| Date: | 1999-01-15 14:41:00 | |
| Sender: | Mike Pearlman <[Mailed Mike Pearlman <mpearlman@cfa.harvard.edu>]> | |
| Subject: | [SLR-Mail] No. 218: GLONASS Constellation Status | |
| Author: | ||
| Content: | ******************************************************************************** SLR Electronic Mail 1999-01-15 14:41:00 UTC Message No. 218 ******************************************************************************** Author: Mike Pearlman Subject: GLONASS Constellation Status X-Mailer: Pegasus Mail for Win32 (v2.54) Secretary, ILRS Central Bureau Dear Colleagues: Prior to the IGEX98 campaign, some discrepancies were found in the way the different GLONASS satellite numbers were generated by different groups. At that time, our community was unable to find the ”official” source for the two digit GLONASS numbering convention (e.g. Glonass 79), and we agreed to follow the order of the COSPAR numbering sequence (e.g. satellites 1995 68A, 1995 68B, and 1995 68C would be Glonass 77, 78, and 79 respectively.) This convention was used to define the satellites for IGEX98. We have now found the ”official source” of the two digit numbering, Richard B. Langley, from the Dept. of Geodesy and Geomatics Engineering, University of New Brunswick. In collaboration with Peter Daly from the University of Leeds and with concurrence from the officials in Russia, these numbers are assigned. A chart with their Glonass Constellation Status is included below. We have placed an augmented version on the ILRS web site at: http://ilrs.gsfc.nasa.gov/glonass.html FROM THE CHART, PLEASE NOTE: THE SLR TWO DIGIT SEQUENCE NUMBERS FOR GLONASS 77 and 79 ARE REVERSED FROM THE OFFICIAL NUMBERS ISSUED BY RICHARD LANGLEY. THE TABLE BELOW CONTAINS THE OFFICIAL NUMBERS. WE WILL CONTINUE TO USE THE PRESENT SLR CONVENTION FOR THE DURATION OF THE IGEX98 CAMPAIGN. WE WILL CONSIDER MAKING THE CHANGE AFTER THE CAMPAIGN IS OVER AND WE HAVE ASSESSED THE FULL IMPACT. Regards, Mike GLONASS Constellation Status Provided by Richard Langley (99-01-09) GLONASS Kosmos Internat. NORAD Plane Channel Almanac Launch Status Numbers Numbers ID Catalog Number Date (Date Number (Slot) (UTC) withdrawn) ------------------------------------------------------------------------------- 49 249 2111 1990-110C 21008 8-Dec-90 15-Aug-96 50 750 2139 1991-025A 21216 4-Apr-91 14-Nov-94 51 753 2140 1991-025B 21217 4-Apr-91 4-Jun-93 52 754 2141 1991-025C 21218 4-Apr-91 16-Jun-92 53 768 2177 1992-005A 21853 29-Jan-92 29-Jun-92 54 769 2178 1992-005B 21854 29-Jan-92 25-Jun-97 55 771 2179 1992-005C 21855 29-Jan-92 21-Dec-96 56 774 2206 (2204) 1992-047A 22056 30-Jul-92 26-Aug-96 57 756 2204 (2205) 1992-047B 22057 30-Jul-92 4-Aug-97 58 772 2205 (2206) 1992-047C 22058 30-Jul-92 27-Aug-94 59 773 2234 1993-010A 22512 17-Feb-93 17-Aug-94 60 757 2236 (2235) 1993-010B 22513 17-Feb-93 23-Aug-97 61 759 2235 (2236) 1993-010C 22514 17-Feb-93 4-Aug-97 62 760 2276 (2275) 1994-021A 23043 3 24 17 11-Apr-94 OK 63 761 2277 (2276) 1994-021B 23044 11-Apr-94 29-Aug-97 64 758 2275 (2277) 1994-021C 23045 3 10 18 11-Apr-94 UNH 65 767 2287 1994-050A 23203 2 22 12 11-Aug-94 UNH 66 775 2289 (2288) 1994-050B 23204 2 22 16 11-Aug-94 OK 67 770 2288 (2289) 1994-050C 23205 2 9 14 11-Aug-94 UNH 68 763 2295 (2294) 1994-076A 23396 1 21 3 20-Nov-94 OK 69 764 2296 (2295) 1994-076B 23397 1 13 6 20-Nov-94 OK 70 762 2294 (2296) 1994-076C 23398 1 12 4 20-Nov-94 OK 71 765 2307 1995-009A 23511 3 1 20 7-Mar-95 OK 72 766 2308 1995-009B 23512 3 10 22 7-Mar-95 OK 73 777 2309 1995-009C 23513 7-Mar-95 26-Dec-97 74 780 2316 1995-037A 23620 2 4 15 24-Jul-95 UNH 75 781 2317 1995-037B 23621 2 9 10 24-Jul-95 OK 76 785 2318 1995-037C 23622 2 4 11 24-Jul-95 OK 77 776 2323 1995-068C 23736 2 6 9 14-Dec-95 OK 78 778 2324 1995-068B 23735 2 11 9 14-Dec-95 Res 79 782 2325 1995-068A 23734 2 6 13 14-Dec-95 OK 80 786 2362 1998-077A 25593 1 8 8 30-Dec-98 CHK 81 784 2363 1998-077B 25594 1 7 7 30-Dec-98 CHK 82 779 2364 1998-077C 25595 1 2 2 30-Dec-98 CHK Notes ----- 1. NORAD Catalog Number is also known as U.S. Space Command (USSPACECOM) object number and NASA catalog number. 