Saturday, July 24, 1999
Friday, July 23, 1999
GOES-6
1983-041A
Geostationary Operational Environmental Satellite 06 (GOES F) was launched by Delta 3914 from Cape Canaveral LC17A at 2226 on 1983 Apr 28. By May 13 it was on station at the GOES W position. After the failure of GOES 5's imager in Jul 1984, GOES 6 was moved to a compromise position at 98W, from where it could cover both coasts of the United States. It arrived there on 1984 Aug 21. In Nov 1986 it was moved to 109.3W in anticipation of the GOES 7 launch, arriving on station on Dec 28.
| GOES 6 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1983 Apr 28 | 2226 | Launch by Delta 3914 | |
| T+0:57 SRM 1-5 off | |||
| SRM 6-9 on | |||
| T+1:04 SRM 1-5 sep | |||
| SRM 6-9 off | |||
| T+2:01 SRM 6-9 sep | |||
| T+3:44 MECO | |||
| T+3:52 Stage 1 sep | |||
| 2230 | T+3:58 SES-1 4:20 | ||
| T+4:? Fairing | |||
| 2234 | T+8:18 SECO-1 | 190? x 400? x 28? | |
| 2246 | T+20:14 SES-2 51s | ||
| 2247 | T+21:05 SECO-2 | 260? x ? x 26? | |
| 2248 | T+22:07 Spinup | ||
| 2248 | T+22:09 St 2 sep | ||
| 2248 | T+22:40 TES 44s | ||
| 2249 | T+23:33 TECO | ||
| 2250 | T+24:42 St 3 sep | 883.42 258 x 47981 x 25.3 | |
| SES-3 depletion | 118.39 404 x 2827 x 25.3 | ||
| 1983 Apr 30 | 1130? | Star 27 burn 35s, 1st apo | |
| 1130? | Star 27 burnout | ||
| 1145? | Star 27 eject | ||
| 1983 Apr 30 | 1707.33 33377 x 48482 x 0.4 | ||
| 1983 May 3 | 1708.31 33531 x 48386 x 0.5 | ||
| 1983 May 6 | 1568.49 33528 x 43151 x 0.5 | ||
| 1983 May 9 | 1566.48 35463 x 41140 x 0.5 | ||
| 1983 May 9 | 1480.99 35435 x 37885 x 0.5 | ||
| 1983 May 10 | 1429.67 35435 x 35885 x 0.5 GEO 138.2W+1.6E | ||
| 1983 May 14 | 1436.00 35716 x 35852 x 0.4 GEO 134.8W | ||
| 1984 Jan 30 | 1436.12 35781 x 35792 x 0.1 GEO 136.1W | ||
| 1984 Aug 10 | mv out | 1436.35 35781 x 35802 x 0.1 GEO 135.2W | |
| 1984 Aug 12 | 1431.05 35580 x 35794 x 0.1 | ||
| 1984 Sep 11 | mv in 97W | 1436.06 35775 x 35796 x 0.0 GEO 97.8W | |
| 1984 Oct 13 | 1436.11 35779 x 35794 x 0.0 GEO 97.0W | ||
| 1984 Oct 24 | mv out | ||
| 1984 Dec 12 | mv in 108W | 1436.28 35731 x 35848 x 0.2 GEO 108.1W | |
| 1985 Jan 18 | 1436.11 35710 x 35863 x 0.0 GEO 108.5W | ||
| 1985 May 26 | mv out | 1436.08 35745 x 35827 x 0.05 GEO 107.8W | |
| 1985 Jul 11 | mv in 97W | 1436.00 35780 x 35789 x 0.1 GEO 98.9W | |
| 1985 Aug 28 | 1435.96 35780 x 35787 x 0.1 GEO 97.4W | ||
| 1985 Oct 22 | mv out | 1436.11 35784 x 35789 x 0.1 GEO 97.7W | |
| 1985 Oct 24 | 1437.58 35783 x 35847 x 0.1 | ||
| 1986 Jan 16 | mv in 108W | 1436.11 35779 x 35794 x 0.0 GEO 108.2W | |
| 1986 Jun 12 | 1436.20 35787 x 35790 x 0.1 GEO 108.3W | ||
| 1986 Jun 20 | mv out | 1434.34 35712 x 35791 x 0.1 GEO 107.6W+0.4E | |
| 1986 Jul 8 | mv in 97W | 1436.06 35781 x 35790 x 0.0 GEO 98.6W | |
