Nov 1996-064A (24656) MARS 96 18 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.) Efforts to activate MAGION-5 spacecraft (a sub-satellite of Interball-AURORA) that was launched on 29 August 1996 continue. It has remained inoperational since launch due to an electrical short in the solar panels. 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 (REQUEST@NSSDCA.GSFC.NASA.GOV). Information on the current status of the instruments on board from the investigators will be most welcomed. Precomputed trajectory files and orbital parameters of many magnetospheric and heliospheric science-payload spacecraft may be FTP'ed from NSSDC's ANON_DIR:[000000.ACTIVE] and its several subdirectories. (See the last page of the bulletin for the access method; a file in the ACTIVE directory named AAREADME.DOC outlines the contents.) It can also be accessed through the WWW URL http://sscop1.gsfc.nasa.gov/ssc.html This HTML also enables executing several codes related to the orbits of many geocentric science payload spacecraft. The codes related to the heliospheric spacecraft trajectories can be executed through the URL http://nssdc/space/helios/heli.html Magnetospheric, planetary, and astronomical science data from many spacecraft may be accessed through links from the URL http://nssdc.gsfc.nasa.gov/ =========================================================================== SPACEWARN Bulletin ------------------ The Bulletin is intended to serve as an international communication medium for the rapid distribution of information on satellites and space probes. The material it contains is based on guidelines in the COSPAR Guide to Rocket and Satellite Information and Data Exchange, COSPAR Transactions #8, December 1972, and various Committee on Space Research (COSPAR) resolutions. Hard copy recipients and electronic accessers are encouraged to disseminate the 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:[000000.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 Other subdirectories in [000000.active] carry many files of interest on science payload spacecraft. The bulletin may also be accessed through the World Wide Web (WWW). The URL is http://nssdc.gsfc.nasa.gov/spacewarn/spacewarn.html. 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 633, 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 follows: CATEGORY 1: Spacecraft that carry essentially continuous telemetry or radio beacons, usually on frequencies less than 150 MHz. CATEGORY 2: GPS constellation of positioning/navigational spacecraft. CATEGORY 3: GLONASS constellation of positioning/navigational spacecraft. CATEGORY 4: Occassionally, a list of bright, orbiting objects of visual magnitude 4 or brighter. The bulletin also carries launch dates, international ID's and USSPACECOM catalog numbers, followed by a brief outline of the payload and orbital parameters, re-entry of major objects, and miscellaneous sections. These data are based on launch announcements or on information received from individuals, launching authorities, FBIS and USSPACECOM telexes, and news magazines.