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Two More Satellite Breakups Detected Joseph P. Loftus Retires from NASA

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Two More Satellite Breakups Detected Joseph P. Loftus Retires from NASA A publication of The Orbital Debris Program Office NASA Johnson Space Center Houston, Texas 77058 July 2001 Volume 6, Issue 3. NEWS Two More Satellite Breakups Detected P. Anz-Meador events. Assessed cause of the Cosmos 1701 type orbit. This lessens the spatial density in The third fragmentation event of the year fragmentation was aerodynamic loading due to low Earth orbit because of the large eccentricity 2001 occurred on or about 29 April with the the low perigee of the vehicle, rather than the and low perigee of the vehicle’s orbit. fragmentation of the Russian Cosmos 1701 deliberate destruction of the vehicle by an on- The second breakup event of the quarter spacecraft. The NASA Johnson Space Center’s board explosive system. took place about 16 June and involved a Orbital Debris Program Office was notified by Cosmos 1701 was an Oko-class vehicle. Russian Proton K Block DM ullage motor, the US Space Command’s (USSPACECOM) These vehicles perform missile launch early International Designator 1991-025G, Satellite Space Defense Operations Center (SPADOC) warning duties in orbits very similar to the Number 21226. The SSN detected as many as of the assessed fragmentation on 1 May 2001. Russian Molniya communications payloads. 100 debris in orbits similar to that of the parent Ten (10) large debris were tracked by the The three-axis stabilized vehicle is cylindrical object, which was 300 km by 18,960 km with USSPACECOM Space Surveillance Network in shape with two solar array panels and an an inclination of 64.5 degrees. (SSN) as of that date; as of 30 May 2001, no erectable sun shade for the primary on-board This was the 24th event of this type debris objects had entered the Space Control sensor system. Dimensions of the cylinder are identified since 1984 (see Orbital Debris Center’s (SCC) catalogue. Cosmos 1701 approximately 2 m in diameter and 1.7 m in Quarterly News, January 2001, for the previous (Satellite Number 16235, International length; dry mass is on the order of 1250 kg. breakup). The breakups of the ~55 kg objects Designator 1985-105A) was in an orbit of 85 An analysis of the event, conducted the are assessed to be related to the presence of km by 25,570 km with an inclination of 62.9 day the Orbital Debris Program Office was residual propellants. The problem was degrees at the time of the event. While this notified of the fragmentation, indicates that the recognized in the early 1990’s, and no Block event represents the 17th known breakup of a long-term environmental consequences are DM ullage motor launched since 1996 is known Cosmos 862-class payload since the first event minimal, as the parent object was in a to have experienced a fragmentation, in part due in 1977, this event is dissimilar to all preceding catastrophic decay from the original Molniya- to design and operational changes. Joseph P. Loftus Retires from NASA After an exceptionally distinguished career fledgling Mercury program, where he was NASA human space flight program matured of 47 years service to the US Government, responsible for defining the crew accommoda- and evolved into the Space Shuttle and Space including 41 years on behalf of NASA, Joseph tions and the crew control and display systems Station eras, Joe helped lead the way with both P. Loftus, Jr., retired on 30 April. Recently best in the Mercury and, then later, Apollo his technical and managerial expertise, known as the godfather of the NASA orbital spacecraft. Under a special task force effort, he including his tenure as Assistant Director debris program, Joe’s contributions to the US led the design of the systems to extend the lunar (Plans) of the Lyndon B. Johnson Space Center. space program date back to the US Air Force’s landing mission stay time from 24 to 72 hours During 1977-1979 Joe was instrumental in original man-in-space program, including and the complementary extension of the total bringing the issue of orbital debris to the Dynasoar. As an Air Force officer, he was mission duration of the orbiting command and attention of senior NASA management. His transferred to Houston in 1961 to assist the service modules from 9 to 12 days. As the (Continued on page 2) Inside... GOES 2 and Landsat 4 Retired ................................................................................................ 4 Overview of GEO Debris Observations Using the CCD Debris Telescope ........................ 5 A Fragmentation Assessment of Legacy Delta Rocket Bodies ...............................................7 Observations of Space Debris in Geosynchronous Orbits with the Michigan Schmidt....... 