Sub-orbital spaceflight

Video of sub-orbital spaceflight of Black Brant IX sounding rocket
Sub-orbital human spaceflight (FAI-defined space border)
Name Year Flights Location
Mercury-Redstone 3
Mercury-Redstone 4
1961 2 Cape Canaveral
X-15 Flight 90
X-15 Flight 91
1963 2 Edwards AFB
Soyuz 18a 1975 1 Baikonur Cosmodrome
SpaceShipOne Flight 15P
SpaceShipOne Flight 16P
SpaceShipOne Flight 17P
2004 3 Mojave Air and Space Port
Blue Origin NS-16[1]
Blue Origin NS-18
Blue Origin NS-19
2021 3 Corn Ranch
Blue Origin NS-20
Blue Origin NS-21

Blue Origin NS-22

2022 3
Blue Origin NS-25 2024 1
Sub-orbital human spaceflight (United States-defined space border; excluding those above)
Name Year Flights Location
X-15 Flight 62 1962 1 Edwards AFB
X-15 Flight 77
X-15 Flight 87
1963 2
X-15 Flight 138
X-15 Flight 143
X-15 Flight 150
X-15 Flight 153
1965 4
X-15 Flight 174 1966 1
X-15 Flight 190
X-15 Flight 191
1967 2
X-15 Flight 197 1968 1
Soyuz MS-10 2018 1 Baikonur Cosmodrome
VSS Unity VP-03 2018 1 Mojave Air and Space Port
VSS Unity VF-01 2019 1
VSS Unity Unity21
VSS Unity Unity22
2021 2 Spaceport America
VSS Unity Unity25
Galactic 01
Galactic 02
Galactic 03
Galactic 04
Galactic 05
2023 6 Spaceport America
Galactic 06
Galactic 07
2024 2 Spaceport America

A sub-orbital spaceflight is a spaceflight in which the spacecraft reaches outer space, but its trajectory intersects the surface of the gravitating body from which it was launched. Hence, it will not complete one orbital revolution, will not become an artificial satellite nor will it reach escape velocity.

For example, the path of an object launched from Earth that reaches the Kármán line (about 83 km [52 mi] – 100 km [62 mi][2] above sea level), and then falls back to Earth, is considered a sub-orbital spaceflight. Some sub-orbital flights have been undertaken to test spacecraft and launch vehicles later intended for orbital spaceflight. Other vehicles are specifically designed only for sub-orbital flight; examples include crewed vehicles, such as the X-15 and SpaceShipTwo, and uncrewed ones, such as ICBMs and sounding rockets.

Flights which attain sufficient velocity to go into low Earth orbit, and then de-orbit before completing their first full orbit, are not considered sub-orbital. Examples of this include flights of the Fractional Orbital Bombardment System.

A flight that does not reach space is still sometimes called sub-orbital, but cannot officially be classified as a "sub-orbital spaceflight". Usually a rocket is used, but some experimental sub-orbital spaceflights have also been achieved via the use of space guns.[3]

Altitude requirement

Isaac Newton's Cannonball. Paths A and B depict a sub-orbital trajectory.

By definition, a sub-orbital spaceflight reaches an altitude higher than 100 km (62 mi) above sea level. This altitude, known as the Kármán line, was chosen by the Fédération Aéronautique Internationale because it is roughly the point where a vehicle flying fast enough to support itself with aerodynamic lift from the Earth's atmosphere would be flying faster than orbital speed.[4] The US military and NASA award astronaut wings to those flying above 50 mi (80 km),[5] although the U.S. State Department does not show a distinct boundary between atmospheric flight and spaceflight.[6]

Orbit

During freefall the trajectory is part of an elliptic orbit as given by the orbit equation. The perigee distance is less than the radius of the Earth R including atmosphere, hence the ellipse intersects the Earth, and hence the spacecraft will fail to complete an orbit. The major axis is vertical, the semi-major axis a is more than R/2. The specific orbital energy is given by:

where is the standard gravitational parameter.

Almost always a < R, corresponding to a lower than the minimum for a full orbit, which is

Thus the net extra specific energy needed compared to just raising the spacecraft into space is between 0 and .