| 1986 Aug 22 | 1436.00 35774 x 35794 x 0.1 GEO 98.0W | ||
| 1996 Nov 18 | 1436.14 35779 x 35796 x 0.1 GEO 97.7W | ||
| 1996 Nov 20 | mv out | 1437.92 35781 x 35863 x 0.1 GEO 97.7W+0.4W | |
| 1986 Dec 15 | mv in 108W | 1436.15 35781 x 35793 x 0.0 GEO 107.4W | |
| 1987 Mar 12 | 1436.17 35783 x 35792 x 0.1 GEO 108.2W | ||
| 1987 Apr 5 | mv out | 1439.84 35846 x 35873 x 0.1 GEO 112.9W+1.0W | |
| 1987 Jun 11 | mv in 135W | 1436.10 35763 x 35810 x 0.1 GEO 136.3+0.01W | |
| 1987 Jun 22 | 1436.04 35765 x 35805 x 0.0 GEO 136.2W | ||
| 1988 Feb 20 | 1436.10 35767 x 35805 x 0.1 GEO 135.7W | ||
| 1989 Jan 21 | VAS failed | ||
| 1989 Jul 31 | 1436.08 35748 x 35823 x 1.5 GEO 134.1W | ||
| 1990 May 20 | 1435.97 35773 x 35795 x 2.1 GEO 136.1W | ||
| 1992 Mar 3 | 1436.21 35775 x 35802 x 3.8 GEO 136.1W | ||
| 1992 May 19 | mv out | 1435.91 35771 x 35794 x 3.9 GEO 134.7W+0.04E | |
| 1992 May 24 | Decommissioned | ||
| 1992 Nov 8 | drifting | 1435.34 35761 x 35781 x 4.3 GEO 114.5W+0.2E | |
| 1994 Mar 19 | 1436.85 35785 x 35817 x 5.4 GEO 96.5W+0.2W | ||
Kosmos 961
1977-104A
Kosmos-961 carried out a record low altitude intercept of Kosmos 959. The deorbit of Kosmos-961 was observed from Japan.
| Kosmos-961 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1977 Oct 26 | 0514 | Launch by 11K69 | KB |
| 0516 | Stage 2 burn | ||
| 0519 | Stage 2 MECO | 88.7 125x302x66 (NLJ) | |
| 0542? | Possible orbit change | 101.8 269x1421x66.4 (RAE) | |
| 0555? | Orbit change | ||
| 0640? | Guess perigee burn | ||
| 0725? | Orbit change | ||
| 0820? | Flyby K959 | ||
| 0837? | Reentered over NE Japan coast | ||
Kosmos 759
1975-084A
Kosmos-759 made an unusual midnight recovery after its 11 day mission. This was a test flight of a new visual beacon to aid in future Zenit recoveries.
| Kosmos-759 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1975 Sep 12 | 0530 | Launch by Soyuz | Plesetsk |
| 0534 | Blok-I burn | ||
| 0538 | Blok-I sep | ||
| 1975 Sep 12 | 89.55 229 x 275 x 62.8 | ||
| 1975 Sep 18 | 89.47 227 x 269 x 62.8 | ||
| 1975 Sep 23 | |||
| 2006? | Deorbit | ||
| 2015? | PO sep | ||
| 2026? | Entry | ||
| 2042? | Landed | ||
Thursday, July 22, 1999
Galaxy 10
1998-F03
Galaxy 10 was a Hughes HS-601HP satellite built by Hughes/El Segundo for Panamsat. The satellite carried 24 C-band and 24 Ku-band transponders to provide US/Caribbean coverage, and was to have replaced the aging SBS-5 satellite at 123 deg West. Launch mass of Galaxy 10 was 3876 kg; BOL mass 2115 kg. I haven't been able to find its dry mass. Replenishing the Galaxy/PAS constellation was a high priority for Panamsat following the loss of Galaxy 4 and problems with Galaxy 7.
Dimensions are 26m span, 5.9m x 2.7m x 3.6m stowed.