8 1 The Orbital Debris Quarterly News NEWS Joseph P. Loftus Retires from NASA, Continued (Continued from page 1) station Mir. Joe served as a valuable ambassa- Joe was awarded the NASA Distinguished efforts were rewarded in October 1979 when dor of NASA to the national and international Service Medal, along with several other NASA Headquarters provided the first official aerospace communities, including the IAF, IAA, recognitions of his extensive contributions to funding for orbital debris research, later leading and the United Nations, and is particularly well- NASA. His accomplishments not only are to the establishment of the Orbital Debris known for his work with electrodynamic tethers, reflected in the great history of NASA but also Program Office. Joe remained an active the geosynchronous debris environment, and will be a part of its future through the succeed- participate in the program until his retirement, orbital debris mitigation policies. ing generations of scientists and engineers culminating in his support to the US role in Twice the recipient of the NASA whom he has so powerfully and positively monitoring the deorbiting of the Russian space Exceptional Service Medal, upon his retirement influenced. Hubble Space Telescope Solar Array Hypervelocity Impact Tests R. Burt and E. Christiansen validates the existing M/OD environment. layer. The photo cell layers (glass and metal) As part of NASA’s effort to characterize The HST Solar Array Cells consist of three exhibit the characteristics of an impact crater and evaluate the Meteoroid and Orbital Debris main layers: the Photo Cell composed of a with the outer glass layer showing surface (M/OD) environment in low Earth orbit (LEO), CMX glass front face covering the silicon solar cracking and 2x to 3x larger craters (measured the Johnson Space Center Hypervelocity Impact cell; the RTV Adhesive Layer; and the Support at the surface) than the through hole in the RTV Technology Facility (HITF) conducted hyper- Layer, a composite structure on glass fiber, layer. The support layer (epoxy resin and mesh velocity impact (HVI) tests on the Hubble Kapton, Adhesive, and a Silver Mesh. This con- laminate) had impact hole sizes smaller than the 1,2 Space Telescope (HST) Solar Array Cells. figuration is shown if Figure 1. Three speci- photocell layer and larger than the RTV layer. The detailed results of that test program are mens were tested and each consisted of two The support layer exhibited slight de- provided in JSC technical report 28307 titled photocells; only one cells was impacted during lamination. Hypervelocity Impact Tests on Hubble Space each HVI test. The estimated areal density Figure 4 shows the relation between the Telescope (HST) Solar Array Cells. (mass per unit area) of the test specimens is through hole diameter (D3) and Projectile Ki- In a four-year period of operation, the HST 0.1527 grams per square centimeter. netic Energy. Edge impacts typically result in Solar Arrays are estimated to be impacted by The Hypervelocity Impact Test Facility greater damage to the target than impacts far approximately 40,000 particles greater than 10 and White Sands Test Facility 0.17” caliber from the edges. Using the data from non-edge microns, of which several hundred will perfo- two-stage light gas gun were used for this test impacts, a through hole diameter prediction rate the arrays.3 By conducting HVI tests with program. A total of five tests were conducted equation was developed and is given below: known particles, hypervelocity impact damage with Al 2017-T4 spherical projectiles ranging in 1/3 D3=0.926 KEn – 0.169 (1) characteristics of the solar cells and their corre- size from 0.4 mm to 0.8 mm. Each specimen lation to particle size can be determined. With was normally impacted (0°) on the solar cell Where D3 is the diameter of the through hole this data, on-orbit impact particle parameters glass side at approximately 7.0 km/s. Character- (mm) and KEn is the normal component of the (size, velocity, angle, and density) can be more istic damage seen from these tests is shown in projectile kinetic energy (J). Figure 4 illustrates accurately defined. This allows a determination Figure 2 and Figure 3. the impact data and correlation using Equation of whether the impactor was a naturally occur- All test articles exhibited similar HVI 1. Equation 2 can be use to estimate projectile ring meteoroid or man-made orbital debris and characteristics that can be differentiated by (Continued on page 3) Figure 1. Hubble Space Telescope Solar Cell Cross-section Figure 3. Characteristic Solar Cell Impact Damage (cross-section) Figure 2. Characteristic Solar Cell Impact Damage (front view) 2 The Orbital Debris Quarterly News NEWS Hubble Space Telescope Solar Array Hypervelocity Impact Tests, Cont’d (Continued from page 2) diameter, d (cm), resulting in a given solar cell hole diameter, D3 (mm). This form of the equa- 2.5 tion is useful in BUMPER code predictions. -1/3 -2/3 -2/3 2 Hole Dia (mm) = d= 0.169(D3 + 0.169)ρ V cos θ (2) 0.926 K.E.1/3 - Edge Impact 3 Where ρ is projectile density (g/cm ), V is im- 1.5 0.169 pact speed (km/s), and θ is the impact angle measured from the target normal (deg).
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