Speed, range, and altitude

To minimize the required delta-v (an astrodynamical measure which strongly determines the required fuel), the high-altitude part of the flight is made with the rockets off (this is technically called free-fall even for the upward part of the trajectory). (Compare with Oberth effect.) The maximum speed in a flight is attained at the lowest altitude of this free-fall trajectory, both at the start and at the end of it.[citation needed]

If one's goal is simply to "reach space", for example in competing for the Ansari X Prize, horizontal motion is not needed. In this case the lowest required delta-v, to reach 100 km altitude, is about 1.4 km/s. Moving slower, with less free-fall, would require more delta-v.[citation needed]

Compare this with orbital spaceflights: a low Earth orbit (LEO), with an altitude of about 300 km, needs a speed around 7.7 km/s, requiring a delta-v of about 9.2 km/s. (If there were no atmospheric drag the theoretical minimum delta-v would be 8.1 km/s to put a craft into a 300-kilometer high orbit starting from a stationary point like the South Pole. The theoretical minimum can be up to 0.46 km/s less if launching eastward from near the equator.)[citation needed]

For sub-orbital spaceflights covering a horizontal distance the maximum speed and required delta-v are in between those of a vertical flight and a LEO. The maximum speed at the lower ends of the trajectory are now composed of a horizontal and a vertical component. The higher the horizontal distance covered, the greater the horizontal speed will be. (The vertical velocity will increase with distance for short distances but will decrease with distance at longer distances.) For the V-2 rocket, just reaching space but with a range of about 330 km, the maximum speed was 1.6 km/s. Scaled Composites SpaceShipTwo which is under development will have a similar free-fall orbit but the announced maximum speed is 1.1 km/s (perhaps because of engine shut-off at a higher altitude).[citation needed][needs update]

For larger ranges, due to the elliptic orbit the maximum altitude can be much more than for a LEO. On a 10,000-kilometer intercontinental flight, such as that of an intercontinental ballistic missile or possible future commercial spaceflight, the maximum speed is about 7 km/s, and the maximum altitude may be more than 1300 km. Any spaceflight that returns to the surface, including sub-orbital ones, will undergo atmospheric reentry. The speed at the start of the reentry is basically the maximum speed of the flight. The aerodynamic heating caused will vary accordingly: it is much less for a flight with a maximum speed of only 1 km/s than for one with a maximum speed of 7 or 8 km/s.[citation needed]

The minimum delta-v and the corresponding maximum altitude for a given range can be calculated, d, assuming a spherical Earth of circumference 40000 km and neglecting the Earth's rotation and atmosphere. Let θ be half the angle that the projectile is to go around the Earth, so in degrees it is 45°×d/10000 km. The minimum-delta-v trajectory corresponds to an ellipse with one focus at the centre of the Earth and the other at the point halfway between the launch point and the destination point (somewhere inside the Earth). (This is the orbit that minimizes the semi-major axis, which is equal to the sum of the distances from a point on the orbit to the two foci. Minimizing the semi-major axis minimizes the specific orbital energy and thus the delta-v, which is the speed of launch.) Geometrical arguments lead then to the following (with R being the radius of the Earth, about 6370 km):

The altitude of apogee is maximized (at about 1320 km) for a trajectory going one quarter of the way around the Earth (10000 km). Longer ranges will have lower apogees in the minimal-delta-v solution.

(where g is the acceleration of gravity at the Earth's surface). The Δv increases with range, leveling off at 7.9 km/s as the range approaches 20000 km (halfway around the world). The minimum-delta-v trajectory for going halfway around the world corresponds to a circular orbit just above the surface (of course in reality it would have to be above the atmosphere). See lower for the time of flight.

An intercontinental ballistic missile is defined as a missile that can hit a target at least 5500 km away, and according to the above formula this requires an initial speed of 6.1 km/s. Increasing the speed to 7.9 km/s to attain any point on Earth requires a considerably larger missile because the amount of fuel needed goes up exponentially with delta-v (see Rocket equation).