Galaxy III was on the first Delta III 8930 launch vehicle, lost 80 seconds into flight on 1998 Aug 26. Boeing Expendable Launch Systems (formerly McDonnell Douglas) builds the Delta III at Huntingdon Beach, California with final assembly in Pueblo, Colorado. The standard Delta II model is widely regarded as one of the world's most reliable launch vehicles, and I expect that the Delta team will recover from this failure and eventually bring the new rocket up to the same standard. However, the loss of the initial vehicle is certainly a major blow for Boeing and for the US space launch industry; although it represents less money than the recent Titan failure, it will probably have a wider impact. The Delta III consists of:
- Nine Alliant GEM-46 solid strapon motors, a scaled up version of the GEM-40 motors used on the Delta II 7925. The graphite-epoxy case motors use HTPB solid propellant. The motors are built in Alliant's Bacchus, Utah factory; Alliant was formerly known as Hercules Powder and built the upper stage for the first Delta back in 1960.
- The Delta III First Stage, similar to the Delta II first stage, but with the fuel tank at the top reshaped to fit with the wider upper stage. It uses the same LOX/kerosene RS-27A main engine as the Delta II.
- The Delta III Second Stage. This is an entirely new stage, and the first entirely new high energy upper stage developed in the US since the 1960s. It uses a Pratt and Whitney LOX/liquid hydrogen RL10B-2 engine with a long extensible nozzle built by SEP of France. The RL10B-2, with a world record specific impulse of over 462 seconds, is a new version of the venerable RL10 engine used in the Lockheed Martin Astronautics Centaur, the other US high energy upper stage. The liquid hydrogen tank for the Delta III second stage is build by Mitsubishi of Japan, which also builds the liquid hydrogen stage of the Japanese H-II rocket. The Delta III second stage is 4.0m in diameter, much larger than the Delta II stage which still uses tankage derived in part from the 1960-vintage Ablestar. However, the appearance of the new stage, with the narrower LOX tank held inside an interstage and the large nozzle assembly, is still reminiscent of the traditional Delta stage.
- The 4.0 meter fairing, much larger than the old 10-foot Delta II fairing. Boeing also builds the large Titan IV fairings, so has lots of experience in this field.
The launch profile involves igniting the RS-27A main engine and six of the GEM-46 solids at launch. At 80 seconds into flight the six solids separate and the remaining three GEM-46 solids ignite. At 40-50 seconds, however, an unexpected 4 Hz roll mode instability became significant and the solid motor TVC fuel ran out correcting the problem, causing the vehicle to go out of control.
The planned launch profile included a first burn of the second stage engine from T+4min to T+13 min, leaving Delta in a 157 x 1176 km parking orbit. After a 9 minute coase, the stage would burn again to enter a 185 x 35719 km x 27.5 deg geostationary transfer orbit, separating from the Galaxy 10 satellite payload.
| Galaxy 10 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1998 Aug 27 | 0117:00 | Launch by Delta 3 | CC LC17B |
| 0117:55 | T+0:55 Guidance problem | ||
| 0118:12 | T+1:12 Yaw 30 degrees, 18 km alt | ||
| 0118:15 | T+1:15 auto destruct | ||
Kosmos 559
1973-030A
Kosmos-559 was launched in May 1973 from Plesetsk, aboard the first Soyuz-U (11A511U) launch vehicle which would become the standard model for a quarter century. This Zenit-4MK satellite remained in orbit for 5 days and possibly represents a test mission.
| Kosmos-559 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1973 May 18 | 1100:02 | Launch by 11A511U | PL |
| 1104 | Blok-I burn | ||
| 1108 | Blok-I sep | ||
| 1430 | 89.79 204 x 325 x 65.41 | ||
| 1973 May 22 | Engine sep | 89.78 211 x 317 x 65.39 | |
| 1973 May 23 | 0554?? | Retrofire | |
| 0604? | PO sep | ||
| 0610? | Entry | ||
| 0624? | Landed | ||
Wednesday, July 21, 1999
Mariner 4
1964-077A
Mariner C-3 (Mariner IV after launch) left pad 13 at Cape Kennedy at 1422:01 on 1964 Nov 28. Spacecraft mass was 261 kg including 10 kg of propellant. It entered Earth orbit at 1430 and the Agena D reignited to insert Mariner IV into solar orbit at 1504:28. The Agena separated at 1507:09. Mariner IV made one course correction, at 1609:11 on 1964 Dec 5, before its Mars flyby. Periapsis was at 0100:57 on 1965 Jul 15, and the encounter phase lasted from Jul 14 to Aug 3. Flyby distance was 9844 km. Mariner IV returned photos of the Martian surface revealing a cratered landscape not unlike the Moon. The mission was declared over on 1965 Oct 1, with Mariner IV in a 165.8 x 235.3 million km solar orbit. In an engineering test, a second course correction was carried out at 0603 on 1967 Oct 26, into a 165.6 x 233.5 million km orbit. Mariner IV exhausted its attitude control gas on 1967 Dec 7, and after a rush of 85 micrometeor hits on Dec 10-11 could no longer maintain reliable communications with Earth. The probe was decommissioned on 1967 Dec 20.