2. The numbers listed first in the ”Kosmos Numbers” column are the designators assigned by the Russian Federation. Where these differ from the designators assigned by the United States, the latter are given in parentheses. 3. Channel number, k, indicates L1 and L2 carrier frequencies: L1 = 1602. + 0.5625 k (MHz) k L2 = 1246. + 0.4375 k (MHz) k 4. Status codes: Res = satellite not in service but held in reserve OK = satellite fully operational. UNH = satellite currently flagged unhealthy. CHK = satellite undergoing checkout and commissioning. The date listed is the date the satellite was removed from service (Moscow Time) as reported by the Coordinational Scientific Information Center, Moscow. 5. All GLONASS satellites employ cesium atomic clocks. 6. The first GLONASS satellite was launched on 12-Oct-82. GLONASS 1 through 61 are no longer in service. 7. GLONASS 40 and 41 were launched with the Etalon 1 laser ranging satellite. GLONASS 42 and 43 were launched with Etalon 2. 8. The GLONASS numbering scheme used in this table includes the 8 ”dummy” satellites orbited as ballast along with ”real” satellites on the first 7 GLONASS launches. The second number in the ”GLONASS Numbers” column is that assigned by the Russian Space Forces. 9. New GLONASS channel allocations were introduced in September 1993 aimed at reducing interference to radio astronomy. Note the use of the same channel on pairs of antipodal satellites. 10. The most recent triple GLONASS launch took place on 30-Dec-98 at 18:35:46.23 UTC. The pairings of GLONASS/Kosmos and NORAD catalog numbers for the satellites from this launch may or may not be correct and will have to verified once the satellites have been moved to their assigned orbital slots. 11. GLONASS 758 (in slot 18) was set unhealthy on 13-Dec-98 due to maintenance. It is scheduled to be returned to service on 28-January-99 (ref. NAGU 080-981204). GLONASS 767 (in slot 12) was set unhealthy in the almanac on 5-Nov-98 (ref. NAGU 076-981106). The GLONASS Control Centre lost communications with this satellite at 4:54 UTC on 5-Nov-98. GLONASS 770 (in slot 14) was set unhealthy on 20-Nov-97 (ref. NAGU 105-971121). GLONASS 780 (in slot 15) was set unhealthy on 3-Dec-98 (ref. NAGU 079-981203) 12. Number of GLONASS satellites currently in service: 14 (plus 1 spare and 3 undergoing checkout and commissioning). 13. Number of GLONASS satellites currently usable: 11. 14. Status of satellites obtained from Michael G. Lebedev, Coordinational Scientific Information Center, Russian Space Forces (sfcsic@iki3.iki.rssi.ru); from the Massachusetts Institute of Technology Lincoln Laboratory GLONASS Group; and Peter Daly, CAA Institute of Satellite Navigation, Dept. of Electronic and Electrical Engineering, University of Leeds (pd@elec-eng.leeds.ac.uk). Compiled by Richard B. Langley, Dept. of Geodesy and Geomatics Engineering, University of New Brunswick. =============================================================================== Richard B. Langley E-mail: lang@unb.ca Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where´s that? See: http://www.city.fredericton.nb.ca/ =============================================================================== Dr. Michael R. Pearlman Harvard-Smithsonian Center for Astrophysics 60 Garden St. Cambridge MA 02138 tel. (617) 495-7481 fax. (617) 495-7105 e-mail. mpearlman@cfa.harvard.edu [Mailed From: ”Mike Pearlman” ******************************************************************************** |