... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... What would cause Earthт??s orbit to become more circular instead of its present elliptical orbit, and has this ever happened before? ... Gravitational interactions among the planets cause the ellipticities of the orbits to oscillate periodically by a few percent over millions of years. Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

... The physical data page presents data about the objects themselves. ... ( 0 ) Mercury I Sun 57910 87.97 7.00 0.21 - - ( 0 ) Venus II Sun 108200 224.70 3.39 0.01 - - ( 0 ) Earth III Sun 149600 365.26 0.00 0.02 - - ( 0 ) Mars IV Sun 227940 686.98 1.85 0.09 - - ( 0 ) Jupiter V Sun 778330 4332.71 1.31 0.05 - - ( 0 ) Saturn VI Sun 1429400 10759.50 2.49 0.06 - - ( 0 ) Uranus VII Sun 2870990 30685.00 0.77 0.05 Herschel 1781 ( 0 ) Neptune VIII Sun 4504300 60190.00 1.77 0.01 Adams ( 9 ) 1846 ( 0 )...

Outer Natural Satellites Orbits Ephemerides. Outer satellites of Saturn . ... Values of the orbital elements [ output e sin( ), e cos( ), sin(i) sin( ), sin(i) cos( ) ] . ... Choose Satellite S6 - Phoebe S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S50 S51 S52 S/2004 S7 S/2004 S12 S/2004 S13 S/2004 S17 S/2006 S1 S/2006 S3 S/2007 S2 S/2007 S3 of Saturn . ... Enter initial date (years) . ... inclination deg. pericenter deg. node deg. ...

... Historical Data . Orbital Data . Physical Data . ... Sun . ... Jupiter . ... Saturn . ... William Herschel . ... William Cranch Bond . ... William Henry Pickering . Uranus . ... 1986 . Voyager 2 . ... William Lassell . ... J. Christy Key: Name Name of the planet or satellite. Orbits Sun or planet about which it orbits. ...

What's my orbit? Name of planet |Distance from the |Angle from the |Time for one orbit| | ... Pick a date, any date and write down all the information you can from those discs from each planet. Date.. Use the graph paper below to plot the length of the year (how long it takes to go once around The Sun on the Y (vertical axis) and the distance from the sun on the X (horizontal axis). ... What does the graph tell you about how long it takes each planet to orbit The Sun? ...

History of Space Exploration . ... Space History Introduction . ... Chronology of Solar System Discovery This is a partial list of past, present, and future planetary and solar missions; for a complete account, please see the Space Exploration Chronology. Space exploration is becoming increasingly internationalized; as a result, the national designations listed here are not completely representative of the true nature of all projects. ... Apollo Lunar Surface Journal . ... Mariner Missions . ...

Deep Time: Earth's history and future By Colin Johnston, Armagh Planetarium Earth 4.54 billion years ago Forms in Sun's protoplanetary disc S un Elsewhere in Solar System Other planets form. ... Hot and airless Sun a subgiant, diameter 1.5 its current value, 2 6.4 billion years from no w ? ... Earth cools 20 million years later? ... Core temperature about 55 million°C, helium flash, followed by the Sun shrinking Sun is 10 times its current diameter, luminosity 20-50% current value. ...

The Mars Flag has a different design on the reverse side. obverse side of flag . ... The orbit lines on the obverse cross the Sun on the lower half of the flag and appear to go behind the Sun on the upper half of the flag. The reverse side has the orbits lines continuing around the Sun on the upper half of the flag. ... The Mars Flag reverse side is a continuation of the obverse side and not just a different design on the back and not a mirror image of the obverse. Main Flag Background Color . ...

Astronomy Picture of the Day . ... 11.10.2000 . ... Credit: Cassini Imaging Team , Cassini Project , NASA Explanation: A new spacecraft has entered the outer Solar System: Cassini . Launched in 1997 and bound for Saturn in 2004, Cassini sent back the above image last week while approaching the giant planet Jupiter . ... October 2000 . ... 1997 1998 . ... Publications with keywords: Jupiter - spacecraft - cassini spacecraft . Publications with words: Jupiter - spacecraft - cassini spacecraft . ...

Saturn: The beauty of the rings. Saturn . ... Belongs to the giant planets . It has no definite solid surface. ... The free fall acceleration at the Saturn surface near equator is 9,06 m/s^2 . ... In the centre of the planet the temperature is about 20000K. The satellites . ... The rings of Saturn . ... It is proved that Saturn's rings (as well as the other planet's) are the fragments of the great cloud being near the planet with million kilometres length (see how the rings were formed ). ...

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

... 8, ``Celestial Mechanics'', 2002 The motion of asteroids at the 5:2 resonance with Jupiter T. Yu. Galushina Tomsk State University, Tomsk, Russia The present work is devoted to investigation of Near­Earth asteroids (NEAs) motion at the 5:2 resonance with Jupiter. ... The initial parameters of orbits were taken from Bowell catalog on January 26, 2002 (ftp://ftp.lowell.edu/pub/elgb/astorb.dat). ... Orbital evolution of near--Earth asteroids close to mean motion resonances. ...

... Анк а дня . ... NASA отправит к Юпитеру корабль на ядерной тяге . ... Американское космическое агентство NASA намерено в течение ближайшего десятилетия послать к Юпитеру беспилотный ядерный корабль Jupiter Icy Moons Orbiter. ... Все ключевые слова . Картинка дня . ...

... xmmtrack . ... xmmtrack is an interactive IDL application that visualizes the orbit and attitude data in an ODF in the form of a 3-D animation sequence. The presented scenery includes an astronomically accurate simulation of the Earth-Sun system plus the actual and predicted trajectory of the XMM satellite on its path around the Earth. ... Please note: XMM's orbit is highly time variable and the predicted orbit will significantly deviate from the actual trajectory if the reference epochs differ. ...

Tail Probe is one of the satellites of the INTERBALL program. ... Collection of the orbital elements | ... Flight situation analysis during operations scheduling . ... Two stages of the orbital situation analysis are presented: . ... The satellites motion calculation during the flight situation analysis is based on the orbital elements, determined by the Ballistic center at KIAM RAN. The modified (by backward integration) orbital elements are usedduring the aposteriory situation analysis. ...

... Currently, there is very little information on comets which are active beyond the orbit of Jupiter. ... Previous observations conducted by our team with the SAO RAS 6-m telescope showed that some of these comets have extended tails dissimilar to the tails of comets forming at close heliocentric distances. ... We for the first time measured the linear polarization of scattered emission for the two distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances of 5.9-7.0 au. ...

The best portrait book of the solar system I have ever seen is Beyond: Visions of the Interplanetary Probes , by Michael Benson, but with so many interesting missions going on at the moment, this is fast becoming outdated. ... Another stunning image from the Cassini spacecraft: The moon Enceladus . ... The seventies were the first golden age of robotic solar system exploration. ... First stop: Pluto and its satellite system . ... The three main categories of Kuiper belt objects known are: . ...

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... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

Collins School Star Party - Oct. 5, 1999 Presented by the North Shore Amateur Astronomy Club (NSAAC) For more information: NSAAC: http://www.star.net/people/~nsaac 1.0 Using a telescope Close one eye (use your hand if it's easier) and look straight down into the eyepiece. ... Massive stars use up their fuel much faster - in some cases less than 100 million years. ... Jupiter _____. ... With the chart at left and using the brightest stars as a guide, see if you can find Uranus with binoculars. ...