The initial direction of a minimum-delta-v trajectory points halfway between straight up and straight toward the destination point (which is below the horizon). Again, this is the case if the Earth's rotation is ignored. It is not exactly true for a rotating planet unless the launch takes place at a pole.[7]

Flight duration

In a vertical flight of not too high altitudes, the time of the free-fall is both for the upward and for the downward part the maximum speed divided by the acceleration of gravity, so with a maximum speed of 1 km/s together 3 minutes and 20 seconds. The duration of the flight phases before and after the free-fall can vary.[citation needed]

For an intercontinental flight the boost phase takes 3 to 5 minutes, the free-fall (midcourse phase) about 25 minutes. For an ICBM the atmospheric reentry phase takes about 2 minutes; this will be longer for any soft landing, such as for a possible future commercial flight.[citation needed] Test flight 4 of the SpaceX 'Starship' performed such a flight with a lift off from Texas and a simulated soft touchdown in the Indian Ocean 66 minutes after liftoff.

Sub-orbital flights can last from just seconds to days. Pioneer 1 was NASA's first space probe, intended to reach the Moon. A partial failure caused it to instead follow a sub-orbital trajectory, reentering the Earth's atmosphere 43 hours after launch.[8]

To calculate the time of flight for a minimum-delta-v trajectory, according to Kepler's third law, the period for the entire orbit (if it did not go through the Earth) would be:

Using Kepler's second law, we multiply this by the portion of the area of the ellipse swept by the line from the centre of the Earth to the projectile:

This gives about 32 minutes for going a quarter of the way around the Earth, and 42 minutes for going halfway around. For short distances, this expression is asymptotic to .

From the form involving arccosine, the derivative of the time of flight with respect to d (or θ) goes to zero as d approaches 20000 km (halfway around the world). The derivative of Δv also goes to zero here. So if d = 19000 km, the length of the minimum-delta-v trajectory will be about 19500 km, but it will take only a few seconds less time than the trajectory for d = 20000 km (for which the trajectory is 20000 km long).

Flight profiles

Profile for the first crewed American sub-orbital flight, 1961. Launch rocket lifts the spacecraft for the first 2:22 minutes. Dashed line: zero gravity.
Science and Mechanics cover of November 1931, showing a proposed sub-orbital spaceship that would reach an altitude 700 miles (1,100 km) on its one hour trip from Berlin to New York.

While there are a great many possible sub-orbital flight profiles, it is expected that some will be more common than others.

The X-15 (1958–1968) was launched to an altitude of 13.7 km by a B-52 mothership, lifted itself to approximately 100 km, and then glided to the ground.

Ballistic missiles

The first sub-orbital vehicles which reached space were ballistic missiles. The first ballistic missile to reach space was the German V-2, the work of the scientists at Peenemünde, on October 3, 1942, which reached an altitude of 53 miles (85 km).[9] Then in the late 1940s the US and USSR concurrently developed missiles all of which were based on the V-2 Rocket, and then much longer range Intercontinental Ballistic Missiles (ICBMs). There are now many countries who possess ICBMs and even more with shorter range Intermediate Range Ballistic Missiles (IRBMs).[citation needed]

Tourist flights

Sub-orbital tourist flights will initially focus on attaining the altitude required to qualify as reaching space. The flight path will be either vertical or very steep, with the spacecraft landing back at its take-off site.

The spacecraft will shut off its engines well before reaching maximum altitude, and then coast up to its highest point. During a few minutes, from the point when the engines are shut off to the point where the atmosphere begins to slow down the downward acceleration, the passengers will experience weightlessness.

Megaroc had been planned for sub-orbital spaceflight by the British Interplanetary Society in the 1940s.[10][11]

In the autumn of 1945, the group M. Tikhonravov K. and N. G. Chernysheva at NII-4 rocket artillery Academy of Sciences technology on its own initiative the first stratospheric rocket project was developed by VR-190 for vertical flight two pilots to an altitude of 200 km based on captured German ballistic rocket V-2.[12]

In 2004, a number of companies worked on vehicles in this class as entrants to the Ansari X Prize competition. The Scaled Composites SpaceShipOne was officially declared by Rick Searfoss to have won the competition on October 4, 2004, after completing two flights within a two-week period.

