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Fw: [Astronomy-net] Astro News

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  • Jeroen Kumeling
    ... Van: Starlord Aan: Astro-net CC: astronomy-net ; Astronomy
    Message 1 of 1 , Feb 28, 2000
      -----Oorspronkelijk bericht-----
      Van: Starlord <starlord@...>
      Aan: Astro-net <Astro-net@egroups.com>
      CC: astronomy-net <Astronomy-net@onelist.com>; Astronomy
      <astronomy@...>
      Datum: zondag 27 februari 2000 17:34
      Onderwerp: [Astronomy-net] Astro News


      |From: "Starlord" <starlord@...>
      |
      |GALILEO MISSION LIVES ON
      |
      |On February 22nd, the Galileo spacecraft made its third and closest
      |flyby of
      |Jupiter's volcanically active moon Io. At 14:32 Universal Time (9:32
      |a.m.
      |EST), the spacecraft passed only 199 kilometers above Io's surface.
      |Images and
      |data will be transmitted and analyzed over the coming weeks.
      |
      |Although battered by Jupiter's strong radiation, Galileo continues to
      |provide
      |useful imagery and other data. While it isn't completely official, the
      |Galileo
      |spacecraft is now operating under its second mission extension. The
      |first
      |extension, called the Galileo Europa Mission, ostensibly ended on
      |January
      |31st, following a flyby of Europa on January 3rd. As long as Galileo
      |works,
      |researchers hope to continue using it. Its future schedule includes
      |another Io
      |flyby on February 20th, flybys of Ganymede on May 20th and December
      |28th, and
      |joint observations of Jupiter with the Cassini spacecraft at the end
      |of the
      |year.
      |
      |NEW QUASAR DISTANCE RECORD
      |
      |Astronomers have found a new record holder for most distant quasar.
      |Daniel
      |Stern (Jet Propulsion Laboratory) and his colleagues uncovered the
      |object
      |using the 5-meter Hale Telescope atop Palomar Mountain and the 4-meter
      |Mayall
      |Telescope at Kitt Peak. The quasar's spectrum was subsequently
      |obtained at
      |Hawaii's Keck Observatory. The calculated redshift of 5.5 means that
      |the
      |recessional velocity of the quasar is stretching the wavelengths of
      |light 6.5
      |times, implying that the light was emitted when the universe was
      |perhaps about
      |a billion years old. The researchers' results will appear in an
      |upcoming issue
      |of Astrophysical Journal Letters. Although this is the most-distant
      |quasar
      |known so far, it is not the absolute distance record holder. To date,
      |that
      |honor is held by a galaxy with a redshift of 6.68.
      |
      |YUKON METEORITE BEING TESTED
      |
      |According to the Anchorage Daily News a piece of the fireball that
      |exploded
      |over western Canada has been recovered and is undergoing tests at
      |NASA's
      |Johnson Space Center. A 6 ounce chunk was found on a snow-covered
      |lake. The
      |interplanetary debris slammed into Earth's atmosphere on January 18th
      |exploding 25 kilometers in the air just south of Whitehorse, Yukon
      |Territory.
      |
      |
      |THIS WEEK'S "SKY AT A GLANCE"
      |
      | Some daily events in the changing sky, from the editors of SKY &
      |TELESCOPE.
      |
      |FEB. 27 -- SUNDAY
      |
      | * The 8th-magnitude asteroid Pallas is passing the star clusters M46
      |and M47
      |this evening and for the next two evenings. See the finder chart in
      |the
      |February Sky & Telescope, page 96, or at
      |http://www.skypub.com/sights/skyevents/0002skyevents.html .
      |
      |FEB. 28 -- MONDAY
      |
      | * Some doorstep astronomy: this week, the brightest star nearly
      |straight
      |overhead as twilight fades is Capella (assuming you live at a
      |mid-northern
      |latitude). The brightest light in the west-southwest is Jupiter. The
      |brightest
      |in the south-southeast is Sirius.
      |
      |FEB. 29 -- TUESDAY
      |
      | * Happy leap day! This is the first leap day in a year ending in -00
      |since
      |1600, nine years before Galileo used his first telescope.
      |
      |MARCH 1 -- WEDNESDAY
      |
      | * The eclipsing variable star Algol should be in one of its periodic
      |dimmings, magnitude 3.4 instead of its usual 2.1, for a couple hours
      |centered
      |on 7:56 p.m. EST. Algol takes several additional hours to fade and to
      |brighten. For a timetable of all its predicted minima see
      |http://www.skypub.com/sights/variables/algol.html .
      |
      |MARCH 2 -- THURSDAY
      |
      | * Jupiter's Great Red Spot should cross Jupiter's central meridian
      |(the
      |imaginary line down the center of the planet's disk from pole to pole)
      |around
      |7:52 p.m. EST. The "red" spot is currently very pale orange-tan. It
      |should be
      |visible in a good 4- or 6-inch telescope if the atmospheric seeing is
      |sharp
      |and steady. For all predicted Red Spot transit times, see
      |http://www.skypub.com/sights/moonplanets/redspot.html .
      |
      | * Venus and a thin waning crescent moon will shine together very low
      |in the
      |dawn Friday morning. About 30 or 40 minutes before sunrise, look just
      |above
      |the east-southeast horizon. The Moon is to Venus's right (and perhaps
      |a bit
      |higher, depending on your location). Binoculars will help.
      |
      |MARCH 3 -- FRIDAY
      |
      | * More doorstep astronomy: This is the time of year when Sirius, the
      |brightest true star in the night sky, shines highest in the south in
      |early
      |evening. Sirius appears so bright (magnitude -1.44) for two reasons:
      |It's very
      |close as stars go, only 8.6 light-years away, and it really is bright,
      |putting
      |out 22 times as much light as our Sun.
      |
      |MARCH 4 -- SATURDAY
      |
      | * Sirius forms the bottom corner of the equilateral Winter Triangle.
      |Look
      |well to Sirius's upper left for bright Procyon. Look the same distance
      |to its
      |upper right for orange-red Betelgeuse.
      |
      |
      | ============================
      | THIS WEEK'S PLANET ROUNDUP
      | ============================
      |
      |MERCURY is hidden in the glare of the Sun.
      |
      |VENUS (magnitude -3.9) is barely above the east-southeast horizon
      |during dawn.
      |Look for it about 30 to 40 minutes before sunrise.
      |
      |MARS (magnitude +1.3) glows dim orange-red in the west during and
      |shortly
      |after dusk. Look well to the lower right of bright Jupiter.
      |
      |JUPITER is the brightest "star" in the early-evening sky
      |(magnitude -2.2). It
      |shines in the west-southwest at dusk and sets around 10 p.m.
      |
      |SATURN (magnitude +0.3) is the dimmer, yellowish "star" to Jupiter's
      |upper
      |left. The two appear 10 degrees apart, the width of your fist held at
      |arm's
      |length. Watch Jupiter, Saturn, and Mars draw closer together for the
      |next five
      |weeks.
      |
      |URANUS and NEPTUNE are hidden in the glow of dawn.
      |
      |PLUTO (magnitude 14 in Ophiuchus) is in the south-southeast before
      |dawn.
      |
      |The Year is 2259, The Name of the Place is Babylon 5
      |http://www.whitelakeweb.com/siar
      |
      |
      |
      |
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