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https://twitter.com/airandspace/status/1704967511320449336
4 avril 1975...Il y a 45 ans était émis le timbre Mariner 10 Article complet ici :https://souvenirsdespace.lebonforum.com/t425-philatelie-spatiale-usa-1975-mariner-10-venus-et-mercure?highlight=mariner
1973 November 3 - . 05:45 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas SLV-3D Centaur.Mariner 10 - . Payload: Mariner 73J. Mass: 526 kg (1,159 lb). Nation: USA. Agency: JPL, NASA. Program: Mariner. Class: Mercury. Type: Mercury probe. Spacecraft Bus: Mariner. Spacecraft: Mariner 10. USAF Sat Cat: 6919 . COSPAR: 1973-085A.An Atlas/Agena D launched Mariner 10 (Mariner Venus-Mercury) from the Eastern Test Range. The spacecraft was scheduled for Venus f lyby in February 1974 and Mercury in March 1974 - it would be the first space probe ever to approach Mercury. Mariner 10 was the first spacecraft to reach Mercury. Mariner 10 was placed in a parking orbit for 25 minutes after launch, then accelerated to a trans-Venus escape trajectory. The television and ultraviolet experiments were trained on the comet Kohoutek while the spacecraft was en route to its destination. The vehicle's first planetary encounter was with Venus on February 5, 1974, at a distance of 4200 km. Mariner 10 took 4,000 photos of Venus, which revealed a nearly round planet enveloped in smooth cloud layers. The gravity of Venus bent the orbit of the spacecraft and sent it towards Mercury. It crossed the orbit of Mercury on March 29, 1974, at 20:46 GMT, at a distance of 704 km from the surface. Photographs taken during the pass revealed an intensely cratered, Moon-like surface and a faint atmosphere of mostly helium. After the first flyby, Mariner 10 entered solar orbit, which permitted two more rendezvous with Mercury. On September 21, 1974, the second Mercury rendezvous, at an altitude of about 47,000 km, provided another opportunity to photograph the sunlit side of the planet and the south polar region. The third and final Mercury encounter on March 16, 1975, at an altitude of 327 km, yielded 300 photographs and magnetic field measurements. The vehicle was turned off March 24, 1975 when the supply of attitude-control gas was depleted.
3 novembre 1973Il y a 50 ans, la sonde Mariner 10 est lancée depuis Cape Canaveral. Elle survole Vénus le 3 février 1974 puis Mercure à 3 reprises entre Mars 1974 et Mars 1975 (et cela méritait bien un timbre en avril 1975)
3 November 1973. 05.45.00 UTC/GMT. Launch of Mariner 10 from Cape Canaveral LC-36B. NASA probe designed to fly by Mercury and Venus. First probe to reach Mercury.
✅ The 1st spacecraft to Mercury✅ The 1st mission to explore two planets (Mercury and Venus) ✅ The 1st to use a gravity assist to change its flight pathSee some of the 7,000+ photos Mariner 10 took: https://go.nasa.gov/3QARcBb
Embarking on the 1st two-planet mission Mariner 10 (Mariner-73J/Mariner-J) was launched on an Atlas-Centaur from LC-36B at KSC, OTD in 1973, imaging Earth & the Moon a few hours later. Following a close fly-by Venus 3 months later, it became the 1st spacecraft to explore Mercury.
50 years ago today, Mariner 10 launched. It was the first spacecraft to visit two planets, using Venus’ gravitational field to slingshot itself towards Mercury, saving fuel and picking up speed. This flight spare is on display in "Exploring the Planets." #AirSpacePhoto
5 February 1974. Mariner 10, NASA robotic spacecraft launched on 3 November 1973, made its closest approach to Venus (3,584 miles) at 17.01.00 UTC/GMT, sending the first pictures.
50 years ago today, Mariner 10 passed Venus!Mariner 10 was the 12th spacecraft to reach Venus and the 8th to return data from the planet, but the 1st to broadcast images of Venus back to Earth. 🏆More about Mariner 10 and its mission to Mercury: https://go.nasa.gov/3w1C3Rr
29.03.1974 Podczas pierwszego przelotu sonda zbliżyła się do powierzchni Merkurego na odległość 704 km.
Mariner 10, the 1st spacecraft sent to study Mercury, took the first closeup photos of the planet as it made its first flyby #OTD in 1974. Pictured is a mosaic of images taken by the spacecraft about 6 hours before closest approach. @NASASolarSystemBut that's not all…
https://twitter.com/NASAhistory/status/1641085302960795650
29 March 1974. Launched on 3 November 1973, NASA's Mariner 10 became the first probe to fly by the planet Mercury. The last of the Mariner program. The mission objectives were to measure Mercury's environment, atmosphere, surface, and planetary characteristics.
29 mars 1974Il y a 50 ans, Mariner 10 survole Mercure - c'est le premier survol de cette planète par une sonde.
Celebrating the 50th anniversary of our first close look at Mercury!Mariner 10 came within 437 miles of Mercury's surface, making it the first ever spacecraft to visit the planet, #OTD in 1974. https://go.nasa.gov/3VJs12a