The descent module arrived at Venus on 15 June 1985, two days after being released from the Vega 2 flyby probe. The module, a 1,500 kilograms (3,300 lb), 240 centimetres (7.9 ft) diameter sphere, contained a surface lander and a balloon explorer. The flyby probe performed a gravitational assist maneuver using Venus, and continued its mission to intercept the comet.[3]
Lander
The surface lander was identical to that of Vega 1 as well as the previous six Venera missions. The objective of the probe was the study of the atmosphere and the exposed surface of the planet. The scientific payload included a UV spectrometer, temperature and pressure sensors, a water concentration meter, a gas-phase chromatograph, an X-rayspectrometer, a mass spectrometer, and a surface sampling device. Several of these scientific tools (the UV spectrometer, the mass spectrograph, and the devices to measure pressure and temperature) were developed in collaboration with French scientists.[3] Since the probe made a nighttime landing, no images were taken.
The Vega 2 lander touched down at 03:00:50 UT on 15 June 1985 at around 7°08′S177°40′E / 7.14°S 177.67°E / -7.14; 177.67, in the northern region of Aphrodite Terra. The altitude of the touchdown site was 0.1 kilometres (330 ft) above the planetary mean radius. The measured pressure at the landing site was 91 atm and the temperature was 736 K (865 °F). The surface sample was found to be an anorthosite–troctolite rock, rarely found on Earth, but present in the lunar highlands, leading to the conclusion that the area was probably the oldest explored by any Venera vehicle. It transmitted data from the surface for 56 minutes.[4]
Balloon
Vega balloon probe on display at the Udvar-Hazy Center of the Smithsonian Institution.
The Vega 2 Lander/Balloon capsule entered the Venusian atmosphere (125 kilometres [78 mi] altitude) at 02:06:04 UT (Earth received time; Moscow time 05:06:04) on 15 June 1985 at roughly 11 kilometres per second (6.8 mi/s). At approximately 2:06:19 UT the parachute attached to the landing craft cap opened at an altitude of 64 kilometres (40 mi). The cap and parachute were released 15 seconds later at 63 kilometres (39 mi) altitude. The balloon package was pulled out of its compartment by parachute 40 seconds later at 61 kilometres (38 mi) altitude, at 7.45 degrees S, 179.8 degrees east. A second parachute opened at an altitude of 55 kilometres (34 mi), 200 seconds after entry, extracting the furled balloon.
The balloon was inflated 100 seconds later at 54 kilometres (34 mi) and the parachute and inflation system were jettisoned. The ballast was jettisoned when the balloon reached roughly 50 kilometres (31 mi) and the balloon floated back to a stable height between 53 and 54 kilometres (33 and 34 mi) some 15 to 25 minutes after entry. The mean stable height was 53.6 kilometres (33.3 mi), with a pressure of 535 millibars (535 hPa) and a temperature of 308–316 K (35–43 °C; 95–109 °F) in the middle, most active layer of the Venus three-tiered cloud system. The balloon drifted westward in the zonal wind flow with an average speed of about 66 metres per second (220 ft/s) at nearly constant latitude. The probe crossed the terminator from night to day at 9:10 UT on 16 June after traversing 7,400 kilometres (4,600 mi). The probe continued to operate in the daytime until the final transmission was received at 00:38 UT on 17 June from 7.5 S, 76.3 E after a total traverse distance of 11,100 kilometres (6,900 mi). It is not known how much further the balloon traveled after the final communication.[4]
Halley mission
After their encounters, the Vegas' motherships were redirected by Venus' gravity to intercept Halley's Comet.
The spacecraft initiated its encounter on March 7, 1986, by taking 100 photos of the comet from a distance of 14,000,000 kilometres (8,700,000 mi).
Vega 2 made its closest approach at 07:20 UT on March 9, 1986, at 8,030 kilometres (4,990 mi). The data intensive examination of the comet covered only the three hours around closest approach. They were intended to measure the physical parameters of the nucleus, such as dimensions, shape, temperature and surface properties, as well as to study the structure and dynamics of the coma, the gas composition close to the nucleus, the dust particles' composition and mass distribution as functions of distance to the nucleus and the cometary-solar wind interaction.
During the encounter, Vega 2 took 700 images of the comet, with better resolution than those from the twin Vega 1, partly due to the presence of less dust outside the coma at the time. Yet Vega 2 recorded an 80% power loss during the encounter as compared to Vega 1's 40%.
After further imaging sessions on 10 and 11 March 1986, Vega 2 finished its primary mission.
Post Halley
A 6 million kilometer distant flyby of 2101 Adonis was considered, however, Vega 2 didn't have enough fuel left to make the necessary orbital changes for the flyby.[5] Instead the Vega probes took the opportunity to measure the dust as they passed through the orbits of 72P/Denning–Fujikawa, Biela's Comet and 289P/Blanpain.[5]
Contact with Vega 2 was lost on 24 March 1987.[5] Vega 1 had previously exhausted its attitude control propellant on 30 January 1987.[5]
^ abcdUlivi, Paolo; Harland, David M (2009). Robotic Exploration of the Solar System Part 2 Hiatus and Renewal. Praxis Publishing. pp. 90–92. ISBN9780387789040.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).
.jpg)
.png)