In 2005, Sir Richard Branson of the Virgin Group announced the creation of Virgin Galactic and his plans for a 9-seat capacity SpaceShipTwo named VSS Enterprise. It has since been completed with eight seats (one pilot, one co-pilot and six passengers) and has taken part in captive-carry tests and with the first mother-ship WhiteKnightTwo, or VMS Eve. It has also completed solitary glides, with the movable tail sections in both fixed and "feathered" configurations. The hybrid rocket motor has been fired multiple times in ground-based test stands, and was fired in a powered flight for the second time on 5 September 2013.[13] Four additional SpaceShipTwos have been ordered and will operate from the new Spaceport America. Commercial flights carrying passengers were expected in 2014, but became cancelled due to the disaster during SS2 PF04 flight. Branson stated, "[w]e are going to learn from what went wrong, discover how we can improve safety and performance and then move forwards together."[14]

Scientific experiments

A major use of sub-orbital vehicles today is as scientific sounding rockets. Scientific sub-orbital flights began in the 1920s when Robert H. Goddard launched the first liquid fueled rockets, however they did not reach space altitude. In the late 1940s, captured German V-2 ballistic missiles were converted into V-2 sounding rockets which helped lay the foundation for modern sounding rockets.[15] Today there are dozens of different sounding rockets on the market, from a variety of suppliers in various countries. Typically, researchers wish to conduct experiments in microgravity or above the atmosphere.

Sub-orbital transportation

Research, such as that done for the X-20 Dyna-Soar project suggests that a semi-ballistic sub-orbital flight could travel from Europe to North America in less than an hour.

However, the size of rocket, relative to the payload, necessary to achieve this, is similar to an ICBM. ICBMs have delta-v's somewhat less than orbital; and therefore would be somewhat cheaper than the costs for reaching orbit, but the difference is not large.[16]

Due to the high cost of spaceflight, suborbital flights are likely to be initially limited to high value, very high urgency cargo deliveries such as courier flights, military fast-response operations or space tourism.[opinion]

The SpaceLiner is a hypersonic suborbital spaceplane concept that could transport 50 passengers from Australia to Europe in 90 minutes or 100 passengers from Europe to California in 60 minutes.[17] The main challenge lies in increasing the reliability of the different components, particularly the engines, in order to make their use for passenger transportation on a daily basis possible.

SpaceX is potentially considering using their Starship as a sub-orbital point-to-point transportation system.[18]

Notable uncrewed sub-orbital spaceflights

Crewed sub-orbital spaceflights

Above 100 km (62.14 mi) in altitude.

Date (GMT) Mission Crew Country Remarks
1 1961-05-05 Mercury-Redstone 3 Alan Shepard  United States First crewed sub-orbital spaceflight, first American in space
2 1961-07-21 Mercury-Redstone 4 Virgil Grissom  United States Second crewed sub-orbital spaceflight, second American in space
3 1963-07-19 X-15 Flight 90 Joseph A. Walker  United States First winged craft in space
4 1963-08-22 X-15 Flight 91 Joseph A. Walker  United States First person and spacecraft to make two flights into space
5 1975-04-05 Soyuz 18a Vasili Lazarev
Oleg Makarov
 Soviet Union Failed orbital launch. Aborted after malfunction during stage separation
6 2004-06-21 SpaceShipOne flight 15P Mike Melvill  United States First commercial spaceflight
7 2004-09-29 SpaceShipOne flight 16P Mike Melvill  United States First of two flights to win Ansari X-Prize
8 2004-10-04 SpaceShipOne flight 17P Brian Binnie  United States Second X-Prize flight, clinching award
9 2021-07-20 Blue Origin NS-16 Jeff Bezos
Mark Bezos
Wally Funk
Oliver Daemen
 United States First crewed Blue Origin flight
10 2021-10-13 Blue Origin NS-18 Audrey Powers
Chris Boshuizen
Glen de Vries
William Shatner
 United States Second crewed Blue Origin flight
11 2021-12-11 Blue Origin NS-19 Laura Shepard Churchley
Michael Strahan
Dylan Taylor
Evan Dick
Lane Bess
Cameron Bess
 United States Third crewed Blue Origin flight
12 2022-03-31 Blue Origin NS-20 Marty Allen
Sharon Hagle
Marc Hagle
Jim Kitchen
George Nield
Gary Lai
 United States Fourth crewed Blue Origin flight
13 2022-06-04 Blue Origin NS-21 Evan Dick
Katya Echazarreta
Hamish Harding
Victor Correa Hespanha
Jaison Robinson
Victor Vescovo
 United States Fifth crewed Blue Origin flight
14 2022-08-04 Blue Origin NS-22 Coby Cotton
Mário Ferreira
Vanessa O'Brien
Clint Kelly III
Sara Sabry
Steve Young
 United States Sixth crewed Blue Origin flight
15 2024-05-19 Blue Origin NS-25 Mason Angel
Sylvain Chiron
Ed Dwight
Kenneth Hess
Carol Schaller
Gopichand Thotakura
 United States Seventh crewed Blue Origin flight
Timeline of Space­Ship­One, Space­Ship­Two, CSXT and New Shepard sub-orbital flights. Where booster and capsule achieved different altitudes, the higher is plotted. In the SVG file, hover over a point to show details.