| Mariner 4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1964 Nov 28 | 1422:01 | Launch by Atlas Agena D | |
| 1424? | BECO | ||
| Atlas MECO | |||
| Fairing sep | |||
| 1427? | Atlas sep | ||
| Agena MES1 | |||
| 1430:38 | Agena MECO, 32min coast | 88.1 172 x 185 x 28.3 | |
| 1502:53 | Agena MES2, 1:36 | ||
| 1504:28 | Agena MECO2 | ||
| 1507:09 | Agena sep | 187 x -96015 x 28.13 | |
| Agena retro | |||
| 1507:57 | Solar orbit insertion, miss dist 242960 km | ||
| 1964 Dec 5 | 1609:11 | TCM | |
| 1965 Jul 14 | Encounter phase | ||
| 1965 Jul 15 | 0100:57 | Mars flyby 9844 km C/A=13201 km | |
| 1965 Jul 15 | 0219:11 | Mars occultation | |
| 0313:04 | Out of occultation | ||
| 1965 Aug 3 | End of encounter | ||
| 1965 Oct 1 | End of mission | 165.8x 235.3 Mkm | |
| 1966 Mar 27 | Superior conjunction, transmitter tests | ||
| 1967 Jul 1 | 1.5M km from Earth | ||
| 1967 Oct 26 | 0603:05 | TCM-2 70s 62.1m/s | 165.6 x 233.5 Mkm |
| 1967 Oct | Cold gas leak | ||
| 1967 Dec 7 | End of ops | ||
Payload:
- Magnetometer
- CR telescope
- Micrometeors
- Ion chamber
- Mars trapped radiation detectors, GM tubes
- Solar plasma probe
- TV camera
Tuesday, July 20, 1999
Kosmos 1945
1988-042A
Two-tone telemetry; Hi res satellite
| Kosmos-1945 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1988 May 19 | 0915:00 | Launch by Soyuz | KB |
| 0919 | Blok-I burn | ||
| 0923 | Blok-I sep | ||
| 1988 May 20 | 90.05 233x322x70.4 | ||
| 1988 May 27 | 89.21 214 x 255 x 70.4 | ||
| 1988 May 30 | 89.16 215 x 251 x 70.4 | ||
| 1988 May 31 | |||
| 0646? | Deorbit | ||
| 0655? | PO sep | ||
| 0702? | Entry | -212 x 248 | |
| 0718? | Landed | ||
Sunday, July 18, 1999
Mariner 10
1973-085A
The Mariner Venus Mercury 73 probe was built by Boeing for JPL. The probe was Mariner 73J or Mariner J, Mariner 10 after launch.
The launch took place at 0545 on 1973 Nov 3 by Atlas Centaur from Cape Kennedy. The Atlas separated at 0549 and the Centaur ignited for its first burn, entering parking orbit at 0555. It reignited at 0620 for a 132s burn, separating at 0625 and leaving Mariner 10 in solar orbit en route to Venus. The solar panels and antennae were deployed at this point. In the first few days, Mariner 10 tested its imaging system on the Moon. TCM-1 was a 20s burn made at 0042 on Nov 14, reducing Venus miss distance from 55000 km to 5000 km; the second course correction, TCM-2, was a 3s burn at 1914 on 1974 Jan 21. The probe made observations of comet Kohoutek in January.
The Venus near encounter phase was considered to begin at 1621 on 1974 Feb 5. Periapsis of 5793 km was at 1801 on Feb 5. The far encounter phase began at 1315 on Feb 6 and lasted until Feb 13. Trajectory Correction Maneuver 3 was a 51s burn on Mar 16, to refine the Mercury encounter. Mercury far encounter began on Mar 23, and the near encounter at 0435 on Mar 29. Perihermion was 740 km at 2046 on 1974 Mar 29. Near encounter concluded at 2336 on Mar 30, and far encounter on Apr 12. Mariner 10 had returned the first closeup images of the planet Mercury.
