Fw: [Astronomy-net] Astro News
- -----Oorspronkelijk bericht-----
Van: Starlord <starlord@...>
Aan: Astro-net <Astrofirstname.lastname@example.org>
CC: astronomy-net <Astronomyemail@example.com>; 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
|Jupiter's volcanically active moon Io. At 14:32 Universal Time (9:32
|EST), the spacecraft passed only 199 kilometers above Io's surface.
|data will be transmitted and analyzed over the coming weeks.
|Although battered by Jupiter's strong radiation, Galileo continues to
|useful imagery and other data. While it isn't completely official, the
|spacecraft is now operating under its second mission extension. The
|extension, called the Galileo Europa Mission, ostensibly ended on
|31st, following a flyby of Europa on January 3rd. As long as Galileo
|researchers hope to continue using it. Its future schedule includes
|flyby on February 20th, flybys of Ganymede on May 20th and December
|joint observations of Jupiter with the Cassini spacecraft at the end
|NEW QUASAR DISTANCE RECORD
|Astronomers have found a new record holder for most distant quasar.
|Stern (Jet Propulsion Laboratory) and his colleagues uncovered the
|using the 5-meter Hale Telescope atop Palomar Mountain and the 4-meter
|Telescope at Kitt Peak. The quasar's spectrum was subsequently
|Hawaii's Keck Observatory. The calculated redshift of 5.5 means that
|recessional velocity of the quasar is stretching the wavelengths of
|times, implying that the light was emitted when the universe was
|a billion years old. The researchers' results will appear in an
|of Astrophysical Journal Letters. Although this is the most-distant
|known so far, it is not the absolute distance record holder. To date,
|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
|over western Canada has been recovered and is undergoing tests at
|Johnson Space Center. A 6 ounce chunk was found on a snow-covered
|interplanetary debris slammed into Earth's atmosphere on January 18th
|exploding 25 kilometers in the air just south of Whitehorse, Yukon
|THIS WEEK'S "SKY AT A GLANCE"
| Some daily events in the changing sky, from the editors of SKY &
|FEB. 27 -- SUNDAY
| * The 8th-magnitude asteroid Pallas is passing the star clusters M46
|this evening and for the next two evenings. See the finder chart in
|February Sky & Telescope, page 96, or at
|FEB. 28 -- MONDAY
| * Some doorstep astronomy: this week, the brightest star nearly
|overhead as twilight fades is Capella (assuming you live at a
|latitude). The brightest light in the west-southwest is Jupiter. The
|in the south-southeast is Sirius.
|FEB. 29 -- TUESDAY
| * Happy leap day! This is the first leap day in a year ending in -00
|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
|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
|MARCH 2 -- THURSDAY
| * Jupiter's Great Red Spot should cross Jupiter's central meridian
|imaginary line down the center of the planet's disk from pole to pole)
|7:52 p.m. EST. The "red" spot is currently very pale orange-tan. It
|visible in a good 4- or 6-inch telescope if the atmospheric seeing is
|and steady. For all predicted Red Spot transit times, see
| * Venus and a thin waning crescent moon will shine together very low
|dawn Friday morning. About 30 or 40 minutes before sunrise, look just
|the east-southeast horizon. The Moon is to Venus's right (and perhaps
|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
|evening. Sirius appears so bright (magnitude -1.44) for two reasons:
|close as stars go, only 8.6 light-years away, and it really is bright,
|out 22 times as much light as our Sun.
|MARCH 4 -- SATURDAY
| * Sirius forms the bottom corner of the equilateral Winter Triangle.
|well to Sirius's upper left for bright Procyon. Look the same distance
|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
|Look for it about 30 to 40 minutes before sunrise.
|MARS (magnitude +1.3) glows dim orange-red in the west during and
|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
|left. The two appear 10 degrees apart, the width of your fist held at
|length. Watch Jupiter, Saturn, and Mars draw closer together for the
|URANUS and NEPTUNE are hidden in the glow of dawn.
|PLUTO (magnitude 14 in Ophiuchus) is in the south-southeast before
|The Year is 2259, The Name of the Place is Babylon 5
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