Arecibo Observatory to be rebuilt as Puerto Rico commits $ 8 million for its reconstruction

1963: Arecibo Ionospheric Observatory Commissioned on November 1 for $ 9.7 million.

1965: One of his first accomplishments was to establish the rotation rate of Mercury, which turned out to be 59 days instead of the 88 days previously estimated.

1968: Sporadic radio pulses from the direction of the crab nebula supernova remnant found at Green Bank were shown by Arecibo to be from a 33 msec pulsar located in the nebula’s center.

1974: New high precision surface reflector installed, planetary radar transmitter installed.

1974: The first pulsar of a binary system was discovered, leading to an important confirmation of Einstein’s general theory of relativity and a 1993 Nobel Prize for astronomers Russell Hulse and Joseph Taylor.

1974: On November 16, the “Arecibo message” was broadcast in space in the direction of the globular star cluster M13 25,000 light years away.

The main purpose of the post was to demonstrate the capabilities of the newly installed equipment in the improved radio telescope and was an attempt to contact extraterrestrial intelligence.

1979: A large anomalous disturbance of ionospheric displacement (i.e. a wave from the upper atmosphere) moving from the southeast to the northwest was detected early in the morning – something the researchers had never seen before . The data helped define the probable cause as an airborne nuclear explosion over the Indian Ocean.

nineteen eighty one: The first radar maps of the geological surface of Venus are produced.

1982: The discovery of a strong “megamaser” emission of the hydroxyl (OH) molecule in the star galaxy Arp 220 (IC 4553).

1982: The discovery of millisecond pulsars, which rotate several hundred times per second. This demonstrated the existence of two classes of pulsars – millisecond pulsars and slower spinning pulsars, which rotate about once per second.

1989: The first measurement of the flow of hydrogen escaping from Earth is presented, based on measurements of the velocity distribution of atmospheric light emission of hydrogen in the upper atmosphere.

Early 90s: The first planets outside the solar system were discovered around the Pulsar B1257 + 12, a rapidly rotating pulsar with three Earth-like planets in orbit.

1992: In October, ice is discovered in shaded craters at the north pole of Mercury. Later observations also show ice in the craters of the South Pole.

1996: A helium ion layer is a common, but previously unrecognized, characteristic in the low latitude ionosphere near 600 km.

1998: The Arecibo Observatory “found” the Solar and Heliospheric Observatory (SOHO) spacecraft on July 28, after losing communications with the European Space Agency and NASA. by bouncing a radar signal off the satellite. SOHO’s mission has resumed and continues to produce data today.

May 2000: Radar observations of asteroid 216 Kleopatra reveal a metal-rich object shaped like a dog bone.

September 2000: Discovery that 2000 DP107 was the first near-Earth asteroid identified by radar as a binary system. The primary is roughly spherical with a diameter of half a mile and the smaller secondary, which orbits in 1.8 days, is about 1,000 feet.

2003: Evidence of hydrocarbon lakes on the Saturn Titan satellite is established using the Observatory’s planetary radar.

April 2004: Installation of Arecibo’s L-band power supply network, enabling a wide variety of astronomical surveys, including the discovery of pulsars, gas mapping in our galaxy and the search for other galaxies.

2005-2012: Radar imagery of Mars reveals lava flows and near-surface geological features not visible in visible images. This provides new information on the geology of the surface of Mars.

2006: The search for water ice in the permanent shadow of the Shackleton lunar crater disputes the presence of water ice on the lunar surface.

October 2006: Radar images of the moon’s south pole show no evidence of thick ice deposits.

November 2006: Radar images of binary asteroid (66391) 1999 KW4 in May 2001 and again in June 2002 reveal exotic physical and dynamic properties that may be common among near-Earth binaries.

March 2007: Radar images of Mercury reveal features that will be further investigated by the Messenger spacecraft in the coming years.

2007: Near-Earth asteroid 2005 PH5 has been observed to increase in rotational speed, due to non-uniform absorption and emission of solar radiation.

2007: Undetected radio lines of the hydrogen cyanide (HCN) molecule and the presence of the methanimine (CH2NH) molecule were recently discovered in the distant “star galaxy” Arp 220.

February 2008: Discovery of the first triple asteroid system among near-Earth asteroids. The asteroid, 2001 SN263, is about 1.5 miles in diameter, with two moons orbiting it.

2008-2012: Observations discover a radio explosion in the neighboring galaxy NGC 660, ten times brighter than a radio supernova.

2011: Observations of brown dwarfs find the coldest star to show the radio broadcast.

November 2011: Radar imagery of near-Earth asteroid 2005 YU55, which flew very close. This dark spheroid asteroid was approximately 1,148 feet in diameter.

2012: An ion-neutral chemistry model is developed to successfully describe thin layers of neutral metal atoms at altitudes above 62 miles.

More information: National Center for Astronomy and Ionosphere