Mariner 10 now made course corrections to ensure the resulting orbit would repeatedly encounter Mercury. TCM-4A and 4B were 195s and 139s burns on May 9; TCM-5 was a 19s burn at 2009 on Jul 2. The Mercury 2 Encounter took place Sep 20-23 with a 48000 km closest approach at 2050 on 1974 Sep 21. TCM-6 was an 83s burn at 2152 on Oct 30, TCM-7 was a 12s burn at 2156 on 1975 Feb 13, and TCM-8 was a final 3s burn at 1855 on 1975 Mar 6 to ensure that Mariner did not hit Mercury. The Mar 16-17 Mercury 3 Encounter saw a 320 km flyby at 2239:24 on 1975 Mar 16. Mariner 10 sent its last transmission on 1975 Mar 24. About half the planet had been mapped by the three flybys.
| Mariner 10 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1973 Nov 3 | 0545:00 | Launch by Atlas Centaur | |
| T+2:26 BECO | |||
| T+2:29 Booster jettison | |||
| T+3:11 Insulation panels sep | |||
| T+4:10 SECO/VECO | |||
| 0549:12 | T+4:12 Atlas sep | ||
| 0549:22 | T+4:22 Centaur MES-1 | ||
| 0551:34 | T+6:34 Fairing | ||
| 0554:30 | T+9:30 Centaur MECO1 | 88.20 183 x 187 x 28.86 | |
| 0619:30 | T+34:30 Centaur MES2, 132s | ||
| 0621:40 | T+36:40 Centaur MECO2 | ||
| 0624:01 | T+38:15 Centaur sep 11.38 km/s | 189 x -56493 x 28.90 | |
| 0628 | Mag boom deploy | ||
| 0629 | Deploy solar panels | ||
| 0631? | T+46:00? Centaur retro | ||
| 0646 | PSE boom deploy | ||
| 1358? | Pass EL1:4 | ||
| 1973 Nov 3 | 2145 | Near Earth Cal phase imaging | |
| 1973 Nov 4 | 0400? | Flyby Moon at 112000 km | |
| 1973 Nov 5 | 1400 | Leave Earth SOI | 0.6 x 1.0 AU x 3 deg? |
| 1973 Nov 6 | 1.4Mkm | ||
| 1973 Nov 10? | Cruise phase | ||
| 1973 Nov 14 | 0041:50 | TCM-1, 19.9s 7.78m/s 1.8 kg | |
| 0545 | Earth distance 4.0Mkm | ||
| 1973 Nov 28 | 1700 | Venus distance 77.4Mkm | |
| Earth distance 8.8 Mkm | |||
| Helio vel 26.736 km/s | |||
| 1973 Dec 14 | 0000 | Earth dist 14.0Mkm | |
| Venus dist 54.3 Mkm | |||
| 1974 Jan 3 | Earth dist 21Mkm | ||
| Venus dist 29Mkm | |||
| Helio vel 30.629 km/s | |||
| 1974 Jan 10 | Earth 23.7 Mkm | ||
| Venus 20.9 Mkm | |||
| Vhel 31.764 km/s | |||
| 1974 Jan 17 | Observations of Kohoutek | ||
| 1974 Jan 21 | 1914:38 | TCM-2, 3.8s 1.37m/s 0.4 kg | |
| 1974 Jan 23 | Earth 31.7 Mkm | ||
| Venus 9.5 Mkm? | |||
| Vhel 34.191 km/s | |||
| 1974 Jan 28 | RCS prop used during roll cal anomaly | ||
| 1974 Feb 1 | Earth dist 41 Mkm | ||
| Venus dist 2.72Mkm | |||
| 1974 Feb 3 | 0800 | RE=41.391Mkm etc | |
| 1974 Feb 4 | 0.64Mkm to Venus | ||
| VHel pre enc is 37.015 km/s | |||
| 1974 Feb 5 | 1621 | Venus near encounter | |
| 1701:50 | Venus flyby, 5793 km periapsis 1.96RV | ||
| 1974 Feb 6 | 1315 | Venus far encounter | |
| VHel post enc is 32.276 km/s | |||
| 1715 | Venus range 0.72Mkm | ||
| 1974 Feb 7 | 1701 | Venus range 1.43Mkm | |
| 1974 Feb 13 | End of encounter | ||
| 1974 Feb 19 | RE 60.5? Mkm RM 66 Mkm | ||
| 1974 Mar 16 | 1154:42 | TCM-3 51.1s 17.8m/s 3.9 kg | |
| 1974 Mar 23 | Mercury 1 far encounter | ||
| 1974 Mar 24 | RM 4.3Mkm | ||
