PTYS_411_511_7_Lec18-032207_Marsintro

PTYS_411_511_7_Lec18-032207_Marsintro - Introduction to...

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PTYS/ASTR 206 Mars 3/22/07 Introduction to Mars
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PTYS/ASTR 206 Mars 3/22/07 Announcements Reading Assignment Finish Chapter 13 Quiz today Will cover all material since the last exam. This is Chapters 9-12 and the part of 13 covered today. Exam #2 next Thursday Brief review after Tuesday’s lecture Next study-group session is next Wednesday (3/28) from 10:30AM- 12:00Noon – in room 330. Public lecture – next Tuesday (3/27) 7:30PM in 308 of Kuiper (this room). Prof. Bob Brown, “Saturn seen through infrared eyes” Look for PTYS/ASTR206 sign-up sheet (our class!) Note – Prof. Brown will conduct a limited number of special 10- minute tours of the VIMS Operations Center; these tours will originate in the Atrium at 6PM – early arrival is recommended!
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PTYS/ASTR 206 Mars 3/22/07 Today: Basic facts of Mars Mars’s apparitions / orbit / appearance from Earth Exploration Surface (start) Tuesday Surface (finish) Interior Atmosphere Water on Mars Moons Life (time permitting; otherwise, this will be discussed later in the course)
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PTYS/ASTR 206 Mars 3/22/07 Introduction to Mars 4 th planet from the Sun Avg. distance: 1.524 AU Eccentricity: 0.093 Year: 686.98 days Day: 24.62 hours Almost the same (differs only by about ½ hour) Diameter: 6,794 km About ½ the size of Earth Mass: 6.418 x 10 23 kg About 10 times less than Earth Surface temp: Max: 70 o F Min: -220 o F Mean: -63 o F
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Mars 3/22/07 Mars’ Apparitions Mars is best seen from Earth every synodic period. That is every 780 days. During this time, Mars is at opposition and rises to its highest point in the night sky at midnight. During the month or so on either side of this, Mars is bright in the sky and is very obvious also known as an “apparition” Because of Mars’s elliptical orbit, some oppositions are more favorable than
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PTYS_411_511_7_Lec18-032207_Marsintro - Introduction to...

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