Future of crewed sub-orbital spaceflight

Private companies such as Virgin Galactic, Armadillo Aerospace (reinvented as Exos Aerospace), Airbus,[21] Blue Origin and Masten Space Systems are taking an interest in sub-orbital spaceflight, due in part to ventures like the Ansari X Prize. NASA and others are experimenting with scramjet-based hypersonic aircraft which may well be used with flight profiles that qualify as sub-orbital spaceflight. Non-profit entities like ARCASPACE and Copenhagen Suborbitals also attempt rocket-based launches.

See also

References

  1. ^ Foust, Jeff (20 July 2021). "Blue Origin launches Bezos on first crewed New Shepard flight". SpaceNews. Retrieved 20 Jul 2021.
  2. ^ https://scholar.smu.edu/cgi/viewcontent.cgi?article=1126&context=jalc
  3. ^ "Martlet". Archived from the original on 2010-09-26.
  4. ^ "100 km Altitude Boundary for Astronautics". Fédération Aéronautique Internationale. Archived from the original on 2011-08-09. Retrieved 2017-09-14.
  5. ^ Whelan, Mary (5 June 2013). "X-15 Space Pioneers Now Honored as Astronauts". nasa.gov. Archived from the original on 11 June 2017. Retrieved 4 May 2018.
  6. ^ "85. U.S. Statement, Definition and Delimitation of Outer Space And The Character And Utilization Of The Geostationary Orbit, Legal Subcommittee of the United Nations Committee on the Peaceful Uses of Outer Space at its 40th Session in Vienna from April". state.gov. Retrieved 4 May 2018.
  7. ^ Blanco, Philip (September 2020). "Modeling ICBM Trajectories Around a Rotating Globe with Systems Tool Kit". The Physics Teacher. 58 (7): 494–496. Bibcode:2020PhTea..58..494B. doi:10.1119/10.0002070. S2CID 225017449.
  8. ^ "Pioneer 1 - NSSDC ID: 1958-007A". NASA NSSDC.
  9. ^ Germany's V-2 Rocket, Kennedy, Gregory P.
  10. ^ Hollingham, Richard. "How a Nazi rocket could have put a Briton in space". bbc.com. Archived from the original on 14 November 2016. Retrieved 4 May 2018.
  11. ^ "Megaroc". www.bis-space.com. Archived from the original on 30 October 2016. Retrieved 4 May 2018.
  12. ^ Anatoli I. Kiselev; Alexander A. Medvedev; Valery A. Menshikov (December 2012). Astronautics: Summary and Prospects. Translated by V. Sherbakov; N. Novichkov; A. Nechaev. Springer Science & Business Media. pp. 1–2. ISBN 9783709106488.
  13. ^ "Scaled Composites: Projects - Test Logs for SpaceShipTwo". Archived from the original on 2013-08-16. Retrieved 2013-08-14.
  14. ^ "Branson on Virgin Galactic crash: 'Space is hard – but worth it'". CNET. Retrieved August 1, 2015.
  15. ^ "ch2". history.nasa.gov. Archived from the original on 2015-11-29. Retrieved 2015-11-28.
  16. ^ "The Space Review: Point-to-point suborbital transportation: sounds good on paper, but..." www.thespacereview.com. Archived from the original on 1 August 2017. Retrieved 4 May 2018.
  17. ^ Sippel, M. (2010). "Promising roadmap alternatives for the SpaceLiner" (PDF). Acta Astronautica. 66 (11–12): 1652–1658. Bibcode:2010AcAau..66.1652S. doi:10.1016/j.actaastro.2010.01.020.
  18. ^ Ralph, Eric (30 May 2019). "SpaceX CEO Elon Musk wants to use Starships as Earth-to-Earth transports". Teslarati. Retrieved 31 May 2019.
  19. ^ Walter Dornberger, Moewig, Berlin 1984. ISBN 3-8118-4341-9.
  20. ^ "Bumper Project". White Sands Missile Range. Archived from the original on 2008-01-10.
  21. ^ Amos, Jonathan (3 June 2014). "Airbus drops model 'space jet'". BBC News. Archived from the original on 4 May 2018. Retrieved 4 May 2018.