| 1974 Mar 28 | 2000? | 0.9Mkm from Mercury | |
| 1974 Mar 29 | 0030? | 0.2Mkm | |
| 1974 Mar 29 | In Mercury sphere at 112000 km | ||
| 1974 Mar 29 | 0435 | Mercury 1 near encounter | |
| 0730 | Range 500000 km | ||
| 1150 | Range 335000 km | ||
| 1435 | Range 230000 km | ||
| 1600 | 179100 km | ||
| 1974 Mar 29 | 2046:38 | Mercury 1, 703 km 1.29RH | |
1974 Mar 30 | 0500 | 310000 km outbound | |
| 1200 | 575000 km | ||
| 1430 | 1.1Mkm | ||
| 1974 Mar 30 | 2336 | Mercury 1, end near encounter | |
| 1974 Mar 31 | 1900 | 1.73 Mkm | |
| 1974 Apr 1 | 1900 | 2.60 Mkm to Mercury | |
| 1974 Apr 8 | LGA to extended mission config | ||
| 1974 Apr 12 | Mercury 1, end far encounter | ||
| 1974 May 9 | 2005:00 | TCM-4A, 195s, 50m/s | |
| 1974 May 10 | 2005:40 | TCM-4B, 139s, 27.6m/s | |
| 1974 Jun 7 | RE 260M, RSun 108Mkm, Vhel 32 km/s | ||
| 1974 Jul 2 | 2009 | TCM-5 19s, 3.32m/s | |
| 1974 Sep 20 | Mercury 2 encounter | ||
| 1974 Sep 21 | 1939 | Range 76000 km | |
| 1974 Sep 21 | 2059 | Mercury 2, 47000 km at 40S 20.27RH | |
| 1974 Sep 23 | End encounter | ||
| 1974 Oct 30 | 2152 | TCM-6 83s | |
| 1975 Feb 13 | 2156 | TCM-7 12s | |
| 1975 Mar 6 | 1855 | TCM-8, 3s avoidance | |
| 1975 Mar 16 | Mercury 3 encounter | ||
| 1975 Mar 16 | 2239:24 | Mercury 3, 327 km 70N 1.13RH | |
| 1975 Mar 17 | End encounter | ||
| 1975 Mar 24 | End of tx | ||
Payload:
- TV cameras, vidicon with 1.5m aperture, x2
- Electrostatic analyser
- Electron spectrometer
- EUV spectrometer
- Occultation spectrometer
- IR radiometer, 8-14 mu, 34-55mu with 0.025m refracting telescopes.
- X-band transmitter (Radio science)
- S-band transmitter
- Triaxial fluxgate magnetometer
Explorer 3
1958-003
Explorer III was launched on 1958 Mar 26 by Juno I from Cape Canaveral It achieved a 186 x 2800 km x 33 deg orbit, much more eccentric than the planned 351 x 2043 km x 34.1 deg one. Transmissions were interrupted on May 10 and at the time it was thought this was due to Eta Aquarid micrometeor impacts. Explorer III reentered on 1958 Jun 28.
| Explorer III | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1958 Mar 26 | 1738:03 | Launch by Juno I | |
| 1740 | Redstone cutoff T+2:35 | ||
| 1740 | Redstone sep T+2:40 | ||
| 1744 | Stage 2 burn T+6:36 | ||
| Stage 2 cutoff T+6:44 | -5000 x 352 | ||
| 1745 | Stage 3 burn T+6:44 | ||
| Stage 3 cutoff T+6:52 | -3510 x 351 | ||
| 1745 | Stage 4 burn T+6:52 | ||
| 1745 | Stage 4 cutoff T+7:00 | 195 x 2810 x 33.4 | |
| 1749 | T+11:54 Stage 1 impact range 1433 km | ||
| 1750 | T+12:36 Stage 2 impact range 2081 km | ||
| 1752 | T+14:15 Stage 3 impact range 3142 km | ||
| 1958 May 10 | Transmitters failed | ||
| 1958 May 15 | Low power transmitter back on | ||
| 1958 May 15? | Low power transmitter failed | ||
| 1958 Jun 28 | Reentry | ||
Payload:
- Cosmic ray package, Geiger counter
- Erosion gauge micrometeorite detector
May 13,2026
https://planet4589.org/space/jsr/back/news.855.txt
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