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Bush-era tariff agreement proposal This article needs to be updated. Please help update this article to reflect recent events or newly available information. (February 2017) Part of a series onInternational trade agreements Stages of economic integration around the World   Common market (EEA–Switzerland, ASEAN)   Customs union (CAN, EAC, EUCU, SACU)   Multilateral Free Trade Area (CEFTA, CISFTA, COMESA, EFTA, GAFTA, SAFTA, AANZFTA, PAFTA, SADCFTA, USMCA) Proposed …

2008 concert tour by Alicia Keys Not to be confused with I Am... (Beyoncé tour). As I Am TourTour by Alicia KeysPromotional poster for the tourAssociated albumAs I AmStart dateFebruary 28, 2008End dateDecember 20, 2008Legs4No. of shows41 in Europe39 in North America9 in Oceania5 in Asia94 totalBox officeUS $32 million ($45.28 in 2023 dollars)[1]Alicia Keys concert chronology Diary Tour(2005) As I Am Tour(2008) Freedom Tour(2010) The As I Am Tour was the third worldwide concert tour by A…

High TensionLagu oleh AKB48Sisi-AHigh TensionSisi-B Osae Kirenai Shoudou Happy End (Jenis A) Better (Jenis B) Hoshizora o Kimi ni (Jenis C) Shishunki no Adrenaline (Jenis D) Junjō Tired (Jenis E) Mata Anata no Koto o Kangaeteta (Edisi Teater) Dirilis16 November 2016 (2016-11-16)Format Singel maxi (CD) unduhan digital GenreJ-popLabelYou, Be Cool! / KingPenciptaYasushi Akimoto (lirik)Satori Shiraishi (Musik)Hiroshi Sasaki (Aransemen)ProduserYasushi AkimotoVideo musik di YouTubeHigh Tension H…

Season of television series Season of television series America's Next Top ModelSeason 22Cycle 22 castJudges Tyra Banks Kelly Cutrone J. Alexander No. of contestants14WinnerNyle DiMarco No. of episodes16ReleaseOriginal networkThe CWOriginal releaseAugust 5 (2015-08-05)[1] –December 4, 2015 (2015-12-04)[2]Additional informationFilming datesApril 6 (2015-04-06) –May 18, 2015 (2015-05-18)Season chronology← PreviousSeason 21 Next →Seaso…

Lyndsy FonsecaFonseca di panel serial televisi Nikita di San Diego Comic-Con, Juli 2010LahirLyndsy Marie Fonseca7 Januari 1987 (umur 37)Oakland, California, A.S.PekerjaanAktrisTahun aktif2000–sekarangSuami/istriMatthew Smiley ​(m. 2009⁠–⁠2013)​ Lyndsy Marie Fonseca (lahir 7 Januari 1987) adalah aktris Amerika Serikat yang dikenal sebagai pemeran Colleen Carlton di serial CBS The Young and the Restless dan Alexandra Alex Udinov di seria…

Pour les articles homonymes, voir Thrace (homonymie). Thraces Les Thraces du Ve au IIIe siècle av. J.-C. Période Milieu IIe millénaire av. J.-C. au le Ier siècle av. J.-C. Langue(s) Thrace. Religion Mythologie thraco-dace. Villes principales Seuthopolis, SardicaColonies grecques (Amphipolis, Apollonia, Odessos.) Région actuelle Thrace. Rois/monarques Térès Ier,Seuthès Ier,Seuthès III. modifier  Les Thraces sont un peuple formé d'un ensemble de nations…